Free Online Calculators – Finance, Math & More

CalculatorsDiscount CalculatorCalculate percentage discounts, sale prices, and savings. Find the original price or combine two discounts using this free online calculator.

CalculatorsMortgage CalculatorEstimate monthly mortgage payments, principal and interest, down payments and optional housing costs. Explore your loan's amortization.

CalculatorsPercentage CalculatorCalculate percentages, find percentage changes, and increase or decrease numbers with free online percentage formulas.

CalculatorsAge CalculatorCalculate your exact age from your date of birth in years, months, and days. Check total days, weeks, and your next birthday with this free online age calculator.

CalculatorsDate Difference CalculatorCalculate the days between two dates for free. See calendar years, months, days, completed weeks, and total days in your browser.

CalculatorsProfit Margin CalculatorCalculate gross profit, profit margin, and markup instantly. Find the selling price you need for a target margin or markup with this free online calculator.

CalculatorsCompound Interest CalculatorCalculate compound interest online for free. Estimate savings and investment growth with monthly or annual contributions, flexible compounding, and yearly results.

CalculatorsInvestment CalculatorEstimate future investment growth, monthly or annual contributions, total gains, and ROI with Nimzoa's free online Investment Calculator.

CalculatorsLoan / EMI CalculatorFree EMI calculator and loan calculator to estimate monthly payments, total interest, processing fees, and loan repayment schedules.

CalculatorsBMI CalculatorCalculate your Body Mass Index (BMI) free online using height and weight. Get an adult BMI category, visual BMI chart, healthy-weight reference range, BMI Prime, and Ponderal Index.

CalculatorsVAT CalculatorAdd or extract VAT with discounts, quantities, mixed-rate items, currency rounding and CSV export.

CalculatorsGST CalculatorAdd or extract GST with discounts, itemized rates and an optional India CGST/SGST or IGST breakdown.

CalculatorsSales Tax CalculatorEstimate inclusive or exclusive sales tax with U.S. state/local components, exemptions, mixed items and CSV export.

CalculatorsMarkup CalculatorCompare markup and profit margin, reverse-price targets, discounts and weighted multi-product profitability.

CalculatorsNet Profit CalculatorCalculate gross, operating and net profit with detailed expenses, scenarios and break-even estimates.

CalculatorsSimple Interest CalculatorCalculate and reverse simple interest using dates, day-count conventions, comparison and schedules.

CalculatorsWorking Capital CalculatorItemize current assets and liabilities, compare liquidity ratios and estimate the cash conversion cycle.

CalculatorsDepreciation CalculatorCompare straight-line, declining-balance and SYD depreciation with reconciled schedules.

CalculatorsROI CalculatorCalculate total and annualized ROI with additional costs and clear profit or loss.

CalculatorsAspect Ratio CalculatorSimplify width and height ratios, fill missing dimensions and scale proportionally.

CalculatorsSalary to Hourly CalculatorConvert annual, monthly, weekly or biweekly gross salary into effective hourly pay.

CalculatorsHourly to Salary CalculatorConvert an hourly rate into gross salary equivalents with optional overtime.

CalculatorsCPM CalculatorCalculate ad CPM, total campaign cost or estimated impressions with clear formulas.

CalculatorsSpeed Distance Time CalculatorSolve speed, distance or travel time with kilometers, miles and metric speed units.

CalculatorsPythagorean Theorem CalculatorSolve a missing right-triangle leg or hypotenuse, with area, perimeter and angles.

CalculatorsOhm's Law CalculatorSolve voltage, current, resistance and power from any two known electrical values.

CalculatorsHours and Minutes CalculatorAdd or subtract durations and convert between time, decimal hours and total minutes.

CalculatorsRental Yield CalculatorCompare gross and net rental yield using rent, purchase price and property costs.

CalculatorsRent Proration CalculatorEstimate move-in or move-out rent using calendar days or a fixed 30-day method.

CalculatorsCap Rate CalculatorEstimate capitalization rate, NOI or property value from annual income and expenses.

CalculatorsTime Duration CalculatorFind elapsed time between dates or overnight times, with optional break deduction.

CalculatorsInflation CalculatorEstimate hypothetical future or present purchasing power and reverse annual inflation rates.

CalculatorsWork Hours CalculatorTotal Monday–Sunday shifts with overnight clock times, unpaid breaks and optional gross pay.

CalculatorsArea CalculatorFind the area of seven common shapes and convert metric or imperial square units.

