150 Free Calculators
150 calculators. 10 topics.
Choose a topic or search for the calculation you need.
150 calculators in 10 categories
Health & sport
15 calculatorsBMI Calculator
Understand your weight-to-height ratio.
Calculate now 002TDEE Calculator
Find your estimated daily calorie needs.
Calculate now 003BMR Calculator
Estimate the energy your body uses at rest.
Calculate now 004Body Fat Calculator
Estimate body fat from tape measurements.
Calculate now 005Lean Body Mass Calculator
Separate estimated fat mass and fat-free mass.
Calculate now 006Waist-to-Height Calculator
Calculate a simple body-proportion ratio.
Calculate now 007Calorie Deficit Calculator
Explore a calorie target below maintenance.
Calculate now 008Calorie Surplus Calculator
Explore a calorie target above maintenance.
Calculate now 009Macro Calculator
Turn your calorie split into grams of macros.
Calculate now 010Protein Calculator
Calculate grams from your chosen g/kg factor.
Calculate now 011Meal Calorie Calculator
Add up calories and macros, food by food.
Calculate now 012Calories Burned Calculator
Estimate energy used during an activity.
Calculate now 013One-Rep Max Calculator
Estimate your 1RM from a completed set.
Calculate now 014Running Pace Calculator
Find pace and speed from distance and time.
Calculate now 015Race Time Calculator
See a finish time at your chosen pace.
Calculate nowMathematics
15 calculatorsPercentage of a Number
Calculate a percentage of an amount.
Calculate now 017Percentage Change
Measure an increase or decrease from a positive starting value.
Calculate now 018Percentage Difference
Compare two positive values symmetrically.
Calculate now 019Reverse Percentage
Recover an amount before a percentage increase or decrease.
Calculate now 020Ratio Scaling
Split a total according to a two-part ratio.
Calculate now 021Fraction Simplifier
Reduce a fraction to its simplest signed form.
Calculate now 022Fraction Arithmetic
Add, subtract, multiply or divide two fractions.
Calculate now 023Decimal to Fraction
Convert a finite decimal with up to 9 fractional digits to an exact fraction.
Calculate now 024Greatest Common Divisor
Find the greatest common divisor of two integers.
Calculate now 025Least Common Multiple
Find the smallest nonnegative common multiple.
Calculate now 026Factorial Calculator
Calculate an exact integer factorial.
Calculate now 027Permutations Calculator
Count ordered selections without replacement.
Calculate now 028Combinations Calculator
Count unordered selections without replacement.
Calculate now 029Exponent Calculator
Raise a number to a power in the real-number domain.
Calculate now 030Nth Root Calculator
Calculate a real nth root; negative radicands require an odd degree.
Calculate nowGeometry
15 calculatorsCircle Area
Find the area enclosed by a circle.
Calculate now 032Circle Circumference
Find the distance around a circle.
Calculate now 033Ellipse Area
Find the area enclosed by an ellipse.
Calculate now 034Annulus Area
Find the area between two concentric circles.
Calculate now 035Circular Sector
Find the area and arc length of a circular sector.
Calculate now 036Rectangle Calculator
Find rectangle area, perimeter and diagonal.
Calculate now 037Square Calculator
Find square area, perimeter and diagonal.
Calculate now 038Triangle Area
Find triangle area from a base and its height.
Calculate now 039Triangle from Three Sides
Find the area of a valid three-sided triangle.
Calculate now 040Right Triangle
Find hypotenuse, area and perimeter from two perpendicular legs.
Calculate now 041Trapezoid Area
Find area from two parallel sides and their separation.
Calculate now 042Parallelogram Area
Find parallelogram area from base and height.
Calculate now 043Sphere Calculator
Find the volume and surface area of a sphere.
Calculate now 044Cylinder Calculator
Find cylinder volume and total surface area, including both ends.
Calculate now 045Cone Calculator
Find cone volume, slant height and total surface area.
Calculate nowStatistics & probability
15 calculatorsArithmetic Mean
Find the arithmetic average.
Calculate now 047Median
Find the middle of a numeric list.
Calculate now 048Mode
Find the most frequent values in a numeric list.
Calculate now 049Variance
Calculate population or sample variance.
Calculate now 050Standard Deviation
Calculate population or sample standard deviation.
Calculate now 051Geometric Mean
Find the geometric average of positive numbers.
Calculate now 052Weighted Mean
Average values using nonnegative weights with a positive total.
