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AllCalculator

All Free Online Calculators

Browse our complete library of 75+ free online calculators. Search by name or filter by category.

Showing 75 of 75 calculators

Financial

Mortgage Calculator

Free mortgage calculator to estimate monthly home loan payments, principal, interest, and total cost. Adjust down payment, term, and rate instantly.

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Financial

Loan Calculator

Free loan calculator for personal, auto, and student loans. Enter amount, rate, and term to see monthly payment, total interest, and total repayment cost.

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Financial

EMI Calculator

Free EMI calculator to compute equated monthly installments for home, car, and personal loans. See principal vs interest split and total repayment in seconds.

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Financial

Compound Interest Calculator

Free compound interest calculator to see how investments grow over time. Enter principal, rate, time, and compounding frequency to find your final amount.

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Financial

Simple Interest Calculator

Free simple interest calculator. Quickly find interest and total amount using SI = (P x R x T)/100 for loans, deposits, and short-term finance in seconds.

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Financial

Tip Calculator

Free tip calculator to split bills and tips fairly. Enter bill total, tip percentage, and number of people for per-person totals. Quick preset buttons included.

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Financial

Discount Calculator

Free discount calculator to find sale prices and savings instantly. Enter original price and discount percent or amount. Reverse mode finds the percentage off.

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Financial

GST Calculator

Free GST calculator to add or remove Goods and Services Tax. Toggle inclusive or exclusive mode and choose 5%, 12%, 18%, 28%, or a custom rate instantly.

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Financial

Salary Calculator

Free salary calculator to convert pay across hourly, daily, weekly, bi-weekly, monthly, and annual amounts. See all equivalent pay rates from any one input.

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Financial

Savings Calculator

Free savings calculator. Enter initial deposit, monthly contribution, interest rate, and years to project your future balance, total deposits, and interest earned.

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Financial

Investment Calculator

Free investment calculator. Enter initial amount, annual return, period, and optional monthly additions to see future value, total invested, returns, and CAGR.

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Financial

ROI Calculator

Free ROI calculator. Enter net profit and cost of investment to compute your return on investment percentage, return ratio, and profit per dollar invested.

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Financial

Inflation Calculator

Free inflation calculator. Enter an amount, annual inflation rate, and years to see the future value needed, purchasing power lost, and the loss in percent.

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Financial

Retirement Calculator

Free retirement calculator. Enter your current age, savings, monthly contribution, and expected return to project savings at retirement and monthly retirement income.

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Financial

Profit Margin Calculator

Free profit margin calculator with gross, net, and markup modes. Enter revenue and cost figures to find your margin percentage and profit amount instantly.

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Financial

Break-Even Calculator

Free break-even calculator. Enter fixed costs, variable cost per unit, and selling price to find break-even units, break-even revenue, and contribution margin.

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Financial

Credit Card Payoff Calculator

Free credit card payoff calculator. Enter balance, APR, and monthly payment to see months to pay off, total interest, and payments needed to clear it faster.

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Financial

Currency Converter

Free currency converter. Convert amounts between USD, EUR, GBP, JPY, INR, AED, CAD, AUD, CHF, CNY, SGD, SAR, MYR, PKR and BDT using static reference rates.

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Financial

Auto Loan Calculator

Free auto loan calculator. Enter car price, down payment, trade-in, term, and rate to see your monthly payment, amount financed, total interest, and total cost.

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Financial

Business Loan Calculator

Free business loan calculator. Enter loan amount, interest rate, and term to find your monthly payment, total interest, and total repayment for your business.

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Health

BMI Calculator

Free BMI calculator. Enter your height and weight to instantly compute your Body Mass Index and see where you fall on the WHO weight classification scale.

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Health

BMR Calculator

Free BMR calculator using the Mifflin-St Jeor equation. Enter age, weight, height and gender to estimate calories you burn at complete rest each day.