CalculatorsVolume CalculatorFind six solid-shape volumes and convert cubic units, liters and US gallons.

CalculatorsSavings CalculatorProject savings growth or solve a required monthly or yearly contribution for a goal.

CalculatorsWorking Days CalculatorCount working and nonworking days across a date range with custom workweeks and holidays.

CalculatorsBusiness Days CalculatorAdd or subtract business days from a start date with custom weekends and holidays.

CalculatorsVoltage Drop CalculatorEstimate copper or aluminum two-wire resistive cable voltage drop and load voltage.

CalculatorsAverage CalculatorCalculate count, sum, arithmetic mean, median, minimum, maximum and mode for numbers separated by commas, spaces or newlines.

CalculatorsBMR CalculatorEstimate adult basal metabolic rate in kcal/day with the Mifflin–St Jeor equation using metric or imperial height and weight.

CalculatorsConcrete CalculatorEstimate concrete for slabs, rectangular footings and cylindrical columns in cubic meters, feet and yards, with optional quantity and waste allowance.

CalculatorsBody Fat CalculatorEstimate adult body-fat percentage with the published Relative Fat Mass (RFM) equation using height and waist. Metric or imperial, private and browser-local.

CalculatorsAntilog CalculatorCalculate base-10, natural or custom-base antilogs with adjustable display precision, scientific notation and clear numerical range warnings.

CalculatorsAPR CalculatorEstimate the annualized borrowing cost from loan payments and financing fees using a numerical cash-flow APR calculation.

CalculatorsAuto Lease CalculatorEstimate vehicle lease payments from capitalized cost, residual value and money factor, with separate fees, tax treatments and optional excess-mileage costs.

CalculatorsBAC CalculatorExplore a documented Widmark-style blood alcohol concentration estimate from body weight, beverage amounts and elapsed time. Educational use only.

CalculatorsBinary CalculatorCalculate exact binary integer arithmetic with BigInt, quotient/remainder division, and optional fixed-width bitwise operations and shifts.

CalculatorsBody Surface Area CalculatorEstimate body surface area with Mosteller, Du Bois or Haycock formulas. Use metric or imperial measurements and optionally compare all three estimates.

CalculatorsBody Type CalculatorEstimate a common body-shape convention from bust/chest, waist and hip measurements, with transparent ratios and optional schematic illustration.

CalculatorsBond CalculatorPrice a fixed-coupon bond from yield or solve yield to maturity from market price, with current yield and transparent cash-flow assumptions.

CalculatorsBra Size CalculatorEstimate a starting bra band and cup from underbust and full-bust measurements using clearly labeled US, UK or EU sizing conventions.

CalculatorsBTU CalculatorEstimate room heating or cooling capacity in BTU/hour and kW with explicit dimensions, insulation, temperature and optional internal-gain assumptions.

CalculatorsCalorie CalculatorEstimate adult maintenance calories, resting expenditure and guarded goal intake with Mifflin, revised Harris–Benedict or Katch–McArdle equations.

CalculatorsCalories Burned CalculatorEstimate activity energy from referenced MET values, body weight and duration, with clear gross/net totals and optional multi-activity sessions.

CalculatorsCarbohydrate CalculatorConvert daily calories and a chosen carbohydrate percentage into grams, or estimate maintenance energy with shared adult equations and optional meal allocation.

CalculatorsCD CalculatorEstimate certificate-of-deposit maturity value, interest and APY, with optional illustrative taxes, early-withdrawal penalties and two-offer comparison.

CalculatorsCircumference CalculatorFind circumference, radius, diameter and area from one circle measurement. Get automatic results, unit conversion, formulas and a labeled diagram.

CalculatorsConception CalculatorEstimate a fertilization dating anchor from LMP, due date, ultrasound, IVF transfer or a known date, with clear assumptions and private browser-local calculations.

CalculatorsDay CounterCount business days or add/subtract calendar and business days, with custom weekends, one-time and recurring holidays, and a clear calendar preview.

CalculatorsDebt-to-Income Ratio CalculatorCalculate housing and total debt-to-income ratios, normalize annual income, and explore target capacity and separate what-if scenarios.

CalculatorsDensity CalculatorSolve density, mass or volume from two known quantities, with dimensional unit conversion, a clear relationship diagram and SI substitutions.

CalculatorsDew Point CalculatorEstimate dew point, relative humidity or air temperature with a documented Magnus approximation, clear units and temperature-spread visualization.

