All calculators
Every calculator on the site, grouped by category.
Finance
MortgageMonthly payment & amortizationLoanRepayment schedule & total interestCompound InterestGrowth of savings over timeSavingsReach a savings goal50/30/20 BudgetNeeds, wants and savingsInflationWhat an amount is worth in another month, by CPIROIReturn on investment and annualized return403(b)Project your 403(b) balance with IRS limitsTSPProject your Thrift Savings Plan balanceRetirement WithdrawalHow long your savings last with yearly withdrawalsMarkupMarkup and margin from cost and priceCDInterest and balance of a certificate of depositDividendDividend income and reinvestment projectionDollar Cost AveragingAverage cost per share when investing regularly457(b)Project your 457(b) balance with IRS limits401(k) MatchEmployer match and money left on the tableCost BasisAverage cost per share and gain or loss on a sale529 College SavingsProject a 529 balance against future college costsCar PaymentMonthly car payment with tax, down payment and trade-inRefinanceMonthly saving and break-even of a refinanceHome Sale ProceedsNet proceeds from selling a houseAPRAnnual percentage rate with fees countedLoan RecastNew payment after a lump-sum recastPMIPrivate mortgage insurance cost and removalLine of Credit InterestInterest and payoff time on a line of creditSolar LoanMonthly payment and interest on a solar loan.
Tax & Pay
Sales TaxTax and total for any priceMileage Reimbursement2026 IRS mileage rates for business and moreSalary to HourlyConvert pay between periodsOvertimeWeekly pay with time-and-a-half overtimeBonus TaxTax withheld from a bonus and the net amountEffective Tax Rate2026 federal tax, effective and marginal rate
Construction & Home
GravelTons & cubic yards for drivewaysConcreteCubic yards, bags & cost estimateMulchCubic yards for garden bedsAsphaltTons for pavingPaver BaseSand & stone baseTileTiles and boxes for floors and wallsRoof PitchPitch, angle and slopeCubic YardVolume in cubic yardsBaseboardTrim length and piecesWatt-HourBattery energy and runtimePlant SpacingPlants per bedMortarBags for blocks and bricksAC SizeBTU for a room air conditionerPool SaltSalt to add to a poolBoard FootLumber volume in board feetBrickBricks for a wallPlywoodSheets of plywood neededRoofingSquares and shingle bundlesWatts to AmpsConvert watts and ampsLED ResistorSeries resistor for an LEDPool VolumeGallons and liters in a poolRainwater HarvestingRainwater collected from a roofPotting SoilPotting mix for potsCubic InchVolume and conversionsCFMAirflow for a room or ductExterior PaintGallons for a houseBattery RuntimeHow long a battery bank runs a load.Solar Panel AngleBest tilt and direction for fixed solar panels.Solar Panel OutputkWh per day, month and year from your panels.Battery Charge TimeHours to charge a battery from a charger or solar.UPS RuntimeBackup minutes and the VA size to buy.Solar Battery BankSize a battery bank in Ah and battery count.Inverter SizeContinuous and surge watts for your loads.Solar System SizeArray size in kW and panels for your usage.Solar Panel CostCost range from system size and price per watt.Solar PaybackYears for solar savings to repay the cost.Off-Grid SolarSize panels, batteries and inverter from your loads.SandCubic yards and tons of sandStoneLandscape rock by weightSquare FootageArea of rooms and lotsFlooringSquare feet, boxes and cost for a roomLinear FeetTotal length of boards, trim or fencingAcreageAcres and hectares of a lot or fieldRafter LengthCommon rafter length from span and pitchWall StudsStuds and plates for a framed wall
Health & Fitness
Fat IntakeDaily fat range in gramsFiber IntakeDaily fiber goalAdjusted AgeCorrected age for preemiesWeight Loss PercentagePercent of body weight lostMax Heart RateMaximum heart rate by ageBMIBody mass index with health rangesCalorieDaily energy needsBody FatEstimate body fat percentageFFMIFat-free mass index from height and body fatSteps to CaloriesCalories burned walking from your stepsMacroProtein, carbs and fat in gramsBreastfeeding CaloriesDaily calories while nursingPaceRunning pace, time and distance
Math & Statistics
Coefficient of VariationCV as a percentage of the meanExpected ValueMean of a discrete distributionT-TestOne, two-sample and pairedIQRQuartiles and outliersStandard ErrorSE of the mean and confidence intervalPercent ErrorError against an accepted valueCohen's dEffect size for two groupsMultiplying PolynomialsExpand the product of two polynomialsZeros of a FunctionReal and complex zeros of a polynomialSlopeSlope, equation and distance between two pointsSquare RootSquare and nth roots, with simplified radicalsDecimalExact decimal addition, subtraction, multiplication and divisionCylinder VolumeVolume and surface area of a cylinderInterval NotationConvert inequalities and interval notationPythagorean TheoremHypotenuse or missing leg of a right triangleInverse TangentArctan and atan2 in degrees and radiansGolden RatioSplit a length in the golden proportionSector AreaArea of a circular sectorArc LengthLength of a circular arcVertex FormConvert a quadratic to vertex formParabolaVertex, focus and intercepts of a parabolaExponential GrowthGrowth or decay at a steady rateGeometric Sequencenth term and sum of a geometric sequenceTwo-Step EquationSolve ax + b = c step by stepIntegerSigned whole-number arithmeticOrder of OperationsEvaluate an expression step by stepSigma NotationSum an expression over a rangePercentagePercentage of, change & differenceFractionAdd, subtract and simplifyStandard DeviationSpread of a data setBinomial DistributionExact and cumulative probabilities
Everyday & Auto
Hours WorkedTimesheet totalsTime to DecimalConvert hours and minutes to decimal hours and backEngine DisplacementSwept volume of an engine from bore, stroke and cylindersElectricity CostCost of running an appliance from watts, hours and rateDays Between DatesDays, weeks and weekdays between two datesElapsed TimeTime between a start and an endTimecodeAdd or subtract video timecodes, with drop-frameUnit PriceCompare price per ounce, pound or literEV Charging CostCost to charge an electric car and cost per mileHours From NowDate and time a number of hours from nowCompression RatioStatic engine compression ratio from its dimensionsGrams to CupsConvert grams to cups for baking ingredientsAverage TimeAverage of a list of times, laps or splitsPizza DoughFlour, water, salt and yeast for pizza dough ballsTipTip and split the billGas MileageMPG and fuel costAgeExact age in years, months and days
Science & Physics
Projectile MotionRange, flight time and maximum height of a projectileForceForce, mass or acceleration from F = m × aAccelerationAcceleration from speed change, force or distanceKinematicsSolve constant-acceleration motion problemsSpeed Distance TimeSpeed, distance or time from the other twoIdeal Gas LawSolve PV = nRT for pressure, volume, moles or temperature