Get Started Free
Free online calculator tools

Free Online Calculators with Step-by-Step Explanations

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
0

Functions & history

More scientific functions

Use brackets for functions: sin(30), sqrt(81). Inv switches sin/cos/tan to asin/acos/atan, ln to exp, log to 10ˣ and √ to square. Inverse trig answers follow Deg/Rad. Hyperbolic functions use numeric arguments.

EXP enters E for scientific notation: 1.2E3 = 1200. Percent divides the preceding value by 100: 200×10% = 20; 200+10% = 200.1. Powers associate right: 2^3^2 = 512; −2^2 = −4. Factorial: whole numbers 0–170. Use explicit multiplication when grouping is ambiguous.

Enter or = calculates; Escape clears. Expressions can scroll horizontally. Answers show up to 12 significant digits with scientific notation when needed. Calculations use floating-point arithmetic, so large integers and decimal fractions may not be exact. Finite real-number calculations only; no symbolic algebra, units or complex numbers. Maximum expression length: 512 characters.

Ans holds the last successful result. AC clears the screen; MC clears memory. Memory and the last five results last only while this page stays open.

Recent results

    For a specialized calculation, browse all calculators.

    Full scientific tool ↗
    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  →
    FinanceLoans, mortgages & interest Health & FitnessBMI, calories & wellness MathPercentages, algebra & formulas Home & ConstructionArea, materials, roofing & projects Date & TimeAge, dates, time & duration ConversionUnits, length, weight & more AutomotiveMileage, fuel, EV, ownership & vehicle specs Tax & PaycheckTaxes, paychecks & take-home pay Food & CookingRecipes, portions, ratios, cost & cooking time Education & StudentGPA, grades, credits & college planning Real Estate & PropertyMortgages, taxes, equity, buying & investing Debt & CreditPayoff plans, cards, consolidation & refinancing TravelBudgets, trips, flights, hotels, currency & time Shopping & Everyday SavingsDiscounts, unit prices, coupons, rewards, groceries & everyday value Technology & ComputingInternet, screens, media, batteries & networks Weather & ClimateHeat, cold, humidity, storms, snow & pressure PetDog & cat age, nutrition, care costs & pregnancy Retirement & InvestingIRAs, portfolio growth, income, withdrawals & FIRE Electrical & ElectronicsLED resistors, voltage dividers & circuits
    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.