CalculatorsDivision CalculatorDivide signed integers and finite decimals exactly as rational numbers, with rounded or repeating labels and a real step-by-step long-division walkthrough.

CalculatorsDown Payment CalculatorCalculate cash down, percentage or implied purchase price, then explore optional financing, closing costs and clearly labeled home-cost comparisons.

CalculatorsDue Date CalculatorEstimate pregnancy due dates from LMP, conception, ultrasound dating or IVF transfer, with date-safe gestational progress and a clear milestone timeline.

CalculatorsFinance CalculatorSolve N, nominal annual interest, present value, payment or future value with signed cash flows, separate payment and compounding frequencies, and balance schedules.

CalculatorsExponents CalculatorCalculate powers or solve for a real base or exponent, with exact integer and rational results, perfect-root checks and transparent approximate forms.

CalculatorsFactorial CalculatorCalculate exact factorials through 10,000 with BigInt, digit and trailing-zero counts, scientific previews and a readable factorial-growth chart.

CalculatorsFHA Loan CalculatorEstimate FHA purchase payments, upfront and recurring mortgage insurance, closing cash, amortization and extra-payment savings with explicit policy assumptions.

CalculatorsFraction CalculatorAdd, subtract, multiply or divide exact fractions, mixed numbers, integers and finite decimals with clear reduction steps.

CalculatorsFraction SimplifierReduce signed fractions and mixed numbers exactly, with the greatest common factor, mixed form and separate decimal approximation.

CalculatorsFuel Cost CalculatorEstimate trip fuel, fuel-only cost, tolls and parking, contingency and per-person cost with precise US, imperial and metric conversions.

CalculatorsFuture Value CalculatorProject lump sums and recurring contributions using explicit compounding, matching payment periods and optional inflation adjustment.

CalculatorsGas Mileage CalculatorCalculate fuel efficiency from distance, odometers or multiple fill-ups, with correctly weighted overall consumption and unit comparisons.

CalculatorsGCF CalculatorFind the exact nonnegative greatest common factor of signed integers, inspect Euclidean steps and calculate the LCM when all inputs are nonzero.

CalculatorsGFR CalculatorEstimate adult kidney filtration using race-free 2021 CKD-EPI equations, with documented lab units and non-diagnostic GFR categories.

CalculatorsGolf Handicap CalculatorExplore provisional 18-hole handicap calculations using the USGA differential-selection table, counted scores and correctly staged course/playing rounding.

CalculatorsGPA CalculatorCalculate semester or cumulative GPA and target feasibility using editable courses, credits, grading scales and explicitly capped weighting.

CalculatorsGravel CalculatorEstimate rectangular, circular, triangular or multi-zone gravel volume, weight, material cost and bags with clear density and waste assumptions.

CalculatorsHeat Index CalculatorEstimate apparent temperature with the complete NWS screening and humidity-adjustment procedure, with conservative validity handling.

CalculatorsHeight CalculatorConvert human-height measurements into readable feet/inches and compare two heights with explicit signed and percentage differences.

CalculatorsHELOC CalculatorEstimate revolving credit capacity, drawn-balance payments and draw-to-repayment changes on a defined monthly HELOC timeline.

CalculatorsHex CalculatorPerform exact hexadecimal arithmetic, integer-base conversion and explicitly masked 8/16/32/64-bit operations with BigInt.

CalculatorsHome Equity Loan CalculatorEstimate a fixed-term second loan, combined LTV, fee financing and extra-principal savings without treating it as a revolving HELOC.

CalculatorsIP Subnet CalculatorAnalyze IPv4 and IPv6 network prefixes, exact address counts, masks, membership and bounded IPv4 subnet splits entirely locally.

CalculatorsHouse Affordability CalculatorEstimate a purchase-price ceiling from configured DTI limits, debts, available cash and price-dependent housing expenses.

CalculatorsIdeal Weight CalculatorCompare published adult historical reference-weight formulas with clear applicability limits and a separately labeled BMI reference interval.

CalculatorsIncome Tax CalculatorEstimate US 2026 federal or UK 2026–27 non-savings employment income tax, or build a worldwide custom progressive-bracket model.

CalculatorsIRR CalculatorSolve periodic IRR or actual/365 XIRR, identify multiple verified roots and compare investment cash-flow NPV without guessed returns.

CalculatorsLean Body Mass CalculatorCompare adult Boer, James and Hume lean-mass estimates with a separately entered body-fat-derived value, without treating regressions as measurements.

