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All 350 Tools

THE COMPLETE TOOLKIT

350 tools. Find your next answer.

Health, math, money, home projects, science, conversions, dates and text — all in one place.

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350 tools in 13 categories

Nutrition & energy

8 tools

TDEE Calculator

Find your estimated daily calorie needs.

BMR Calculator

Estimate the energy your body uses at rest.

Calorie Deficit Calculator

Explore a calorie target below maintenance.

Macro Calculator

Turn your calorie split into grams of macros.

Water Intake Calculator

Count your drinks against a target you choose.

Calorie Surplus Calculator

Explore a calorie target above maintenance.

Meal Calorie Calculator

Add up calories and macros, food by food.

Protein Calculator

Calculate grams from your chosen g/kg factor.

Body composition

5 tools

BMI Calculator

Understand your weight-to-height ratio.

Body Fat Calculator

Estimate body fat from tape measurements.

Ideal Weight Calculator

Find the weight interval for an adult BMI range.

Lean Body Mass Calculator

Separate estimated fat mass and fat-free mass.

Waist-to-Height Calculator

Calculate a simple body-proportion ratio.

Training & movement

5 tools

Calories Burned Calculator

Estimate energy used during an activity.

One-Rep Max Calculator

Estimate your 1RM from a completed set.

Running Pace Calculator

Find pace and speed from distance and time.

Race Time Calculator

See a finish time at your chosen pace.

Distance Calculator

Turn speed and duration into distance.

Unit converters

42 tools

Weight Converter

Convert kilograms, pounds and stone.

Calorie & kJ Converter

Switch between food calories and kilojoules.

Length Converter

Convert length between explicitly labeled units.

Area Converter

Convert area between explicitly labeled units.

Volume Converter

Convert volume between explicitly labeled units.

Speed Converter

Convert speed between explicitly labeled units.

Temperature Converter

Convert temperature between explicitly labeled units.

Duration Units Converter

Convert duration units between explicitly labeled units.

Data Size Converter

Convert data size between explicitly labeled units.

Data Transfer Rate Converter

Convert data transfer rate between explicitly labeled units.

Angle Converter

Convert angle between explicitly labeled units.

Frequency Converter

Convert frequency between explicitly labeled units.

Acceleration Converter

Convert acceleration between explicitly labeled units.

Force Converter

Convert force between explicitly labeled units.

Pressure Converter

Convert pressure between explicitly labeled units.

Power Converter

Convert power between explicitly labeled units.

Density Converter

Convert density between explicitly labeled units.

Torque Converter

Convert torque between explicitly labeled units.

Volume Flow Converter

Convert volume flow between explicitly labeled units.

Fuel Economy Converter

Convert fuel economy between explicitly labeled units.

Electric Charge Converter

Convert electric charge between explicitly labeled units.

Electric Current Converter

Convert electric current between explicitly labeled units.

Voltage Converter

Convert voltage between explicitly labeled units.

Electrical Resistance Converter

Convert electrical resistance between explicitly labeled units.

Electrical Conductance Converter

Convert electrical conductance between explicitly labeled units.

Capacitance Converter

Convert capacitance between explicitly labeled units.

Inductance Converter

Convert inductance between explicitly labeled units.

Magnetic Flux Converter

Convert magnetic flux between explicitly labeled units.

Magnetic Flux Density Converter

Convert magnetic flux density between explicitly labeled units.

Illuminance Converter

Convert illuminance between explicitly labeled units.

Luminance Converter

Convert luminance between explicitly labeled units.

Dynamic Viscosity Converter

Convert dynamic viscosity between explicitly labeled units.

Kinematic Viscosity Converter

Convert kinematic viscosity between explicitly labeled units.

Surface Tension Converter

Convert surface tension between explicitly labeled units.

Thermal Conductivity Converter

Convert thermal conductivity between explicitly labeled units.

Specific Heat Capacity Converter

Convert specific heat capacity between explicitly labeled units.

Thermal Resistance Converter

Convert thermal resistance between explicitly labeled units.

Heat Capacity Converter

Convert heat capacity between explicitly labeled units.

Angular Velocity Converter

Convert angular velocity between explicitly labeled units.