Calculate now 053Percentile Calculator
Find a selected percentile of a numeric list.
Calculate now 054Interquartile Range
Find the central spread using linearly interpolated quartiles.
Calculate now 055Z-Score Calculator
Express a value in standard-deviation units.
Calculate now 056Binomial Probability
Find the probability of exactly k successes in independent trials.
Calculate now 057Pearson Correlation
Measure linear association between paired values, without implying causation.
Calculate now 058Simple Linear Regression
Fit a straight line and calculate R² for the entered sample.
Calculate now 059Discrete Expected Value
Calculate an expectation when probabilities sum to one.
Calculate now 060Conditional Probability
Calculate a conditional probability from joint and conditioning probabilities.
Calculate nowLoans & savings
15 calculatorsLoan Payment
Calculate a fixed monthly principal-and-interest payment.
Calculate now 062Remaining Loan Balance
Estimate principal remaining on a fixed-rate amortizing loan.
Calculate now 063Total Loan Interest
Compare scheduled payments with the amount borrowed.
Calculate now 064Extra Payment Payoff
Model payoff time with a recurring extra payment; fees and prepayment rules are excluded.
Calculate now 065Principal from Monthly Payment
Calculate the principal corresponding to a payment, term and nominal rate.
Calculate now 066Simple Interest
Calculate interest without compounding.
Calculate now 067Compound Interest
Explore a fixed-rate compounding scenario.
Calculate now 068Savings with Contributions
Model monthly saving at a constant nominal interest rate.
Calculate now 069Savings Goal Contribution
Find a monthly contribution for an illustrative savings target.
Calculate now 070Present Value
Discount a future amount using your chosen annual rate.
Calculate now 071Annuity Present Value
Discount a series of equal end-of-month payments.
Calculate now 072Effective Annual Rate
Translate a nominal interest rate to an effective annual rate.
Calculate now 073Nominal Annual Rate
Find the nominal rate for a chosen compounding frequency.
Calculate now 074Inflation Adjustment
Model a cost under a constant inflation assumption.
Calculate now 075Investment Fee Impact
Compare a constant-growth scenario with and without an annual percentage fee.
Calculate nowBusiness & marketing
15 calculatorsProfit Margin
Calculate gross profit and its share of revenue.
Calculate now 077Price for a Target Margin
Find a selling price from cost and a chosen gross margin.
Calculate now 078Break-even Units
Find the whole-unit sales needed to cover stated costs.
Calculate now 079Profit from Unit Sales
Calculate profit for a stated unit-sales scenario.
Calculate now 080Sales Commission
Calculate commission with an optional base payment.
Calculate now 081Inventory Turnover
Calculate inventory turnover for a consistent accounting period.
Calculate now 082Inventory Days
Estimate inventory days using your period totals.
Calculate now 083Customer Acquisition Cost
Calculate acquisition cost per new customer.
Calculate now 084Simple Customer Lifetime Value
Estimate an undiscounted gross-profit customer lifetime value.
Calculate now 085Return on Ad Spend
Measure attributed revenue per unit of advertising spend.
Calculate now 086Conversion Rate
Measure a conversion rate when each visit has at most one counted conversion.
Calculate now 087Click-Through Rate
Calculate an aggregate click-to-impression ratio.
Calculate now 088Cost per Click
Find average campaign spend per click.
Calculate now 089Cost per Thousand Impressions
Find advertising cost per thousand impressions.
Calculate now 090Project Quote
Combine labor, expenses and a contingency into a quote.
Calculate nowDates & durations
15 calculatorsDays Between Dates
Count signed calendar days between two dates.
Calculate now 092Add or Subtract Days
Move a date forward or backward by calendar days.
Calculate now 093Add or Subtract Months
Move a date by months, with end-of-month clamping.
Calculate now 094Add or Subtract Years
Move a date by years, handling leap-day anniversaries.
Calculate now 095Business Days Between Dates
Count weekdays, including the start but excluding the end.
Calculate now 096Add Business Days
Move forward or backward by weekdays, ignoring holidays.
Calculate now 097Age on a Date
Calculate calendar age between two dates with end-of-month clamping.
Calculate now 098Day of the Year
Find a date’s day number within its year.
Calculate now 099Days in a Month
Find a month’s length, including leap-year February.
Calculate now 100ISO Week Number
Find the ISO week and ISO week-year.
Calculate now 101Last Day of the Month
Find the last calendar date of a month.
Calculate now 102Time Between Two Clocks
Count hours and minutes; an earlier end time means the next day.
