Index
All 205 calculators
Every tool, grouped by what you are trying to work out. Each one shows its formula and its assumptions.
Financial
Loan CalculatorMonthly instalment, total interest and total repayment for any loan.
Compound InterestFuture value of a lump sum with monthly, quarterly or annual compounding.
Savings GoalThe monthly deposit needed to reach a target amount by a date.
Inflation CalculatorWhat an amount will cost in future, and what today’s money buys later.
Mortgage CalculatorHome loan payment with down payment and total interest.
Auto Loan CalculatorCar payment, total interest and depreciation-adjusted cost.
Credit Card PayoffMonths to clear a balance at a fixed monthly payment.
Retirement CalculatorCorpus needed and the monthly saving to reach it.
ROI CalculatorReturn on investment as a percentage and annualised.
CAGR CalculatorCompound annual growth rate between two values.
Commission CalculatorSales commission and take-home on a deal.
Depreciation CalculatorStraight-line and reducing-balance value over time.
Overtime PayOvertime earnings at 1.5× and 2× rates.
Down PaymentDeposit needed and the loan it leaves.
APR CalculatorTrue annual cost including fees.
Debt-to-IncomeMonthly debt against monthly income.
Emergency FundMonths of expenses to keep liquid.
Rent AffordabilityRent you can carry on a given income.
Salary IncrementNew salary and percentage change.
GratuityEnd-of-service benefit (30 days per year).
Lease vs BuyRough monthly cost comparison.
Real SalarySalary after inflation over time.
Savings InterestInterest earned on a deposit at a simple rate.
Dividend YieldYield on cost and on current price.
Card Fee on Foreign SpendWhat a foreign transaction really costs.
Health & fitness
BMI CalculatorBody mass index with the WHO category and healthy weight range.
Calorie NeedsBMR and daily calories with an activity multiplier (Mifflin-St Jeor).
Body FatBody fat percentage with the US Navy tape method.
Ideal WeightHealthy weight range and BMI-based targets for your height.
Water IntakeDaily water target from weight and activity.
Heart Rate ZonesTraining zones from age, using the Fox formula.
Pregnancy Due DateEstimated delivery date from the last menstrual period.
Macro SplitProtein, carbs and fat grams for a calorie target.
Protein NeedsDaily protein target by weight and training goal.
Sleep DebtHow many hours you owe from a week of short sleep.
Lean Body MassLean mass from weight and body fat %
Waist-to-Hip RatioCardiometabolic risk screen.
Waist-to-HeightA better screen than BMI for central fat.
Calories BurnedEnergy burned by activity and time (MET).
One Rep MaxEstimated 1RM from a set (Epley).
Pace CalculatorPace and speed from distance and time.
Steps to KMDistance from steps and stride length.
Pregnancy WeekWeeks and trimester from the last period.
Ovulation WindowLikely fertile days from cycle length.
Body Surface AreaBSA by Du Bois (dosing, burns).
Math
Percentage CalculatorX% of Y, what percent X is of Y, and percentage increase or decrease.
Triangle CalculatorArea, perimeter and type from three sides (Heron’s formula).
Circle CalculatorArea, circumference and diameter from one value.
Rectangle AreaWidth and height to area, perimeter and diagonal.
Square CalculatorSide to area, perimeter and diagonal.
Triangle AreaBase and height to area.
ParallelogramBase and height to area, plus perimeter from the slant side.
Trapezoid AreaTwo parallel sides and the height between them.
Circle AreaRadius to area, circumference and diameter.
Ellipse AreaTwo semi-axes to area and approximate perimeter.
CubeSide to volume, surface area and diagonals.
CylinderRadius and height to volume and surface area.
SphereRadius to volume and surface area.
Fraction to DecimalConvert a fraction to a decimal and percentage.
Ratio CalculatorSimplify a ratio and split an amount by it.
GCD and LCMGreatest common divisor and least common multiple of two numbers.
Prime Number CheckTest whether a number is prime and find nearby primes.
Factorial Calculatorn! for any number up to 170.
Square RootPrincipal square root, plus cube and nth root.
Exponent CalculatorPowers and roots with any base and exponent.
Average CalculatorMean of up to six numbers, with sum and count.
Percentage ChangeIncrease or decrease between two values.
Slope CalculatorSlope and intercept between two points.
Pythagorean TheoremMissing side of a right triangle.
Percent OfX% of a number.
Percent OffSale price after a discount.
Percent IncreaseNew value after a percentage increase.
Percent DecreaseNew value after a percentage decrease.
Percent DifferenceDifference between two values as a percentage.
X is What Percent of YShare of one number in another.
Reverse PercentageOriginal value before a percentage change.
Percentage PointsDifference between two percentages.
LCM CalculatorLeast common multiple of two numbers.
Log CalculatorLogarithm to any base.
Quadratic SolverRoots of ax² + bx + c.
Standard DeviationSpread of up to five values.
PermutationnPr — ordered selections.
CombinationnCr — unordered selections.
Arithmetic Sequencenth term and sum.
Geometric Sequencenth term and sum of a GP.
Distance Between PointsEuclidean distance on a plane.
Scientific NotationConvert to and from scientific notation.
Random NumberA random integer in a range.
Dice RollerRoll dice and see the average.
Everyday
Age CalculatorExact age in years, months and days on any date.
Date DifferenceDays, weeks and working days between two dates.
Tip CalculatorTip amount, total bill and per-person split.
Discount CalculatorSale price, savings and effective discount after tax.
Length ConverterConvert between 9 units with exact factors.
Weight ConverterConvert between 7 units with exact factors.
Area ConverterConvert between 8 units with exact factors.