Angular Acceleration Converter

Convert angular acceleration between explicitly labeled units.

Mass Flow Converter

Convert mass flow between explicitly labeled units.

Molar Concentration Converter

Convert molar concentration between explicitly labeled units.

Mathematics

45 tools

Percentage of a Number

Calculate a percentage of an amount.

Percentage Change

Measure an increase or decrease from a positive starting value.

Percentage Difference

Compare two positive values symmetrically.

Reverse Percentage

Recover an amount before a percentage increase or decrease.

Ratio Scaling

Split a total according to a two-part ratio.

Fraction Simplifier

Reduce a fraction to its simplest signed form.

Fraction Arithmetic

Add, subtract, multiply or divide two fractions.

Decimal to Fraction

Convert a finite decimal with up to 9 fractional digits to an exact fraction.

Greatest Common Divisor

Find the greatest common divisor of two integers.

Least Common Multiple

Find the smallest nonnegative common multiple.

Prime Number Checker

Check whether an integer is prime, composite or neither.

Factorial Calculator

Calculate an exact integer factorial.

Permutations Calculator

Count ordered selections without replacement.

Combinations Calculator

Count unordered selections without replacement.

Exponent Calculator

Raise a number to a power in the real-number domain.

Nth Root Calculator

Calculate a real nth root; negative radicands require an odd degree.

Logarithm Calculator

Calculate a logarithm using a positive base other than one.

Scientific Notation

Write a number in normalized scientific notation.

Number Rounding

Round a number for display without changing other inputs.

Modulo Calculator

Find a nonnegative remainder for integer division.

Fibonacci Number

Calculate an exact Fibonacci number.

Triangular Number

Count an exact triangular arrangement.

Prime Factorization

Factor an integer into primes.

Integer Divisors

List all positive divisors of an integer.

Digit Sum

Sum the digits of a nonnegative integer.

Digital Root

Reduce a nonnegative decimal integer to its digital root.

Number Base Converter

Convert signed integers using digits 0–9 and letters A–Z.

Roman Numerals

Convert canonical Roman numerals and ordinary integers.

Complex Arithmetic

Calculate with two complex numbers.

Complex Number to Polar

Convert a complex number to magnitude and phase.

Three Linear Equations

Solve a 3×3 real linear system with a unique solution.

Matrix Determinant

Find a determinant for a square matrix up to 6×6.

Matrix Multiplication

Multiply compatible matrices up to 6 rows or columns.

Matrix Transpose

Transpose a matrix with up to 6 rows and columns.

Vector Cross Product

Find the 3D cross product in a right-handed coordinate system.

Vector Magnitude

Calculate the Euclidean norm of a vector.

Angle Between Vectors

Find the angle between equal-length nonzero vectors.

3D Point Distance

Find straight-line distance between two 3D points.

Quadratic Vertex

Find a parabola’s vertex and whether it opens upward or downward.

Percentage Error

Compare a measured value with a nonzero reference.

Discrete Expected Value

Calculate an expectation when probabilities sum to one.

Probability of A or B

Combine consistent event probabilities using their intersection.

Conditional Probability

Calculate a conditional probability from joint and conditioning probabilities.

Pearson Correlation

Measure linear association between paired values, without implying causation.

Simple Linear Regression

Fit a straight line and calculate R² for the entered sample.

Geometry

25 tools

Circle Area

Find the area enclosed by a circle.

Circle Circumference

Find the distance around a circle.

Circular Sector

Find the area and arc length of a circular sector.

Annulus Area

Find the area between two concentric circles.

Ellipse Area

Find the area enclosed by an ellipse.

Rectangle Calculator

Find rectangle area, perimeter and diagonal.

Square Calculator

Find square area, perimeter and diagonal.

Triangle Area

Find triangle area from a base and its height.

Triangle from Three Sides

Find the area of a valid three-sided triangle.

Right Triangle

Find hypotenuse, area and perimeter from two perpendicular legs.

Trapezoid Area

Find area from two parallel sides and their separation.

Parallelogram Area

Find parallelogram area from base and height.

Rhombus Calculator

Find area and perimeter from the two diagonals.

