Calculators tools
Money, health, dates and units — each one shows how it got there.
130 of the 141 run entirely in your browser — nothing uploaded, working offline — and every page says which before you pick a file.
141 tools
- Tip CalculatorCalculate tip amount and split the bill across people.
- Age CalculatorCompute your exact age in years, months, days from a birthdate.
- BMI CalculatorBody Mass Index for metric or imperial units.
- Percentage CalculatorWhat is X% of Y, X is what % of Y, percent change, percent increase/decrease.
- Days Between DatesHow many days between two dates? Includes weeks, months, and business days.
- Unit ConverterLength / weight / temperature / volume / area / speed conversion.
- Time Zone ConverterConvert a time between any two IANA time zones.
- Mortgage CalculatorMonthly payment, total interest, full amortisation schedule.
- Loan CalculatorGeneric instalment loan: payment, total interest, schedule.
- Currency ConverterConvert between 150+ currencies. Live rates, no API key required.
- Unix Timestamp ConverterConvert between Unix timestamps and human-readable dates.
- Random Number GeneratorGenerate one or many random numbers within a range.
- Discount CalculatorSale price after a percentage off.
- Sales Tax CalculatorAdd or remove sales tax / VAT from a price.
- Pace CalculatorRunning pace, time, or distance — fill any two, get the third.
- US Federal Income Tax CalculatorEstimate 2025 US federal income tax — single, married joint/separate, head-of-household.
- US State Income Tax CalculatorEstimate state income tax using a flat rate or your state’s 2025 brackets.
- Take-Home Pay CalculatorNet paycheck after federal, state, FICA, and 401(k) — annual or per-paycheck.
- Self-Employment Tax CalculatorSE tax (15.3%) on net earnings, with the half-deduction for income tax purposes.
- 1099 Contractor Tax CalculatorEstimate total tax (federal + SE) for 1099 income with deductions.
- Quarterly Estimated Tax (1040-ES)Compute your quarterly estimated tax payments to avoid IRS underpayment penalties.
- Tax Bracket CalculatorShow your marginal and effective federal tax bracket for 2025.
- Capital Gains Tax CalculatorLong-term and short-term capital gains tax (US, 2025 brackets).
- FICA Tax CalculatorSocial Security (6.2%) + Medicare (1.45%) + 0.9% additional Medicare over thresholds.
- Employer Payroll Burden CalculatorTrue cost to employer per employee: salary + employer FICA + FUTA + SUTA + benefits.
- Property Tax CalculatorAnnual property tax from assessed value and mill rate or percentage.
- Reverse Sales Tax CalculatorBack-calculate the pre-tax amount from a tax-included total.
- VAT CalculatorEU/UK Value Added Tax — add or subtract VAT from a price.
- GST CalculatorGST for AU (10%), CA (5%+PST), IN (5/12/18/28%), NZ (15%) — add or extract.
- UK Income Tax & National Insurance CalculatorEstimate UK PAYE income tax + Class 1 National Insurance for 2024/25.
- Canada Income Tax CalculatorFederal + provincial income tax + CPP + EI for 2025.
- India Income Tax CalculatorOld vs new tax regime comparison for AY 2025-26 with 80C/80D deductions.
- Australia Income Tax CalculatorPAYG income tax + Medicare levy for 2024-25 (resident rates).
- Crypto Capital Gains Tax CalculatorCrypto-to-USD capital gains, short vs long-term US treatment.
- RSU Tax CalculatorTax on vesting RSUs (ordinary income) + capital gains on subsequent sale.
- Stock Option Tax (ISO/NSO) CalculatorTax on exercising and selling ISOs (AMT) and NSOs (ordinary income).
- Gift Tax CalculatorUS gift tax with annual exclusion ($19k 2025) and lifetime exemption tracker.
- Estate / Inheritance Tax CalculatorUS federal estate tax with the lifetime exemption ($13.99M, 2025).
- Roth Conversion Tax CalculatorTax cost of converting Traditional IRA → Roth IRA at your marginal bracket.
- Compound Interest CalculatorFuture value with periodic contributions, compounded daily/monthly/yearly.
- ROI / CAGR CalculatorReturn on investment, annualized growth (CAGR), and total return.
- 401(k) Retirement CalculatorProject 401(k) balance at retirement with contributions + employer match.
- Roth IRA CalculatorProject Roth IRA balance at retirement (tax-free growth).
- Savings Goal CalculatorMonthly amount to reach a savings target by a date.
