The Master Directory
An organized, complete index of every powerful tool built into NumberPrism. Click any link to jump straight to the calculator.
Finance & Money82 Tools
Mortgage Calculator - Estimate Monthly Home Loan PaymentsLoan Calculator - Calculate Monthly Payment, Interest and Total CostAuto Loan Calculator - Estimate Car Payment, Interest and TaxesInvestment Calculator - Estimate Future Value and Investment GrowthRetirement Calculator - Estimate How Much You Need to RetireSalary Calculator — Free Salary to Hourly, Monthly & Annual ConverterInflation Calculator - Measure Buying Power Over TimeCompound Interest Calculator — See How Your Money Grows Over TimeSimple Interest Calculator — Calculate Interest on Loans & SavingsDiscount Calculator — Sale Price After X% Off (With Tax)SIP Calculator — Estimate Mutual Fund Returns & Wealth GrowthSales Tax & VAT Calculator — Add or Remove TaxCurrency Converter — Live & Manual RatesEmergency Fund CalculatorSavings Goal CalculatorDebt Payoff CalculatorExtra Mortgage Payment CalculatorLoan Affordability CalculatorNet Worth Calculator50/30/20 Budget Calculator4% Rule Retirement CalculatorMarginal tax bracketPerpetuity valueAPR vs interest rateAdjustable-rate mortgageAnnuity payoutCar lease vs buyClosing costsFreelance hourly rateInterest-only mortgageLoan prepayment penaltyLump sum vs DCAPMI costRent vs buySeverance payWedding budgetBiweekly mortgageBulk buy comparisonCommission payCompound annual growth rateCurrency conversion feeDividend yieldEducation fundExpense ratio costFIRE numberHome affordabilityInvestment fee impactMinimum payment payoffMortgage refinance break-evenPresent valueProperty taxRetirement withdrawalRule of 72Auto loan affordabilityCredit utilizationDebt avalancheDebt payoff dateDebt snowballDebt-to-income ratioDollar-cost averagingDown payment goalEarly loan payoffFuture valueHourly to salaryInflation-adjusted salaryLoan comparisonMonthly cash flowOvertime payPay raisePersonal loan paymentSalary to hourlySales tax inclusiveSavings interestSavings rateSinking fundStacked discountStudent loan repaymentSubscription auditUnit price comparisonVAT reverseVacation savings goalZero-based budget
Health & Fitness89 Tools
BMI Calculator — Check Your Body Mass Index (WHO Standard)Calorie Calculator - Estimate Daily Calories and TDEEBody Fat Calculator - Estimate Body Fat Percentage OnlineBMR Calculator - Estimate Basal Metabolic Rate OnlineIdeal Weight Calculator - Find a Healthy Weight RangePregnancy Calculator - Estimate Due Date and Pregnancy TimelineOvulation Calculator - Estimate Fertile Days and OvulationTDEE CalculatorHeart Rate Zones CalculatorDaily Water Intake CalculatorMacro Split CalculatorRunning Pace CalculatorOne-Rep Max CalculatorHydration deficitPregnancy weight gainSun exposure timeBody surface areaFat-free mass indexHat size from circumferenceLDL estimateMacro calories checkMenstrual period lengthPonderal indexRing size from circumferenceSPF reapply timeScreen timeSleep efficiencyVO2 max estimateA1C to eAGAlcohol caloriesAlcohol unitsBMI primeBody frame sizeCaffeine limitCalorie surplusCarb targetCholesterol ratioClothing sizeFat targetFiber targetLean body massProtein per mealResting heart rateShoe sizeSodium limitSugar limitSwimming caloriesWeight gain timelineBasal caloriesBedtimeBlood glucose unitBlood pressure categoryCalorie deficitCycling caloriesHealthy weight rangeMax heart rateProtein per kgProtein targetRunning caloriesSleep cycleSleep debtSteps to distanceWaist-to-height ratioWaist-to-hip ratioWake timeWalking caloriesWater goal by activityWeight loss timelineSki caloriesTraining loadHiking timeJump rope caloriesRace equivalenceRest intervalRowing splitTrail elevationTriathlon timeVO2 maxWorkout volumeYoga caloriesCycling speedSwimming pace1RM percentage tableMET caloriesRunning distanceRunning finish timeSplit timesSteps to caloriesTreadmill pace
Math & Education36 Tools
Basic Calculator - Free Online Calculator for Everyday MathScientific Calculator - Free Online Calculator for Math and TrigTriangle Calculator - Find Sides, Angles, Area and PerimeterFraction Calculator - Add, Subtract, Multiply and Divide FractionsPercentage Calculator — What Is X% of Y? Increase & DecreaseGPA Calculator — CGPA & SGPA on 4.0 and 10-Point ScalePercentage Change Calculator - Calculate Increase or DecreaseFinal Grade Needed CalculatorGPA to Percentage CalculatorCumulative GPA CalculatorPercentile rankReading list timeCourse loadCredit hoursPomodoro planReading timeScholarship gapStudy timeWords per pageTest score improvementTuition costAssignment gradeAttendanceCollege budgetExam countdownFinal exam scoreGPA goalPercentage to GPAQuiz averageSGPASemester averageStudent loanTest score percentageUnweighted GPAWeighted GPAWeighted average
Date & Time43 Tools