Regular Polygon

Find area, perimeter and apothem of a regular polygon.

Polygon Angles

Find interior and exterior angles of a regular polygon.

Distance Between Two Points

Measure straight-line distance in a 2D coordinate plane.

Midpoint Calculator

Find the midpoint between two 2D points.

Line Slope

Find slope and intercept of a nonvertical line.

Sphere Calculator

Find the volume and surface area of a sphere.

Cylinder Calculator

Find cylinder volume and total surface area, including both ends.

Cone Calculator

Find cone volume, slant height and total surface area.

Cube Calculator

Find cube volume, surface area and space diagonal.

Cuboid Calculator

Find rectangular-box volume and total surface area.

Pyramid Volume

Find the volume of a pyramid with a known base area.

Conical Frustum

Find the volume of a cone with its tip removed.

Statistics & algebra

25 tools

Linear Equation Solver

Solve a first-degree equation for a real x.

Quadratic Equation Solver

Find the real roots and discriminant of a quadratic.

Two Linear Equations

Solve two simultaneous equations with a unique solution.

Arithmetic Sequence

Find the nth term and sum of an arithmetic sequence.

Geometric Sequence

Find the nth term and finite sum of a geometric sequence.

Arithmetic Mean

Find the arithmetic average.

Median

Find the middle of a numeric list.

Mode

Find the most frequent values in a numeric list.

Numeric Range

Find the spread between smallest and largest values.

Variance

Calculate population or sample variance.

Standard Deviation

Calculate population or sample standard deviation.

Geometric Mean

Find the geometric average of positive numbers.

Harmonic Mean

Find the harmonic average of positive numbers.

Root Mean Square

Find the RMS magnitude of a numeric list.

Coefficient of Variation

Measure population variability relative to a positive mean.

Interquartile Range

Find the central spread using linearly interpolated quartiles.

Sum of Numbers

Add a list of positive and negative numbers.

Product of Numbers

Multiply the numbers in a list.

Weighted Mean

Average values using nonnegative weights with a positive total.

Percentile Calculator

Find a selected percentile of a numeric list.

Z-Score Calculator

Express a value in standard-deviation units.

Linear Interpolation

Interpolate or extrapolate along a straight line.

Binomial Probability

Find the probability of exactly k successes in independent trials.

Normal Distribution Density

Evaluate a normal probability density, not an interval probability.

Vector Dot Product

Calculate the dot product of equal-length numeric vectors.

Money & business

55 tools

Discount Calculator

Calculate a discounted price and savings.

Successive Discounts

Apply two discounts in sequence.

Tax Added to a Price

Add a tax rate that you supply.

Pre-tax Price

Separate a tax-inclusive amount into base and tax.

Tip Calculator

Calculate a tip and the resulting total.

Bill Splitter

Split a bill and optional tip equally.

Markup Calculator

Set a sale price from cost and markup.

Profit Margin

Calculate gross profit and its share of revenue.

Break-even Units

Find the whole-unit sales needed to cover stated costs.

Return on Investment

Calculate a simple return from amounts you supply.

Simple Interest

Calculate interest without compounding.

Compound Interest

Explore a fixed-rate compounding scenario.

Loan Payment

Calculate a fixed monthly principal-and-interest payment.

Total Loan Interest

Compare scheduled payments with the amount borrowed.

Savings with Contributions

Model monthly saving at a constant nominal interest rate.

Savings Goal Contribution

Find a monthly contribution for an illustrative savings target.

Present Value

Discount a future amount using your chosen annual rate.

Annuity Present Value

Discount a series of equal end-of-month payments.

Inflation Adjustment

Model a cost under a constant inflation assumption.

Purchasing Power

Express a future nominal amount in today-equivalent units.

Doubling Time

Find exact doubling time for constant annual compound growth.

Annual Salary to Hourly

Convert annual gross pay to an hourly equivalent.

Hourly Pay to Annual

Annualize an hourly rate using your work schedule.

Overtime Pay

Add regular and overtime pay using a multiplier you supply.

Income After Deductions

Subtract a total deduction amount from gross income.

Budget Balance

See what remains after expenses and planned savings.