CalculatorsLog CalculatorEvaluate real logarithms and recover arguments or bases, with natural, common and binary modes and explicit numerical domain limits.

CalculatorsLove CalculatorCreate a deterministic, Unicode-aware playful name score locally, with clear entertainment-only meaning and no relationship predictions.

CalculatorsMacro CalculatorAllocate a user-selected daily calorie budget among protein, carbohydrate and fat, with percentage or g/kg planning and optional meal arithmetic.

CalculatorsMolarity CalculatorSolve concentration, moles, volume, solute mass or dilution using explicit solution-volume units and conservation-of-solute assumptions.

CalculatorsMolecular Weight CalculatorParse bounded chemical formulas, groups, hydrates and explicit charges with a versioned local CIAAW-based atomic-weight dataset.

CalculatorsMulch CalculatorEstimate garden mulch volume, whole bags and bag-versus-bulk material costs, with optional user-supplied density rather than gravel assumptions.

CalculatorsMutual Fund CalculatorCalculate fund units and NAV-based purchases, redemptions and values, with transparent loads and appropriate dated-return interpretation.

CalculatorsSIP CalculatorProject fixed or annual step-up SIP contributions, solve a nominal goal and compare inflation or separately funded lump-sum assumptions.

CalculatorsOne Rep Max CalculatorCompare bounded Epley, Brzycki, Lombardi and O’Conner lifting estimates, with observed one-rep handling and illustrative percentage loads.

CalculatorsOvulation CalculatorExplore calendar-based ovulation and fertile-window estimates with labeled cycle-length scenarios and an interactive calendar.

CalculatorsPace CalculatorCalculate pace, finish time, distance, race splits and cumulative segment progression with exact millisecond split totals.

CalculatorsPeriod CalculatorForecast menstrual start and inclusive end dates across cycles with an interactive calendar and explicit variability scenarios.

CalculatorsPregnancy CalculatorEstimate gestational age and due dates from LMP, clinical reference dating or embryo transfer, with a trimester timeline.

CalculatorsPregnancy Conception CalculatorWork backward from pregnancy dating references to an approximate fertilization anchor with a reversible dating timeline.

CalculatorsPregnancy Weight Gain CalculatorCompare entered pregnancy weight gain with published BMI-based total reference ranges and a clearly derived singleton illustration.

CalculatorsPresent Value CalculatorDiscount single amounts, annuities and dated cash flows using explicit payment and compounding frequencies.

CalculatorsProtein CalculatorCompare adult protein references and explicit g/kg assumptions with a range graphic and equal-meal arithmetic.

CalculatorsQuadratic Equation SolverSolve exact rational quadratic coefficients, distinguish real and complex roots and inspect an interactive polynomial graph.

CalculatorsRatio CalculatorSimplify exact ratios, solve proportions and allocate quantities with labeled part-to-whole comparison bars.

CalculatorsRefinance CalculatorCompare actual loan schedules, financed or upfront fees, cash-out and balance-adjusted break-even with interactive amortization and savings charts.

CalculatorsRemainder CalculatorFind exact signed integer quotients and remainders, compare Euclidean and truncation conventions and inspect long-division steps.

CalculatorsRent CalculatorExplore rent ranges constrained by take-home cash, household expenses and your chosen housing-percentage scenarios.

CalculatorsRent vs. Buy CalculatorCompare renting and buying with equal-funding investment portfolios, mortgage equity, selling costs and annual crossover scenarios.

CalculatorsResistor CalculatorDecode or encode four-, five- and six-band resistor colors and calculate ideal series or parallel resistance with labeled electrical diagrams.

CalculatorsRetirement CalculatorModel contributions, inflation-linked spending, pension income, funding gaps and portfolio depletion on a transparent retirement timeline.

CalculatorsRight Triangle CalculatorSolve sufficient side, angle, area or perimeter inputs and inspect a uniformly scaled right triangle, its angles and hypotenuse altitude.

CalculatorsRoman Numeral ConverterConvert integers and strictly validated canonical Roman numerals from 1 to 3999 with an interactive subtractive-symbol breakdown.

CalculatorsRoofing CalculatorEstimate gable, shed, simple hip or measured-section roof area, roof squares and whole material packages with pitch-aware geometry.

CalculatorsSalary CalculatorConvert eight pay frequencies and compare regular earnings, overtime, bonuses, leave and explicitly entered deductions.