Age Calculator - Find Your Exact Age from Date of BirthDays Between Dates Calculator — Count Days, Weeks & Months Between Two DatesDays Between Dates CalculatorBusiness Days CalculatorAdd Days to Date CalculatorAge in Days CalculatorISO week dateSchool start ageAdd business daysFlight arrival timeSubtract business daysAdd years to dateAge in hoursAnniversary countdownDate difference inclusiveDays left in yearHoliday countdownLeap year checkerMeeting time across zonesRetirement countdownTax deadline countdownTime zone offset differenceWedding countdownWeek numberAdd months to dateAge at future dateAge in monthsAge in weeksBaby age in weeksBreak deductionCountdown to eventDate format converterDays until birthdayDuration between timestampsNext birthdayOvernight shift durationOvertime hoursProject deadlineSubtract days from dateTimesheet totalUnix timestamp converterWeekday for a dateWork hours between times
Converters51 Tools
Unit Converter - Convert Length, Weight, Temperature OnlineCM to Inches ConverterKG to Pounds ConverterCelsius to Fahrenheit ConverterCups to Millilitres ConverterHat size conversionPrint sizeResolution px to cmRing size conversionArea acre to hectareBandwidth Mbps to MB/sCSS rem to pxCooking butter sticksCrypto manual rateData GB to TBForce N to lbfFrequency Hz to rpmFuel mpg UK to USHard drive real capacityPower W to hpPressure bar to psiShoe size UK to USTemperature C to KTime hours to daysTorque Nm to lb-ftTypography pt to pxAngle degrees to radiansArea m2 to ft2Clothing men US to EUClothing women US to EUCooking grams to ozCooking oven C to FCooking tbsp to tspCurrency manual rateData B to KBData MB to GBEnergy kJ to kcalFuel L/100km to mpg USLength km to milesLength m to feetPace min/km to min/miPaper A4 to LetterScreen aspect ratioShoe size US to EUSpeed kmh to mphTime minutes to hoursTime seconds to minutesTime zone offsetVolume litres to US gallonsVolume ml to fl ozWeight g to ounces
Home & Construction82 Tools
Electricity Cost CalculatorPaint Coverage CalculatorTile CalculatorConcrete Slab CalculatorDrywall Sheets CalculatorMoving costStorage costThermostat savingsWindow filmAir filterCleaning suppliesFence panelsFurniture fitPet food costPlant wateringCar ownership costCarpet quantityCeiling areaCooling costDeck stainGas billGravelHeating costHome maintenance budgetInternet planLED savingsLaundry costLawn seedMulchPet agePhone planPool volumePublic transit costRideshare costSoilStreaming costWallpaper quantityAppliance energy useCoffee costDaily commute costFlooring quantityGrocery budgetMeal costPaint costRent affordabilityRoom areaSubscription costTile quantityUtility splitWall areaWater billConcrete stairsDeck boardsFence posts and railsRoof underlaymentSidingCarpet areaConcrete columnDrywall mudHVAC tonnageJoint compoundLaminateRebarRoofing shinglesStuccoThin-setTopsoilWallpaper rollsBTUBrickCement bagsConcrete blockConcrete footingFlooring planksGravel tonnageGroutInsulationMortarPaintPrimerSandTile boxes
Food & Cooking34 Tools
Tip Calculator — How Much to Tip? Quick Tip & Bill SplitterRecipe Scaling CalculatorOven Temperature ConverterCoffee Ratio CalculatorPressure cooker conversionSous vide timeAlcohol dilutionBaking pan sizeBrine concentrationCocktail batchMarinade ratioMeat cooking timeMicrowave timeParty drink batchPickling ratioRoast timeSlow cooker conversionSourdough starter ratioTea strengthTurkey sizeYeast conversionAir fryer conversionCold brew ratioFrench press ratioPasta servingRecipe nutritionRice water ratioSteak doneness tempCalories per servingCooking unit converterDough hydrationEspresso yieldMacros per servingRecipe portion cost
Travel & Auto28 Tools
Fuel Cost CalculatorRoad Trip Cost SplitJet lagTrain ticket valueAirbnb vs hotelBaggage feeBike commuteEV charging costEV vs gasLease mileagePassport expiryRest stop plannerRoad tollTravel insuranceVisa daysCurrency exchange feeDaily travel allowanceFlight time zone shiftHotel per nightParking costRoad trip timeTaxi fare estimateAnnual commute costFuel per kmMPG trip costRideshare splitRoad trip cost splitTravel budget
Business34 Tools
Profit Margin CalculatorBreak-Even CalculatorFreelance Rate CalculatorReorder pointSafety stockAd ROIBillable hoursCustomer acquisition costCustomer lifetime valueEmployer costHourly rateInventory turnoverPackaging costPayroll costProject estimateQuote totalUtilization rateARRCash runwayChurn rateContribution marginConversion rateMRRROASShipping costTrade discountBurn rateCOGSGross marginInvoice totalMarkupProduct pricingSales taxVAT
Everyday & Fun21 Tools
Password Generator - Create Strong Random Passwords OnlineRandom Number Generator - Generate Random Numbers OnlineBill Split CalculatorPizza Value CalculatorTournament bracketSecret Santa budgetCake servingCoffee order costGroup expenseGroup giftParty drink quantityParty food quantityPizza party quantityTeam shuffleWeighted decision matrixCoin flipDice rollGift splitGroup trip splitPros and cons scoreRandom picker
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