- Retirement Nest Egg Calculator (4% Rule)How much you need to retire using the 4%-rule withdrawal.
- Stock Split CalculatorAdjusted shares + price after a forward or reverse stock split.
- Dividend Yield CalculatorYield, annual income, and yield-on-cost for any holding.
- DRIP (Dividend Reinvestment) CalculatorCompound dividends reinvested over time.
- Bond Yield-to-Maturity CalculatorYTM, current yield, and total return on a bond.
- Inflation CalculatorBuying power of money over time given inflation rate.
- Credit Card Payoff CalculatorMonths to clear a balance + total interest at a fixed payment.
- Debt Snowball / Avalanche CalculatorCompare snowball (smallest first) vs avalanche (highest rate) payoff.
- Balance Transfer Break-Even CalculatorNet savings of a 0% balance transfer after the transfer fee.
- Auto Loan CalculatorMonthly payment, total interest, payoff schedule for a car loan.
- Lease vs Buy CalculatorCompare total cost of leasing vs financing the same vehicle.
- Mortgage Refinance Break-EvenHow long to recoup closing costs from a lower rate.
- HELOC CalculatorAvailable HELOC line + interest-only / amortizing payment.
- Rent vs Buy CalculatorNet cost of renting vs owning over a holding period.
- Cap Rate / NOI CalculatorNet operating income, cap rate, and cash-on-cash return.
- Rental Yield CalculatorGross and net rental yield on an investment property.
- ARV / 70% Rule CalculatorMaximum offer for a fix-and-flip using the 70% rule.
- Mortgage Points Break-EvenYears to recoup the cost of buying down your rate.
- Break-Even CalculatorUnits / revenue to cover fixed costs at a given margin.
- Burn Rate / Runway CalculatorMonthly burn + months of runway from cash on hand.
- LTV : CAC CalculatorCustomer lifetime value over acquisition cost ratio.
- DCF (Discounted Cash Flow) CalculatorPresent value of a stream of future cash flows.
- Rule of 40 SaaS CalculatorGrowth rate + profit margin must clear 40% — see where you sit.
- BMR / TDEE CalculatorBasal metabolic rate + total daily energy expenditure (Mifflin-St Jeor).
- Macro CalculatorProtein / carbs / fat split based on goal and TDEE.
- Body Fat % Calculator (Navy Method)Estimate body fat from neck, waist (and hip for women).
- Ideal Weight CalculatorHamwi, Devine, Robinson, Miller — see all four formulas.
- Lean Body Mass CalculatorBoer, James, and Hume LBM formulas.
- 1-Rep Max CalculatorEstimate 1RM with Brzycki, Epley, Lombardi, O'Conner formulas.
- Heart Rate Zones Calculator (Karvonen)Training zones from max HR and resting HR.
- VO₂ Max EstimatorCooper test, Rockport walking test, or 1.5-mile run estimates.
- Marathon / Race Time PredictorProject marathon time from a recent 5k/10k/half (Riegel formula).
- Calories Burned by ActivityMETs-based calorie burn for ~30 common activities.
- Daily Water Intake CalculatorRecommended ml/oz of water based on weight and activity.
- Blood Alcohol Content (BAC) CalculatorEstimate BAC using the Widmark formula.
- Pregnancy Due Date CalculatorEstimated due date from LMP, conception date, or ultrasound.
- Ovulation CalculatorLikely fertile window from last menstrual period.
- GPA CalculatorCompute weighted or unweighted GPA on a 4.0 scale.
- Final Grade Needed CalculatorScore needed on the final to hit a target overall grade.
- Semester Grade CalculatorCompute final semester grade from weighted assignments.
- Quadratic Formula SolverSolve ax² + bx + c = 0 — real and complex roots, vertex, discriminant.
- Statistics CalculatorMean, median, mode, std dev, variance, quartiles for a number list.
- Permutations & Combinations CalculatornPr, nCr, factorial, binomial coefficient.
- Matrix CalculatorAdd, multiply, transpose, determinant, inverse for small matrices.
- Linear Regression CalculatorBest-fit line, R², slope and intercept for x/y pairs.
- Probability CalculatorSingle, joint, conditional, complement, union probabilities.
- Reading Time EstimatorEstimated read time + Flesch readability score for a piece of text.
- Recipe ScalerScale ingredient quantities up or down.
- Oven Temperature ConverterConvert °F ↔ °C ↔ Gas Mark.