Calculate now 103Add Minutes to a Time
Shift a clock time and show the day offset.
Calculate now 104Decimal Hours to Clock
Convert decimal hours to an hours:minutes:seconds duration.
Calculate now 105Add Time Durations
Add clock-style durations without wrapping at 24 hours.
Calculate nowHome & projects
15 calculatorsPaint Quantity
Estimate paint volume using the product’s stated coverage.
Calculate now 107Tile Boxes
Estimate whole tiles and boxes for a measured area.
Calculate now 108Flooring Packs
Estimate flooring packs, including your waste allowance.
Calculate now 109Concrete Volume
Estimate material volume for a rectangular slab.
Calculate now 110Gravel Mass
Convert a gravel layer volume to mass using your density.
Calculate now 111Planter Soil Bags
Estimate soil volume and whole bags for rectangular planters.
Calculate now 112Brick Face Count
Estimate face brick count; wall thickness and structural details are excluded.
Calculate now 113Fence Post Count
Count posts and sections for a simple fence layout.
Calculate now 114Even Post Spacing
Distribute a fixed number of posts evenly along a run.
Calculate now 115Stair Dimensions
Calculate geometry for a chosen stair layout, without code assessment.
Calculate now 116Pitched Roof Area
Estimate area for a uniform roof pitch from its horizontal projection.
Calculate now 117Curtain Fabric Length
Estimate fabric length from whole widths and a chosen fullness.
Calculate now 118Ventilation Flow from Air Changes
Translate a supplied air-change rate into volumetric flow.
Calculate now 119Water Cost Estimate
Calculate a simple water charge using supplied rates.
Calculate now 120Appliance Electricity Cost
Estimate an appliance’s electricity use and cost.
Calculate nowPhysics & electricity
15 calculatorsForce from Mass and Acceleration
Calculate net force from mass and acceleration.
Calculate now 122Kinetic Energy
Calculate translational kinetic energy.
Calculate now 123Gravitational Potential Energy
Calculate a potential-energy difference in a uniform gravity field.
Calculate now 124Linear Momentum
Calculate one-dimensional linear momentum.
Calculate now 125Mechanical Work
Calculate work from force, distance and their angle.
Calculate now 126Power from Work
Calculate average power from work and duration.
Calculate now 127Density from Mass and Volume
Calculate density from mass and volume.
Calculate now 128Pressure from Force and Area
Calculate uniform pressure from normal force and area.
Calculate now 129Ideal Free Fall
Calculate a drop from rest without air resistance.
Calculate now 130Ideal Projectile Motion
Calculate range, flight time and peak height for level-ground ideal motion.
Calculate now 131Wave Speed
Calculate wave speed from frequency and wavelength.
Calculate now 132Ohm’s Law Voltage
Calculate voltage across an ideal resistor.
Calculate now 133DC Electrical Power
Calculate signed DC power from voltage and current.
Calculate now 134Series Resistance
Combine positive ideal resistors in series.
Calculate now 135Parallel Resistance
Combine positive ideal resistors in parallel.
Calculate nowStudy & everyday life
15 calculatorsWeighted Grade
Combine grades using nonnegative weights.
Calculate now 137Required Final Exam Grade
Find the exam grade needed for a target course average.
Calculate now 138Study Time Planner
Distribute an estimated study workload across available days.
Calculate now 139Pomodoro Session Duration
Calculate a session’s total focus and break time.
Calculate now 140Reading Plan
Split remaining pages into a daily reading target.
Calculate now 141Typing Speed
Estimate typing speed using five characters per standard word.
Calculate now 142Meeting Cost
Estimate time cost using an average hourly amount.
Calculate now 143Event Budget
Combine per-person and fixed event expenses.
Calculate now 144Recipe Ingredient Scaling
Scale manually entered ingredient quantities; cooking time is not scaled.
Calculate now 145Round Pan Size Scaling
Scale a round-pan recipe by area, assuming the same batter depth.
Calculate now 146Batch Portion Count
Divide a prepared batch into equal whole portions and remainder.
Calculate now 147Travel Time with Stops
Estimate elapsed travel time from a supplied speed and stops.
Calculate now 148Fuel Trip Cost
Estimate trip fuel and cost using rates you enter.
Calculate now 149Fixed Time Offset Converter
Convert using fixed offsets you supply; daylight-saving rules are not inferred.
Calculate now 150Shared Time Window
Find the common window across same-day 24-hour availability intervals.
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