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Health

Calorie Calculator

Free daily calorie calculator. Enter your age, weight, height, gender, and activity level to estimate the calories you need each day to maintain, lose, or gain weight.

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Health

Body Fat Calculator

Free body fat percentage calculator using U.S. Navy method. Enter neck, waist, and hip measurements to estimate your body composition without calipers.

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Health

Ideal Weight Calculator

Free ideal weight calculator using multiple formulas (Robinson, Miller, Devine, Hamwi). Enter height and gender to find your healthy weight range.

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Health

Water Intake Calculator

Free water intake calculator. Enter your weight, exercise duration, and climate to estimate how many ounces or liters of water you should drink each day.

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Health

Pregnancy Due Date Calculator

Free pregnancy due date calculator. Enter the first day of your last period or your conception date to estimate your baby due date and see your trimesters.

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Health

Ovulation Calculator

Free ovulation calculator. Enter your last period date and cycle length to estimate your fertile window, ovulation day, and the best days for conception.

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Health

Sleep Calculator

Free sleep calculator to help you sync your bedtime or wake time with natural 90-minute sleep cycles for better rest and easier waking.

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Health

Heart Rate Calculator

Free heart rate calculator to find your maximum, resting, and training heart rate zones. Useful for optimizing cardio and tracking cardiovascular fitness.

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Health

TDEE Calculator

Free TDEE calculator. Enter your details and activity to find Total Daily Energy Expenditure — the calories you actually burn in a full day.

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Health

Macro Calculator

Free macronutrient calculator. Enter your calorie goal and dietary preference to split those calories into optimal grams of protein, carbohydrates, and fat.

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Health

Waist-to-Hip Ratio Calculator

Free waist-to-hip ratio calculator. Enter your waist and hip measurements to estimate your body shape and cardiovascular risk outlook.

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Health

Lean Body Mass Calculator

Free lean body mass calculator. Enter total weight and body fat percentage to find how many pounds or kilos of muscle, bone, and organ tissue you carry.

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Health

Calories Burned Calculator

Free calories burned calculator for 50+ activities. Enter your weight and duration to estimate how many calories running, walking, biking and more burn.

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Math

Percentage Calculator

Free percentage calculator for all common percentage problems: what percent of X is Y, X percent of Y, and percentage change between two numbers.

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Math

Fraction Calculator

Free fraction calculator to add, subtract, multiply, divide, simplify, and convert fractions with proper step-by-step results shown instantly.

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Math

Average Calculator

Free average calculator. Enter any number of values to instantly compute the mean, median, and mode of your data set.

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Math

Scientific Calculator

Free online scientific calculator with trigonometric, logarithmic, exponential, and power functions. Perfect for students and engineers — works in your browser.

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Math

Quadratic Equation Solver

Free quadratic equation solver for ax² + bx + c = 0. Enter coefficients to find real or complex roots with the quadratic formula, instantly.

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Math

Ratio Calculator

Free ratio calculator to simplify ratios, find missing values in equivalent ratios, and compare two ratios directly.

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Math

Area Calculator

Free area calculator for squares, rectangles, triangles, circles, parallelograms, trapezoids, and more. Get area in any unit instantly.

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Math

Volume Calculator

Free volume calculator for cubes, boxes, cylinders, spheres, cones, and more. Calculate capacity in liters, gallons, and cubic units instantly.

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Math

Pythagorean Theorem Calculator

Free Pythagorean theorem calculator. Enter two sides of a right triangle to find the missing side with a² + b² = c² instantly.

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Math

Prime Number Checker

Free prime number checker. Enter any integer to instantly determine whether it is prime and see its prime factors.

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Math

LCM & GCD Calculator

Free LCM and GCD calculator. Enter two or more numbers to find their least common multiple and greatest common divisor instantly.

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Math

Statistics Calculator

Free statistics calculator that computes mean, median, mode, range, variance, and standard deviation for any list of numbers.