Savings Rate

Express savings as a percentage of income for the same period.

Unit Price Comparison

Compare two packs measured in the same quantity unit.

Currency at Your Rate

Convert money using an exchange rate you enter; no live quotes.

Annualized Growth Rate

Find the constant annual rate connecting two positive values.

Remaining Loan Balance

Estimate principal remaining on a fixed-rate amortizing loan.

Extra Payment Payoff

Model payoff time with a recurring extra payment; fees and prepayment rules are excluded.

Principal from Monthly Payment

Calculate the principal corresponding to a payment, term and nominal rate.

Effective Annual Rate

Translate a nominal interest rate to an effective annual rate.

Nominal Annual Rate

Find the nominal rate for a chosen compounding frequency.

Real Return

Adjust a nominal return for a supplied inflation rate.

Investment Fee Impact

Compare a constant-growth scenario with and without an annual percentage fee.

Sales Commission

Calculate commission with an optional base payment.

Two-Tier Commission

Apply marginal commission rates to two sales tiers.

Profit from Unit Sales

Calculate profit for a stated unit-sales scenario.

Price for a Target Margin

Find a selling price from cost and a chosen gross margin.

Margin and Markup Converter

Convert between two different definitions of percentage profit.

Inventory Turnover

Calculate inventory turnover for a consistent accounting period.

Inventory Days

Estimate inventory days using your period totals.

Cash Runway

Model cash runway at a constant monthly outflow.

Customer Acquisition Cost

Calculate acquisition cost per new customer.

Simple Customer Lifetime Value

Estimate an undiscounted gross-profit customer lifetime value.

Return on Ad Spend

Measure attributed revenue per unit of advertising spend.

Conversion Rate

Measure a conversion rate when each visit has at most one counted conversion.

Click-Through Rate

Calculate an aggregate click-to-impression ratio.

Cost per Click

Find average campaign spend per click.

Cost per Thousand Impressions

Find advertising cost per thousand impressions.

Project Quote

Combine labor, expenses and a contingency into a quote.

Freelance Day Rate

Find a gross day-rate scenario before taxes or unpaid contingencies.

Monthly vs Annual Subscription

Compare annualized monthly billing with an annual plan.

Dates & time

20 tools

Days Between Dates

Count signed calendar days between two dates.

Add or Subtract Days

Move a date forward or backward by calendar days.

Add or Subtract Months

Move a date by months, with end-of-month clamping.

Add or Subtract Years

Move a date by years, handling leap-day anniversaries.

Day of the Week

Find which weekday a calendar date falls on.

Day of the Year

Find a date’s day number within its year.

Days in a Month

Find a month’s length, including leap-year February.

Leap Year Checker

Check a Gregorian year for its extra February day.

ISO Week Number

Find the ISO week and ISO week-year.

Start of the Week

Find the Monday and Sunday bounding a date’s week.

Last Day of the Month

Find the last calendar date of a month.

Business Days Between Dates

Count weekdays, including the start but excluding the end.

Add Business Days

Move forward or backward by weekdays, ignoring holidays.

Age on a Date

Calculate calendar age between two dates with end-of-month clamping.

Calendar Quarter

Find the calendar quarter and its start and end dates.

Time Between Two Clocks

Count hours and minutes; an earlier end time means the next day.

Add Minutes to a Time

Shift a clock time and show the day offset.

Decimal Hours to Clock

Convert decimal hours to an hours:minutes:seconds duration.

Add Time Durations

Add clock-style durations without wrapping at 24 hours.

Unix Timestamp to Date

Convert a Unix timestamp in seconds to a UTC calendar date and time.

Text & data

50 tools

Word Counter

Count words and lines in text.

Character Counter

Count characters, spaces and UTF-8 bytes.

Uppercase Text

Convert text to uppercase.

Lowercase Text

Convert text to lowercase.

Title Case

Capitalize word starts with a simple Unicode-aware rule.

Sentence Case

Apply a simple sentence-case rule after periods, question marks and exclamation marks.

URL Slug Generator

Create a readable slug while retaining Unicode letters and digits.

Whitespace Cleaner

Tidy spaces and tabs while preserving line breaks.

