Free online calculator tools
Free Online Calculator
Tools for Every Need
Use simple online calculators for math, finance, health, percentages, age and everyday calculations. Enter your values, calculate, and get clear results in seconds.
Fast & Easy
Mobile Friendly
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Popular Calculators
View all calculators →BMI Calculator
Calculate Body Mass Index using height and weight.
Mortgage Calculator
Estimate monthly home loan payments, interest and principal.
Calorie Calculator
Estimate daily calorie needs for common health and fitness goals.
Loan Calculator
Estimate loan payments, total interest and repayment cost.
Tip Calculator
Calculate a restaurant tip, total bill and amount per person.
Compound Interest Calculator
Project investment growth from principal, rate, time and contributions.
Age Calculator
Find age in years, months and days from a birth date.
Tax Calculator
Estimate U.S. federal income tax from income, deductions and credits.
Percentage Calculator
Find percentages, percentage changes and percentage differences.
Time Calculator
Calculate elapsed time and duration using hours, minutes and seconds.
Popular Calculator Categories
Explore all →
Astronomy & SpacePlanets, orbits, rockets, telescopes, stars & exoplanetsAutomotiveMileage, fuel, EV, ownership & vehicle specs
Business & AccountingProfit, pricing, cash flow & accounting ratios
ChemistryFormulas, moles, reactions, solutions & analysisClothing, Footwear & SizingShoes, apparel, children’s sizes, rings & accessoriesConversionUnits, length, weight & moreCryptocurrency & BlockchainProfit, DCA, staking, mining, tokens & portfolios
Date & TimeAge, dates, time & duration
Debt & CreditPayoff plans, cards, consolidation & refinancingDigital Marketing & AdvertisingAd costs, campaigns, funnels, email & social
Education & StudentGPA, grades, credits & college planning
Event & Wedding PlanningBudgets, guests, venues, supplies, staffing & timelinesFarm & LivestockFeed, forage, herds, dairy, poultry & storageFinanceLoans, mortgages & interestFood & CookingRecipes, portions, ratios, cost & cooking timeGaming & EsportsSensitivity, eDPI, K/D, FPS, damage, ranks & progression
Gardening & LandscapingSoil, lawns, planting, materials, irrigation & rainwaterHealth & FitnessBMI, calories & wellnessHome & ConstructionArea, materials, roofing & projectsInsuranceAuto, home, life, health, travel, business & specialty coverage planningManufacturing & IndustrialOEE, capacity, quality, reliability & lean productionMathPercentages, algebra & formulasMedical & ClinicalKidney, labs, cardiovascular measures & clinical scoresMoving & RelocationCosts, packing, trucks, storage, labor & schedulesMusic & AudioTempo, pitch, songs, acoustics, speakers & instrumentsPetDog & cat age, nutrition, care costs & pregnancyPhotography & ImagingExposure, focus, lenses, flash, macro & capture planningPhysics & EngineeringMechanics, motion, energy, electricity & machinesPregnancy & BabyDue dates, fertility, pregnancy timing & child growthProductivity & Time ManagementTime budgets, meetings, focus, goals, deadlines, projects & calendar buffersReal Estate & PropertyMortgages, taxes, equity, buying & investingRetirement & InvestingIRAs, portfolio growth, income, withdrawals & FIREShipping & LogisticsParcels, freight, pallets, containers & costsShopping & Everyday SavingsDiscounts, unit prices, coupons, rewards, groceries & everyday valueSleep & WellnessBedtime, duration, efficiency, diaries, naps, shifts & caffeine timingSports & PerformanceRunning, cycling, swimming, scoring & powerStatisticsData, probability, inference & relationshipsTax & PaycheckTaxes, paychecks & take-home pay
Technology & ComputingInternet, screens, media, batteries & networksTravelBudgets, trips, flights, hotels, currency & time
Utilities & EnergyElectricity, solar, appliances & home energyWeather & ClimateHeat, cold, humidity, storms, snow & pressureWriting, Reading & TextWord counts, reading time, typing, pages, captions & readability
Instant ResultsSimple inputs and fast browser-based calculations.
Easy to UseClean forms designed to make calculations straightforward.
Works EverywhereResponsive layouts for phones, tablets and desktop screens.
Built for ClarityReadable result layouts with helpful labels and descriptions.