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Date & Time

Age Calculator

Free age calculator. Enter your birth date to instantly see your exact age in years, months, and days plus the next birthday countdown.

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Date & Time

Date Difference Calculator

Free date difference calculator. Enter two dates to find the exact span between them in years, months, weeks, days, hours, and minutes.

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Date & Time

Days Between Dates

Free days between dates calculator. Quickly find exactly how many days are between any two calendar dates, including today.

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Date & Time

Working Days Calculator

Free working days calculator. Count business days between two dates, excluding weekends and optional holidays, for accurate project planning.

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Date & Time

Time Zone Converter

Free time zone converter. Convert a time from any city or time zone to another, with automatic offset handling for major world time zones.

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Date & Time

Week Number Calculator

Free week number calculator. Find the ISO week number for any date, plus how many weeks into the year that date falls.

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Date & Time

Countdown Calculator

Free countdown calculator. Pick a target date and see exactly how many days, hours, minutes, and seconds remain until the big moment.

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Date & Time

Day of the Week Calculator

Free day of the week calculator. Enter any date to instantly find what day of the week it fell on — from any year, past or future.

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Converters

Length Converter

Free length converter for meters, feet, inches, miles, kilometers, yards, and centimeters. Convert any measurement between units instantly.

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Converters

Weight Converter

Free weight converter for kilograms, pounds, grams, ounces, stones, and tons. Convert any mass measurement between units instantly.

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Converters

Temperature Converter

Free temperature converter for Celsius, Fahrenheit, and Kelvin. Convert temperatures precisely between all three scales instantly.

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Converters

Speed Converter

Free speed converter for mph, km/h, knots, meters per second, and more. Convert any speed measurement between units instantly.

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Converters

Area Converter

Free area converter for square meters, square feet, acres, hectares, and more. Convert any area measurement between units instantly.

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Converters

Volume Converter

Free volume converter for liters, gallons, cups, milliliters, cubic meters, and more. Convert any capacity measurement between units instantly.

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Converters

Data Storage Converter

Free data storage converter for bytes, kilobytes, megabytes, gigabytes, terabytes, and more. Convert digital storage instantly.

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Converters

Pressure Converter

Free pressure converter for psi, bar, pascals, atmospheres, and more. Convert any pressure measurement between units instantly.

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Converters

Energy Converter

Free energy converter for joules, calories, kilowatt-hours, BTUs, and more. Convert any energy measurement between units instantly.

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Converters

Fuel Consumption Converter

Free fuel consumption converter for MPG, liters per 100 km, km per liter, and more. Convert fuel efficiency instantly.

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Tools

GPA Calculator

Free GPA calculator. Add your courses, grades, and credit hours to instantly compute your semester or cumulative grade point average.

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Tools

Grade Calculator

Free grade calculator. Enter your assignments, weights, and scores to find your current grade and what you need on the final exam.

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Tools

Random Number Generator

Free random number generator. Generate one or many random numbers within any range, with optional uniqueness and decimal support.

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Tools

Password Generator

Free secure password generator. Create strong random passwords with adjustable length and character sets. Works offline in your browser.

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Tools

Word Counter

Free word counter. Paste any text to instantly count words, characters, sentences, paragraphs, and estimated reading time.

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Tools

Reading Time Calculator

Free reading time calculator. Estimate how long it takes to read any text or word count, with adjustable reading speed.

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Tools

Number to Words Converter

Free number to words converter. Convert any number up to billions into English words instantly — perfect for checks, invoices, and documents.

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Tools

Hex to Decimal Converter

Free hex to decimal converter. Convert between hexadecimal, decimal, binary, and octal number systems instantly, with base prefixes explained.

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Tools

Roman Numeral Converter

Free Roman numeral converter. Convert numbers to Roman numerals and back, following the standard subtractive rules like IV and IX.

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Tools

Probability Calculator

Free probability calculator for single, multiple, and conditional events. Find the chance of independent and dependent outcomes quickly.

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