All Calculators
Every tool on the site, one page. Search, filter by category, and calculate.
Math
Arithmetic, fractions, percentages, ratios and everyday math tools that give you exact ans…
Browse 6 toolsCalculus & Algebra
Derivatives, integrals, matrices, complex numbers and scientific notation — solved numeric…
Browse 3 toolsGeometry
Area, volume and triangle calculators for shapes from squares to spheres.…
Browse 7 toolsStatistics
Standard deviation, z-scores, binomial probabilities, confidence intervals, correlation an…
Browse 5 toolsConversion
Currency, units, roman numerals and shoe sizes — convert between any two units locally.…
Browse 6 toolsDate & Time
Age, date and time math, pregnancy due dates, fertility windows and sleep planning.…
Browse 6 toolsHealth & Fitness
BMI, calories, BMR, body fat and calories burned — general reference tools, not medical ad…
Browse 2 toolsSpeed & Distance
Pace, speed and distance calculators for runners, cyclists and travellers.…
Browse 27 toolsLoans & Mortgages
Mortgage, auto, personal and student loan tools with full amortization and payoff plans.…
Browse 15 toolsInvesting & Retirement
Compound interest, SIP, ROI, IRR, NPV, 401(k) and retirement planning tools.…
Browse 8 toolsPersonal Finance
Tips, discounts, tax, budgets, net worth and inflation tools for everyday money decisions.…
Browse 3 toolsTax
Paycheck, income tax and capital gains estimators built on the rates you enter.…
Browse 3 toolsEducation
GPA and grade calculators for students planning their semester.…
Browse98 calculators
Percentage Calculator
Find a percentage of a number, percentage change and percentage difference in one tool.
Use toolAge Calculator
Exact age in years, months and days, plus days until your next birthday.
Use toolScientific Calculator
Full scientific calculator: trig, logs, powers, roots, constants and memory.
Use toolCurrency Calculator
Convert between 25 world currencies with an exchange rate you control.
Use toolUnit Conversion Calculator
Convert length, weight, temperature, area, volume, speed, time and data.
Use toolBMI Calculator
BMI, WHO category and healthy weight range — metric or imperial.
Use toolCalorie Calculator
Daily calorie needs (TDEE) and weight-change targets by activity level.
Use toolLoan Calculator
Monthly payment, total interest and amortization for any loan.
Use toolDate Calculator
Days between dates, plus adding or subtracting days, months and years.
Use toolTime Calculator
Add and subtract times, find durations, and total time lists.
Use toolFraction Calculator
Operate on fractions with simplified, mixed and decimal results.
Use toolMath Calculator
Evaluate arithmetic and scientific expressions in one line.
Use toolRandom Number Generator
Generate random numbers between any two values, with options.
Use toolArea Calculator
Area of any common shape, with perimeter too.
Use toolVolume Calculator
Volume and surface area of seven common 3D shapes.
Use toolTriangle Calculator
Solve right, SSS and SAS triangles — angles, sides and area.
Use toolQuadratic Equation Solver
Real or complex roots, discriminant and vertex of any quadratic.
Use toolDerivative Calculator
First and second derivatives of any function at a point.
Use toolIntegral Calculator
Definite integrals between any two limits, numerically.
Use toolMatrix Calculator
Matrix algebra: add, multiply, invert, determinant and more.
Use toolComplex Number Calculator
Complex arithmetic with magnitude, argument and conjugate.
Use toolScientific Notation Calculator
Convert to/from scientific notation and multiply sci-notation numbers.
Use toolRoman Numeral Converter
Convert numbers to roman numerals and back, up to 3,999.
Use toolShoe Size Conversion
Convert shoe sizes between US, UK, EU and CM for all ages.
Use toolRatio Calculator
Simplify ratios and solve a:b = c:x in one step.
Use toolProportion Calculator
Solve and verify proportions a/b = c/d with cross products.
Use toolProbability Calculator
Simple probability, at-least-once and combined independent events.
Use toolStandard Deviation Calculator
Mean, sample & population standard deviation for any data set.
Use toolZ-Score Calculator
Z-scores, percentiles and raw-value conversion for any data.
Use toolBinomial Distribution Calculator
Binomial probabilities: exactly, at most and at least k successes.
Use toolConfidence Interval Calculator
Confidence intervals for means and proportions with margin of error.
Use toolCorrelation Coefficient Calculator
Pearson r, r² and covariance for paired data.
Use toolLinear Regression Calculator
Least-squares line of best fit with R² and predictions.
Use toolConversion Calculator
15 categories of unit conversion, all offline.
Use toolPregnancy Due Date Calculator
Due date, conception date and current pregnancy week.
Use toolOvulation & Fertility Window Calculator
Ovulation date and fertile window for your cycle.
Use toolOptimal Bedtime / Sleep Calculator
Bedtimes and wake times aligned to 90-minute sleep cycles.
Use toolBMR Calculator
Basal metabolic rate via three validated formulas.
Use toolBody Fat Calculator
Body fat %, fat mass and lean mass from measurements.
