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
Clear Results
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.
Square Footage Calculator
Calculate project area for rooms, floors, walls and home-improvement planning.
Loan Calculator
Estimate loan payments, total interest and repayment cost.
Age Calculator
Find age in years, months and days from a birth date.
Percentage Calculator
Find percentages, percentage changes and percentage differences.
Graphing Calculator
Plot functions, inspect coordinates and explore equations on an interactive graph.
Popular Calculator Categories
Explore all →
AutomotiveMileage, fuel, EV, ownership & vehicle specs
Business & AccountingProfit, pricing, cash flow & accounting ratios
ChemistryFormulas, moles, reactions, solutions & analysisConversionUnits, length, weight & more
Date & TimeAge, dates, time & duration
Debt & CreditPayoff plans, cards, consolidation & refinancingDigital Marketing & AdvertisingAd costs, campaigns, funnels, email & social
Education & StudentGPA, grades, credits & college planning
Farm & LivestockFeed, forage, herds, dairy, poultry & storageFinanceLoans, mortgages & interestFood & CookingRecipes, portions, ratios, cost & cooking time
Health & FitnessBMI, calories & wellnessHome & ConstructionArea, materials, roofing & projectsInsuranceAuto, home, life, health, travel, business & specialty coverage planningMathPercentages, algebra & formulasPetDog & cat age, nutrition, care costs & pregnancyPhysics & EngineeringMechanics, motion, energy, electricity & machinesPregnancy & BabyDue dates, fertility, pregnancy timing & child growthReal Estate & PropertyMortgages, taxes, equity, buying & investingRetirement & InvestingIRAs, portfolio growth, income, withdrawals & FIRESports & 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 energy
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.