Volume ConverterConvert between 10 units with exact factors.
Speed ConverterConvert between 5 units with exact factors.
Time ConverterConvert between 7 units with exact factors.
Data Storage ConverterConvert between 6 units with exact factors.
Pressure ConverterConvert between 6 units with exact factors.
Energy ConverterConvert between 7 units with exact factors.
Power ConverterConvert between 5 units with exact factors.
Angle ConverterConvert between 5 units with exact factors.
Fuel Economy ConverterConvert between 3 units with exact factors.
Date Add / SubtractAdd days, weeks or months to a date.
Days UntilDays remaining until a date.
Unit PriceWhich pack is actually cheaper per unit.
Fuel CostTrip fuel and cost from distance and mileage.
Electricity CostMonthly bill from appliance wattage and hours.
GPA CalculatorWeighted GPA from up to four courses.
Grade NeededScore required on the final to hit a target grade.
Test ScorePercentage, grade letter and marks lost.
CountdownWeeks, days and hours to an event.
CM to InchesConvert cm to inches.
Inches to CMConvert inches to cm.
Meters to FeetConvert m to ft.
Feet to MetersConvert ft to m.
KM to MilesConvert km to mi.
Miles to KMConvert mi to km.
MM to InchesConvert mm to in.
Inches to MMConvert in to mm.
Yards to MetersConvert yd to m.
KG to LBSConvert kg to lb.
LBS to KGConvert lb to kg.
Grams to OuncesConvert g to oz.
Ounces to GramsConvert oz to g.
Stone to KGConvert st to kg.
Liters to GallonsConvert L to gal.
Gallons to LitersConvert gal to L.
ML to OZConvert mL to fl oz.
OZ to MLConvert fl oz to mL.
KM/H to MPHConvert km/h to mph.
MPH to KM/HConvert mph to km/h.
MB to GBConvert MB to GB.
GB to MBConvert GB to MB.
PSI to BarConvert psi to bar.
Bar to PSIConvert bar to psi.
Kcal to KJConvert kcal to kJ.
KW to HPConvert kW to hp.
Feet to InchesConvert ft to in.
Inches to FeetConvert in to ft.
Acres to Sq FtConvert ac to sqft.
Sq Ft to Sq MConvert sqft to sqm.
Sq M to Sq FtConvert sqm to sqft.
Knots to KM/HConvert kn to km/h.
HP to KWConvert hp to kW.
Joules to CaloriesConvert J to cal.
Days to HoursConvert d to h.
Hours to MinutesConvert h to min.
Weeks to DaysConvert wk to d.
Years to DaysConvert yr to d.
Hours WorkedHours and pay from clock times.
Time DurationHours and minutes between two times.
Bedtime CalculatorWhen to sleep for a wake time (90-min cycles).
Cooking ConversionCups to ml, tbsp and oz.
Oven TemperatureCelsius, Fahrenheit and gas mark.
Week NumberISO week number for a date.
Business DaysWorking days between two dates.
Zodiac SignStar sign from a birth date.
Days Between DatesSimple day count between two dates.
Password StrengthEntropy estimate for a password length.
Home & construction
Paint CalculatorLitres of paint for walls and ceilings, by coats and coverage.
Tile CalculatorTiles and boxes needed, with cutting wastage.
Concrete CalculatorCement bags, sand and crush for a slab by mix ratio.
Brick CalculatorBricks and mortar for 4.5-inch and 9-inch walls.
Roof AreaSloped roof area from footprint and pitch.
Wallpaper CalculatorRolls needed from room dimensions and pattern repeat.
Gravel CalculatorTonnes of gravel for a driveway or path.
Mulch CalculatorBags of mulch for a bed at a given depth.
Sod CalculatorRolls of sod for a lawn area.
Fence CalculatorPosts, rails and panels for a fence run.
Decking CalculatorBoards and joists for a deck.
Drywall CalculatorSheets and screws for walls and ceilings.
Insulation CalculatorRolls or batts for an attic or wall.
Construction CostBuild cost from area and rate per sqft.
Marla to Square FeetConvert marla, kanal and square feet.
Flooring CalculatorPlanks, sqft and waste for a floor.
Plaster CalculatorCement and sand for plastering.
Tile AdhesiveBags of adhesive for an area.
Rebar WeightWeight of steel bars by diameter and length.
Excavation VolumeSoil to remove for a foundation.
Water Tank SizeLitres in a rectangular tank.
AC TonnageCooling capacity needed for a room.
Paint CoverageLitres needed for a given area.
Business
GST CalculatorAdd or remove GST at any rate, with base and tax split.
Profit & MarginProfit, margin and markup from cost and selling price.
Break-evenUnits and revenue needed to cover fixed costs.
Salary to HourlyConvert salary to hourly, daily and monthly — and back.
Markup CalculatorSelling price from cost and desired markup.
VAT CalculatorAdd or extract VAT at any rate.
Invoice TotalLine total, discount and tax for an invoice.
Payroll CostEmployer cost including contributions.
Shipping CostFreight cost by weight and rate per kg.
Stacked DiscountsReal total discount when two offers stack.
Payment Due DateDue date from invoice date and payment terms.
Freelance Hourly RateRate that covers costs, tax and unpaid time.
Gross ProfitRevenue minus cost of goods.
Net ProfitProfit after all expenses.
Inventory TurnoverHow many times stock sells per year.
Customer Lifetime ValueValue of a customer over their life.
Customer Acquisition CostSpend per new customer.
COGSCost of goods from unit cost and quantity.
Cash FlowMoney in minus money out.
Discount ImpactVolume needed to keep the same profit.