Use toolCalories Burned Calculator
Calories burned for 50+ activities by weight and time.
Use toolPace Calculator
Pace per km/mile, speed and finish times for runners.
Use toolSpeed Calculator
Solve speed, distance and time in any units.
Use toolDistance Calculator
Distance, time or speed — travel math in any units.
Use toolGPA Calculator
Term GPA on 4.0 or 5.0 scales with credit weighting.
Use toolGrade Needed on Final Exam Calculator
The exact score you need on your final exam.
Use toolWeighted Grade Calculator
Weighted average with per-assignment weights.
Use toolTip Calculator
Tip amount, total bill and per-person split.
Use toolDiscount Calculator
Sale price and savings after single or stacked discounts.
Use toolSales Tax Calculator
Add or extract sales tax, with the tax amount shown.
Use toolEmergency Fund Target Calculator
Emergency savings target by months of expenses.
Use toolBudget Calculator
Monthly budget with net income and savings rate.
Use toolNet Worth Calculator
Net worth from your assets and liabilities.
Use toolInflation Calculator
Purchasing power of money over time at your chosen rate.
Use toolInflation Adjusted Return Calculator
Real (inflation-adjusted) return on any investment.
Use toolMortgage Calculator
Monthly mortgage payment with interest, taxes and insurance.
Use toolAuto Loan Calculator
Monthly car payment with down payment and trade-in.
Use toolMortgage Affordability Calculator
Maximum home price based on your income and debts.
Use toolMortgage Amortization Schedule Generator
Full payment-by-payment amortization table.
Use toolMortgage Payment Calculator
Monthly P&I with the first-payment interest split.
Use toolMortgage Closing Costs Estimator
Itemized closing costs and total cash needed.
Use toolMortgage Extra Payment Impact Calculator
Time and interest saved by extra payments.
Use toolMortgage Rate Comparison Tool
Monthly and lifetime difference between two rates.
Use toolMortgage Refinance Break-Even Calculator
Months until your refinance pays for itself.
Use toolRefinance Savings & Costs Calculator
Full refinance comparison: savings, costs and break-even.
Use toolPrivate Mortgage Insurance (PMI) Cost Calculator
Monthly PMI cost and how to avoid it.
Use toolMortgage Payoff Date Calculator
Payoff date and interest saved with extra payments.
Use toolBiweekly Mortgage Savings Calculator
Time and interest saved with biweekly payments.
Use toolExtra Payment Mortgage Savings Calculator
Exact time and interest savings from extra payments.
Use toolCredit Card Payoff Calculator – Avalanche
Avalanche payoff plan: highest APR first.
Use toolCredit Card Payoff Calculator – Snowball
Snowball payoff plan: smallest balance first.
Use toolCredit Card Interest Calculator
Monthly interest, payoff time and total interest.
Use toolMinimum Payment Impact Calculator
Minimum vs extra payment: the real cost difference.
Use toolBalance Transfer Savings Calculator
Savings from a 0% balance transfer, fee included.
Use toolDebt Payoff Calculator
Complete debt payoff plan across all your debts.
Use toolDebt Consolidation Calculator
Compare your current debts with a consolidation loan.
Use toolDebt-to-Income Ratio Calculator
Front-end and back-end DTI — the lender's key number.
Use toolPersonal Loan Calculator
Personal loan payments with total interest.
Use toolStudent Loan Calculator
Student loan payments and total interest.
Use toolCar Affordability Calculator
Maximum car price from your monthly budget.
Use toolAuto Loan Refinance Calculator
Auto refinance comparison: savings and break-even.
Use toolCompound Interest Calculator
Compound growth with monthly contributions, year by year.
Use toolRetirement Calculator
Retirement projections with inflation adjustment.
Use toolInvestment Calculator
Investment growth with contributions, nominal and real.
Use toolSavings Calculator
Savings growth and the deposit needed for a goal.
Use toolROI Calculator
ROI, net profit and annualized return (CAGR).
Use toolIRR Calculator
IRR and NPV from your cash flow series.
Use toolNPV Calculator
Net present value of future cash flows.
Use toolProfit Margin Calculator
Profit, margin % and markup from revenue and cost.
Use toolMarkup Calculator
Selling price, profit and margin from cost + markup.
Use toolBreak-Even Calculator
Units and revenue needed to break even.
Use tool401(k) Calculator
401(k) growth with employer match and tax effect.
Use toolSIP Calculator
SIP growth with optional annual step-up.
Use toolLump Sum vs SIP Calculator
Compare lump-sum investing with monthly SIP.
Use toolDividend Yield Calculator
Dividend yield and income from your holdings.
Use toolRental Property ROI Calculator
Cap rate, cash-on-cash return and cash flow.
Use toolPaycheck Calculator
Net take-home pay with taxes and deductions.
Use toolIncome Tax Calculator
Estimated income tax from your income and deductions.
Use toolCapital Gains Tax Calculator
Taxable gain, tax due and net proceeds on sales.
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