All calculators
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The calculators
Acres → square meters
Convert a measurement from ac to m² using an explicit conversion factor.
Unit convertersAdjust a recipe
Adjust an ingredient quantity to the desired number of servings.
Everyday lifeAge on a date
Calculate age in completed years on your chosen date.
Everyday lifeArea of a circle
Calculate the area of a disk from its radius.
MathematicsArea of a rectangle
Calculate the area and perimeter of a rectangle.
MathematicsArea of a triangle
Calculate the area of a triangle using a base and its perpendicular height.
MathematicsAdd days to a date
Find a date a specified number of days later, or earlier using a negative value.
Everyday lifeAdd a percentage
Increase a value by the specified percentage.
MathematicsRunning pace
Convert a time and distance into pace per kilometer.
Everyday lifePermutations
Count ordered selections of k elements from n without repetition.
Education & scienceEstimated driving range
Estimate the theoretical distance you can travel with the available fuel.
Everyday lifeBars → pascals
Convert a measurement from bar to Pa using an explicit conversion factor.
Unit converters50 / 30 / 20 budget
Allocate income using an illustrative budgeting guideline.
Money & financeRenovation budget
Add material costs, labor costs and a contingency allowance.
Home & renovationPercentage calculator
Find a specified percentage of a number.
MathematicsCelsius → Fahrenheit
Convert a temperature from degrees Celsius to degrees Fahrenheit.
Unit convertersCelsius → kelvin
Express a Celsius temperature on the absolute temperature scale.
Unit convertersCentiliters → milliliters
Convert a measurement from cL to mL using an explicit conversion factor.
Unit convertersCentimeters → millimeters
Convert a measurement from cm to mm using an explicit conversion factor.
Unit convertersCircumference of a circle
Calculate the distance around a circle.
MathematicsSlope of a line
Calculate the slope of the line through two points.
Education & scienceCombinations
Count selections of k elements from n without order or repetition.
Education & scienceCommission
Estimate a commission as a percentage of a sales amount.
Money & financeMass concentration
Calculate a concentration from a dissolved mass and the final volume.
Education & scienceFuel consumption
Calculate average fuel consumption from the fuel used and distance traveled.
Everyday lifeElectrical appliance cost
Estimate energy consumption and its cost over a period.
Everyday lifeTrip cost
Estimate fuel and toll costs for a one-way trip.
Everyday lifeWater usage cost
Estimate the variable cost of water using the volume and rate entered.
Home & renovationBattery charging cost
Estimate the energy cost of charging a battery between two levels.
Everyday lifeSubscription costs
Calculate the annual cost of your recurring monthly expenses.
Money & financeDecimal hours → hours and minutes
Convert decimal hours into hours and minutes, rounded to the nearest minute.
Everyday lifeDegrees → radians
Convert a measurement from ° to rad using an explicit conversion factor.
Unit convertersTwo independent events
Calculate the probability that two independent events both occur.
Education & scienceDistance between two points
Calculate the distance in a two-dimensional Cartesian coordinate system.
Education & scienceTravel time
Estimate travel time at a constant average speed.
Everyday lifePopulation standard deviation
Measure dispersion in the same units as the original values.
MathematicsKinetic energy
Calculate an object's translational kinetic energy.
Education & scienceMonthly savings
Estimate savings with deposits at the end of each month and a constant interest rate.
Money & financeLinear equation
Solve an equation of the form ax + b = 0.
MathematicsQuadratic equation
Solve ax² + bx + c = 0 over the real numbers.
MathematicsStatistical range
Calculate the difference between the largest and smallest values.
MathematicsFactorial
Calculate the product of the integers from 1 to n.
Education & scienceForce and acceleration
Calculate a net force from mass and acceleration.
Education & scienceFrequency and period
Convert the frequency of a periodic phenomenon to its period.
Education & scienceImperial gallons → liters
Convert a measurement from UK gal to L using an explicit conversion factor.
Unit convertersUS gallons → liters
Convert a measurement from US gal to L using an explicit conversion factor.
Unit convertersGrams → milligrams
Convert a measurement from g to mg using an explicit conversion factor.
Unit convertersHectares → square meters
Convert a measurement from ha to m² using an explicit conversion factor.
Unit convertersHours → minutes
Convert a measurement from h to min using an explicit conversion factor.
Unit convertersHours as a decimal
Convert hours and minutes into decimal hours.