CalculatorsScientific CalculatorEvaluate real scientific expressions with a safe parser, scientific keypad, DEG/RAD controls, memory and private calculation history.

CalculatorsScientific Notation CalculatorConvert and calculate exact decimal/E-notation values, compare scientific and engineering forms and inspect decimal-place movement.

CalculatorsShoe Size ConversionCompare approximate adult shoe-size mappings and explicitly sourced children’s chart rows with a foot-length measurement guide.

CalculatorsSleep CalculatorPlan bedtimes and wake times, compare sleep opportunities and inspect overnight schedules with explicit latency and offset assumptions.

CalculatorsSlope CalculatorExplore points and line equations, inspect rise/run geometry and compare vertical, horizontal, parallel and perpendicular lines.

CalculatorsSquare Footage CalculatorCombine dimensioned shapes and rooms, subtract explicit exclusions and estimate waste-adjusted coverage and whole material packages.

CalculatorsSquare Root CalculatorFind principal real or complex square roots, test exact rationality and inspect radical simplification, square grids and approximations.

CalculatorsStair CalculatorCompute integer risers, actual step heights and a defined n−1 tread flight with a dimensioned stair and stringer reference.

CalculatorsStandard Deviation CalculatorCalculate stable population and sample statistics, inspect observed-data dispersion and review centered deviations without assuming normality.

CalculatorsTarget Heart Rate CalculatorCompare maximum-heart-rate estimates or an entered measurement and inspect percentage-of-maximum versus heart-rate-reserve arithmetic.

CalculatorsTile CalculatorPlan rectangular tile surfaces with actual straight or staggered grid-piece counts, grout, edge cuts, waste and whole-box purchasing.

CalculatorsTime Card CalculatorAudit multiple shifts and breaks, detect overlaps, configure overtime and produce a printable weekly paid-hours and gross-pay report.

CalculatorsTime Zone ConverterConvert date-aware IANA local times, explicitly resolve repeated clocks and compare multi-location business-hour meeting options.

CalculatorsTip CalculatorReconcile pretax bill, tax, service charge and discretionary tip with exact minor-unit equal or custom-weight bill splits.

CalculatorsTire Size CalculatorCompare nominal radial passenger-tire dimensions, unloaded circumference, speedometer ratios and estimated ride-height changes.

CalculatorsTriangle CalculatorSolve general triangle input combinations, retain every valid SSA solution and inspect actual scaled geometry and altitudes.

CalculatorsTrigonometry CalculatorExplore trigonometric ratios, principal inverses, special-angle values and identities with a synchronized unit circle and discontinuity-aware graph.

CalculatorsVA Mortgage CalculatorEstimate a U.S. VA purchase-loan payment using the verified official funding-fee tiers, confirmed exemption status and a transparent amortization schedule.

CalculatorsVoltage Divider CalculatorCalculate unloaded and loaded divider voltages, referenced source current and resistor/load dissipation with an interactive circuit.

CalculatorsWatts to Amps CalculatorConvert real power to DC, single-phase RMS or balanced three-phase line current with explicit voltage and power-factor assumptions.

CalculatorsWeighted Average CalculatorCombine editable numeric values or grades with explicitly selected decimal or percentage weights and inspect each normalized contribution.

CalculatorsWind Chill CalculatorEvaluate the NWS wind-chill formula only within its stated temperature/wind domain and inspect a validity-aware sensitivity map.

CalculatorsWire Gauge CalculatorCompare AWG conductor geometry, copper/aluminum resistance at 20°C and an optional equal-outgoing/return DC voltage-drop estimate.

CalculatorsClick CounterManage independent named counters with custom increments, history, undo/redo, presentation mode and portable backups.

CalculatorsCountdown TimerRun independent named countdowns and repeating interval sequences from absolute deadlines with local session recovery.

CalculatorsScoreboardTrack configurable teams, scores, penalties, rounds and a game clock with undo, presets and match exports.

CalculatorsStopwatchMeasure elapsed time and lap splits with high-resolution runtime timing, notes, pace comparisons and local recovery.

CalculatorsCalendarPlan and organize events with a free online calendar featuring month, week, and day views, recurring schedules, time zones, printable calendars, and local backups. No signup required.

CalculatorsTake-Home Pay CalculatorEstimate annual take-home pay with 2026 US federal/FICA, 2026–27 UK income tax/NI, or user-defined worldwide tax rules.