Remove Line Breaks

Join multi-line text into one line.

Sort Text Lines

Sort lines in a predictable case-sensitive order.

Remove Duplicate Lines

Remove repeated lines while preserving first-seen order.

Reverse Text

Reverse characters without splitting surrogate pairs; combining marks may move.

HTML Escape

Escape text for display as literal HTML characters.

Reading Time

Estimate reading duration at a reading speed you supply.

Find and Replace

Replace repeated text without regular expressions.

URL Component Encoder / Decoder

Encode or decode a single URL component, not a complete URL.

UTF-8 Base64 Encoder / Decoder

Convert Unicode text to and from standard Base64. Encoding is not encryption.

JSON Formatter

Validate and format JSON locally in your browser.

CSV to JSON

Convert comma-delimited CSV with quoted fields into an array of objects.

JSON to CSV

Convert flat JSON records into CSV; nested values are rejected.

JSON Key Extractor

Extract the top-level property names from a JSON object.

JSON Array Sorter

Sort JSON records by one consistently typed property.

JSON Object Merge

Merge two objects without recursively merging nested values.

JSON Flatten to Paths

Flatten nested JSON using escaped JSON Pointer paths.

JSON Pointer Lookup

Extract a nested value using JSON Pointer escapes ~0 and ~1.

Compare JSON

List added, removed and changed JSON paths.

JSON to Query String

Create a query string from a flat object; arrays repeat their key.

Query String to JSON

Convert a query string into a JSON object of strings and arrays.

URL Inspector

Inspect scheme, host, port, path, query and fragment locally.

URL Builder

Build an HTTP URL from a base, path and query object.

Markdown Heading Extractor

List hash-style Markdown headings and their levels.

Markdown Link Extractor

List simple inline Markdown links; reference links and nested parentheses are excluded.

Add Line Numbers

Number lines while preserving their order and content.

Remove Line Numbers

Remove common line-number prefixes.

Line Prefix and Suffix

Wrap each line with text you choose.

Text Indentation

Indent or dedent text without changing internal spaces.

Word Wrap

Reflow each paragraph to a selected character width.

CSV Column Extractor

Extract one CSV column as a JSON array of strings.

CSV Transpose

Transpose a rectangular CSV table.

CSV to Tab or Semicolon

Convert CSV to tab-separated or semicolon-separated data.

CSV Row Filter

Filter CSV records using a case-sensitive exact match.

CSV Row Sorter

Sort a CSV table with explicit numeric or text ordering.

List Intersection

Find exact, case-sensitive shared lines; blank lines are ignored.

List Union

Combine two lists without duplicate nonempty lines.

List Difference

Subtract one list from another using exact nonempty lines.

Word Frequency

Rank word occurrences in a text.

Acronym Maker

Build initials from a phrase; no words are omitted automatically.

Palindrome Checker

Check a Unicode-aware normalized palindrome.

Anagram Checker

Check whether two normalized texts are anagrams.

HEX Color Values

Read RGB, HSL and relative luminance for an opaque HEX color.

Home & projects

25 tools

Paint Quantity

Estimate paint volume using the product’s stated coverage.

Wallpaper Rolls

Estimate rolls for full-height vertical strips; pattern matching is excluded.

Tile Boxes

Estimate whole tiles and boxes for a measured area.

Flooring Packs

Estimate flooring packs, including your waste allowance.

Concrete Volume

Estimate material volume for a rectangular slab.

Gravel Mass

Convert a gravel layer volume to mass using your density.

Planter Soil Bags

Estimate soil volume and whole bags for rectangular planters.

Circular Garden Border

Estimate edging pieces around a circular bed.

Brick Face Count

Estimate face brick count; wall thickness and structural details are excluded.

Fence Post Count

Count posts and sections for a simple fence layout.

Even Post Spacing

Distribute a fixed number of posts evenly along a run.

Stair Dimensions

Calculate geometry for a chosen stair layout, without code assessment.

Ground Gradient

Express a ground slope as a percentage and angle.

Pitched Roof Area

Estimate area for a uniform roof pitch from its horizontal projection.