Everyday lifeCompound interest
Project the value of a principal amount with annual interest compounding.
Money & financeSimple interest
Calculate interest without compounding over a specified period.
Money & financeDays → hours
Convert a measurement from days to h using an explicit conversion factor.
Unit convertersDays between dates
Count the elapsed calendar days between two dates.
Everyday lifeKilocalories → kilojoules
Convert a measurement from kcal to kJ using an explicit conversion factor.
Unit convertersKilograms → grams
Convert a measurement from kg to g using an explicit conversion factor.
Unit convertersKilometers → meters
Convert a measurement from km to m using an explicit conversion factor.
Unit convertersSquare kilometers → hectares
Convert a measurement from km² to ha using an explicit conversion factor.
Unit convertersKilometers/hour → meters/second
Convert a measurement from km/h to m/s using an explicit conversion factor.
Unit convertersKilowatt-hours → joules
Convert a measurement from kWh to J using an explicit conversion factor.
Unit convertersLiters → milliliters
Convert a measurement from L to mL using an explicit conversion factor.
Unit convertersPounds → kilograms
Convert a measurement from lb to kg using an explicit conversion factor.
Unit convertersLogarithm
Calculate a logarithm in your chosen base.
MathematicsOhm's law
Calculate the voltage across an ideal resistor.
Education & scienceFence length
Estimate the perimeter to fence around a rectangular plot.
Home & renovationGross profit and margins
Calculate gross profit, markup and profit margin using prices excluding VAT.
Money & financeGravel mass
Convert a volume of gravel to mass using the density entered.
Home & renovationDensity
Divide mass by the volume it occupies.
Education & scienceMebibytes → gibibytes
Convert a measurement from MiB to GiB using an explicit conversion factor.
Unit convertersMedian
Find the middle value of a sorted series.
MathematicsMegabytes → gigabytes
Convert a measurement from MB to GB using an explicit conversion factor.
Unit convertersLoan payment
Estimate the monthly payment and interest on a fixed-rate amortizing loan.
Money & financeMeters → centimeters
Convert a measurement from m to cm using an explicit conversion factor.
Unit convertersSquare meters → square centimeters
Convert a measurement from m² to cm² using an explicit conversion factor.
Unit convertersCubic meters → liters
Convert a measurement from m³ to L using an explicit conversion factor.
Unit convertersMiles → kilometers
Convert a measurement from mi to km using an explicit conversion factor.
Unit convertersMiles/hour → kilometers/hour
Convert a measurement from mph to km/h using an explicit conversion factor.
Unit convertersMidpoint of a line segment
Find the coordinates of the midpoint between two points.
Education & scienceNautical miles → kilometers
Convert a measurement from NM to km using an explicit conversion factor.
Unit convertersMinutes → seconds
Convert a measurement from min to s using an explicit conversion factor.
Unit convertersArithmetic mean
Calculate the average of a series of numbers.
MathematicsWeighted average
Calculate an average by assigning a weight to each grade.
Education & scienceKnots → kilometers/hour
Convert a measurement from kn to km/h using an explicit conversion factor.
Unit convertersNumber of tiles
Estimate the number of tiles, including your chosen allowance for cutting waste.
Home & renovationNumber of stair risers
Get an arithmetic estimate of the number of risers and the height of each riser.
Home & renovationRequired grade
Find the grade needed on a remaining assessment to reach a target average.
Education & scienceSavings goal
Find the monthly deposit needed to reach a goal, excluding interest.
Money & financeOunces → grams
Convert a measurement from oz to g using an explicit conversion factor.
Unit convertersFlooring to order
Determine the flooring area to order and the number of packages.
Home & renovationPercentage of a total
Express part of a total as a percentage.
MathematicsShared trip costs
Split travel expenses among the participants.
Everyday lifeSlope percentage
Calculate the slope using the elevation change and horizontal distance.
Home & renovationGreatest common divisor
Find the greatest common divisor of two integers.
MathematicsFeet → meters
Convert a measurement from ft to m using an explicit conversion factor.
Unit convertersSquare feet → square meters
Convert a measurement from ft² to m² using an explicit conversion factor.
Unit convertersInches → centimeters
Convert a measurement from in to cm using an explicit conversion factor.
Unit convertersTip and bill split
Add a tip, then split the bill equally.
Money & financeLeast common multiple
Find the least common multiple of two integers.