- Cocktail Ratio CalculatorScale a cocktail recipe to a target volume or serving count.
- Coffee Brew Ratio CalculatorCoffee + water ratio for pour-over, French press, espresso.
- Bread Hydration CalculatorHydration % from flour + water for sourdough and artisan breads.
- Pet Age Calculator (Dog / Cat → Human Years)AAHA-style age conversion for dogs (by size) and cats.
- Scientific CalculatorFull scientific calculator — trig, log, exp, factorial, constants, memory.
- Graphing CalculatorPlot functions y=f(x), polar, parametric — zoom, pan, intersection.
- Fraction CalculatorAdd, subtract, multiply, divide fractions with mixed numbers + simplification.
- Algebra / Equation SolverSolve linear and quadratic equations step-by-step.
- Length ConverterConvert mm, cm, m, km, inch, foot, yard, mile — all in one.
- Weight ConverterConvert kg, g, lb, oz, stone, ton.
- Temperature ConverterCelsius ↔ Fahrenheit ↔ Kelvin ↔ Rankine.
- Volume ConverterLiters, gallons, milliliters, cups, pints, quarts, fluid ounces.
- Speed Convertermph ↔ km/h ↔ m/s ↔ knots.
- Data Size ConverterBits, bytes, KB, MB, GB, TB, PB — decimal and binary (KiB) modes.
- Pressure / Energy / Power ConverterPa, bar, psi, atm, J, kJ, cal, W, kW, hp — multi-domain converter.
- HEX ↔ RGB ↔ HSL ↔ PantoneConvert between all major color formats and find the nearest Pantone match.
- Roman Numerals ConverterConvert Arabic ↔ Roman numerals (up to 3999999).
- Number to WordsWrite numbers as English words — for checks, contracts, legal docs.
- Number Base ConverterConvert between binary, octal, decimal, hex, and any base 2-36.
- Pregnancy Week-by-WeekDetailed weekly pregnancy guide — baby size, milestones, what to expect.
- Sleep Cycle CalculatorBest times to wake up (or sleep) using 90-min REM cycles.
- Steps / Distance / StrideConvert steps ↔ miles/km using your stride length and height.
- Period / Cycle TrackerProject next 6 periods + fertile window from a recent cycle.
- Baby Name GeneratorBrowse and generate baby names by origin, meaning, gender, popularity.
- Pet Name GeneratorCute, funny, classic pet names for dogs, cats, and small pets.
- EMI Calculator (Loan)Equated Monthly Installment for home / auto / personal loans.
- SIP CalculatorMutual fund SIP corpus growth with monthly contributions + step-up option.
- Lumpsum Investment CalculatorProject growth of a one-time investment over years.
- Net Worth TrackerAssets minus liabilities — full personal balance sheet.
- Wedding Budget CalculatorAllocate your wedding budget across venue, catering, photography, attire, etc.
- Trip Cost CalculatorEstimate total trip cost: flights, lodging, food, transport, activities.
- Gas Cost CalculatorTrip fuel cost from distance + MPG + gas price.
- Salary Hike CalculatorNet hike amount + new monthly salary from a percentage raise.
- Cost of Living ComparisonCompare cost of living between two cities (housing, food, transport, taxes).
- Hourly to Salary CalculatorConvert hourly rate ↔ weekly / monthly / annual salary.
- Freelance Rate CalculatorWhat to charge per hour given target salary, expenses, and billable hours.
- ATS Resume CheckerScore your resume against a job description for ATS compatibility.
- LinkedIn Profile AnalyzerPaste your LinkedIn profile text — get AI-driven feedback on headline, summary, experience.
- Salary Negotiation CalculatorCounter-offer math + value-of-equity + benefits dollar-equivalent.
- AI Interview Question GeneratorGenerate realistic interview questions for any role + level.
- NDA GeneratorNon-disclosure agreement — mutual or one-way, US/EU presets.
- Contract Template GeneratorServices / freelance / consulting contract from a few inputs.
- Privacy Policy GeneratorGDPR + CCPA + LGPD compliant privacy policy for any website.
- Terms of Service GeneratorStandard ToS for SaaS, e-commerce, or content sites.
- Cookie Banner GeneratorGDPR-compliant cookie consent banner HTML + JS.
- DMCA Takedown Letter GeneratorGenerate a DMCA takedown notice for copyright infringement.
- Letter of Recommendation GeneratorGenerate a professional recommendation letter using AI.
- Rental Agreement GeneratorResidential lease / rental agreement template.