Curtain Fabric Length

Estimate fabric length from whole widths and a chosen fullness.

Fabric Cost

Price a length of fabric with an extra allowance.

Space Planning Count

Divide an area by your own space allocation; this is not a legal occupancy limit.

Ventilation Flow from Air Changes

Translate a supplied air-change rate into volumetric flow.

Water Heating Energy

Estimate sensible heating energy using 1 kg/L water and 4184 J/(kg·K).

Water Cost Estimate

Calculate a simple water charge using supplied rates.

Appliance Electricity Cost

Estimate an appliance’s electricity use and cost.

Battery Runtime

Estimate runtime from energy capacity and a constant power draw.

Appliance Energy Savings

Compare stated power use and a simple energy-only payback.

Solar Energy Scenario

Estimate production using sun-hour and performance assumptions you supply.

Rainwater Capture

Estimate collected rainwater from a measured rainfall event.

Science & engineering

30 tools

Force from Mass and Acceleration

Calculate net force from mass and acceleration.

Kinetic Energy

Calculate translational kinetic energy.

Gravitational Potential Energy

Calculate a potential-energy difference in a uniform gravity field.

Linear Momentum

Calculate one-dimensional linear momentum.

Impulse from Force

Calculate impulse for a constant force.

Mechanical Work

Calculate work from force, distance and their angle.

Power from Work

Calculate average power from work and duration.

Density from Mass and Volume

Calculate density from mass and volume.

Pressure from Force and Area

Calculate uniform pressure from normal force and area.

Hydrostatic Pressure

Calculate liquid gauge pressure at a depth, excluding atmospheric pressure.

Buoyant Force

Calculate Archimedes’ buoyant force.

Spring Force

Calculate the restoring force of an ideal linear spring.

Spring Potential Energy

Calculate stored energy in an ideal spring.

Centripetal Acceleration

Calculate inward acceleration for uniform circular motion.

Centripetal Force

Calculate force needed for uniform circular motion.

Gravitational Attraction

Calculate Newtonian attraction for point masses or nonoverlapping spherical masses.

Ideal Free Fall

Calculate a drop from rest without air resistance.

Ideal Projectile Motion

Calculate range, flight time and peak height for level-ground ideal motion.

Wave Speed

Calculate wave speed from frequency and wavelength.

Wave Period

Calculate the time for one wave cycle.

Ohm’s Law Voltage

Calculate voltage across an ideal resistor.

DC Electrical Power

Calculate signed DC power from voltage and current.

Series Resistance

Combine positive ideal resistors in series.

Parallel Resistance

Combine positive ideal resistors in parallel.

Series Capacitance

Combine positive ideal capacitors in series.

Parallel Capacitance

Combine positive ideal capacitors in parallel.

RC Time Constant

Calculate the time constant of a simple RC circuit.

Unloaded Voltage Divider

Calculate an ideal divider output with no connected load.

Joule Heating

Calculate ideal resistive heating energy for constant current.

Energy Conversion Efficiency

Calculate an energy-conversion efficiency from consistent totals.

Planning & everyday

15 tools

Weighted Grade

Combine grades using nonnegative weights.

Required Final Exam Grade

Find the exam grade needed for a target course average.

Study Time Planner

Distribute an estimated study workload across available days.

Pomodoro Session Duration

Calculate a session’s total focus and break time.

Reading Plan

Split remaining pages into a daily reading target.

Typing Speed

Estimate typing speed using five characters per standard word.

Meeting Cost

Estimate time cost using an average hourly amount.

Event Budget

Combine per-person and fixed event expenses.

Recipe Ingredient Scaling

Scale manually entered ingredient quantities; cooking time is not scaled.

Round Pan Size Scaling

Scale a round-pan recipe by area, assuming the same batter depth.

Batch Portion Count

Divide a prepared batch into equal whole portions and remainder.

Travel Time with Stops

Estimate elapsed travel time from a supplied speed and stops.

Fuel Trip Cost

Estimate trip fuel and cost using rates you enter.

Fixed Time Offset Converter

Convert using fixed offsets you supply; daylight-saving rules are not inferred.

Shared Time Window

Find the common window across same-day 24-hour availability intervals.