MathematicsPrice after discount
Calculate a discounted price and the amount saved.
Money & financePrice per kilogram
Compare products of different weights on a per-kilogram basis.
Everyday lifePrice per liter
Find the price per liter from the volume of a container.
Everyday lifeTarget selling price
Determine the price excluding VAT needed to achieve a profit margin based on the selling price.
Money & financePrice excluding VAT → price including VAT
Add VAT to a price excluding tax using your chosen rate.
Money & financePrice including VAT → price excluding VAT
Find the price excluding VAT and the VAT included in a tax-inclusive amount.
Money & financeUnit price
Calculate the cost of one unit from the price of a package.
Money & financeSimple probability
Calculate the probability of an event with equally likely outcomes.
Education & scienceInflation projection
Estimate a future price assuming a hypothetical constant annual increase.
Money & financePSI → bars
Convert a measurement from psi to bar using an explicit conversion factor.
Unit convertersExponentiation
Raise a base to an exponent.
MathematicsDC electrical power
Calculate electrical power from voltage and current.
Education & sciencePaint quantity
Estimate the paint needed using its coverage rate and the number of coats.
Home & renovationSquare root
Find the nonnegative square root of a number.
MathematicsCube root
Find the cube root of a positive or negative number.
MathematicsConvert a grade to a score out of 100
Express a score on a 100-point scale.
Education & scienceConvert a grade to a score out of 20
Convert a grade from any scoring scale into a score out of 20.
Education & scienceProportions
Find a missing value in a proportion using three known values.
MathematicsSuccessive discounts
Apply two successive discounts to the same price.
Money & financeGross rental yield
Compare annual rental income with the total purchase cost entered.
Money & financeIncome after fixed expenses
Subtract fixed expenses and debt payments from your income.
Money & financeReturn on investment
Express the net gain from an investment as a percentage of its initial cost.
Money & financeWallpaper rolls
Estimate the number of rolls from wallpaper strips, without allowing for pattern matching.
Home & renovationWeeks → days
Convert a measurement from weeks to days using an explicit conversion factor.
Unit convertersBreak-even revenue
Estimate the revenue needed to cover fixed costs.
Money & financeSimplify a fraction
Reduce a fraction to its simplest form.
MathematicsSum of a series
Quickly add several positive or negative numbers.
MathematicsSheet area
Calculate the area of a sheet from its dimensions in millimeters.
Home & renovationRoom floor area
Calculate the floor area of a rectangular room and its flooring cost.
Home & renovationWall area
Estimate the wall area of a rectangular room after subtracting openings.
Home & renovationDebt-to-income ratio
Compare monthly debt payments with the monthly income entered.
Money & financeSuccess rate
Divide the number of successes by the total number of attempts.
Education & scienceEquivalent hourly rate
Divide a payment amount by a number of hours.
Money & financeProjected running time
Project a running time based on a constant pace.
Everyday lifeReading time
Estimate reading time from the word count and your reading pace.
Everyday lifeDownload time
Estimate the ideal file transfer time at a constant data rate.
Everyday lifePythagorean theorem
Find the hypotenuse of a right triangle.
MathematicsMetric tons → kilograms
Convert a measurement from t to kg using an explicit conversion factor.
Unit convertersPresent value
Discount a future amount using your chosen annual discount rate.
Money & financeValue before an increase
Find the original value before a known percentage increase.
MathematicsPopulation variance
Calculate the dispersion of a series by dividing by the total number of values.
MathematicsPercentage change
Measure an increase or decrease relative to the initial value.
MathematicsAverage speed
Divide the distance traveled by the total travel time.
Everyday lifeVolume of a cube
Calculate the volume and total surface area of a cube.
MathematicsVolume of a cylinder
Calculate the volume of a right circular cylinder.
MathematicsVolume of a rectangular prism
Calculate the volume of a rectangular solid.
MathematicsSwimming pool volume
Estimate the volume of a rectangular pool using its average depth.
Home & renovationVolume of a sphere
Calculate the volume of a sphere from its radius.
MathematicsConcrete volume
Calculate the geometric volume of a rectangular slab.
Home & renovationSoil volume
Estimate the volume of soil needed for a rectangular area.
Home & renovationWatts → kilowatts
Convert a measurement from W to kW using an explicit conversion factor.
Unit convertersYards → meters
Convert a measurement from yd to m using an explicit conversion factor.
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