Free Online Calculators
Free online calculators for percentages, age, BMI, tips, loans, and more. Get accurate results instantly with no signup required.
Math & Numbers
Basic math, percentages, fractions, and statistics
Calculator
Free online calculator with basic and scientific modes. Arithmetic, trigonometry, logarithms, and more.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a number easily.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
GCD & LCM Calculator
Find greatest common divisor and least common multiple of numbers.
Mean, Median, Mode Calculator
Calculate central tendency measures for any data set.
Standard Deviation Calculator
Calculate standard deviation and variance for data sets.
Square Root Calculator
Calculate square roots, cube roots, and nth roots of numbers.
Prime Number Calculator
Check if numbers are prime and find prime factorizations.
Probability Calculator
Calculate event probability, odds, and combined probabilities.
Decimal to Fraction Calculator
Convert decimals to simplified fractions instantly. Shows step-by-step process.
Factorial Calculator
Calculate factorials (n!), double factorials, and subfactorials with step-by-step multiplication.
Exponent Calculator
Calculate powers, negative exponents, and fractional exponents with step-by-step solutions.
Logarithm Calculator
Calculate log base 10, natural log (ln), and custom base logarithms.
Finance & Money
Loans, investments, budgeting, and financial planning
Loan Calculator
Calculate monthly payments, total interest, and amortization for loans.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule.
Compound Interest Calculator
Calculate investment growth with compound interest and monthly contributions.
Simple Interest Calculator
Calculate simple interest for loans and investments with comparison to compound.
Savings Calculator
Plan your savings goals with future value calculations and time-to-goal estimates.
ROI Calculator
Calculate return on investment percentage and annualized returns.
Inflation Calculator
See how inflation affects purchasing power over time. Calculate future and past values.
Currency Converter
Convert between major world currencies with approximate exchange rates.
Retirement Calculator
Plan your retirement savings, estimate how much you need, and calculate monthly contributions.
Down Payment Calculator
Calculate how much to save for a home down payment and time needed to reach your goal.
Debt Payoff Calculator
Calculate time to pay off debt, total interest, and compare different payment strategies.
Net Worth Calculator
Track assets, liabilities, and calculate your total net worth. Monitor financial health.
Health & Fitness
BMI, calories, fitness metrics, and health calculations
BMI Calculator
Calculate your Body Mass Index and check if you're in a healthy weight range.
Calorie Calculator
Calculate daily calorie needs for weight loss, maintenance, or muscle building.
BMR Calculator
Calculate your basal metabolic rate - calories burned at rest.
TDEE Calculator
Calculate total daily energy expenditure based on activity level.
Ideal Weight Calculator
Calculate ideal body weight using multiple scientific formulas.
Body Fat Calculator
Estimate body fat percentage using the US Navy method.
Protein Calculator
Calculate daily protein needs based on weight and fitness goals.
Water Intake Calculator
Calculate daily water needs based on weight, activity, and climate.
Due Date Calculator
Calculate pregnancy due date from last period or conception. Track weeks and trimesters.
Pace Calculator
Calculate running pace, time, or distance. Plan your races with pace estimates.
Date & Time
Age, date differences, time zones, and scheduling
Age Calculator
Calculate your exact age in years, months, and days from your birth date.
Date Difference Calculator
Calculate the exact time between two dates in years, months, weeks, and days.
Days Until Calculator
Count down days until a future date or days since a past date.
Hours Calculator
Calculate hours and minutes between two times for work shifts and timesheets.
Time Duration Calculator
Add or subtract multiple time durations in hours, minutes, and seconds.
Work Days Calculator
Count business days between dates excluding weekends and holidays.
Weekday Calculator
Find what day of the week any date falls on - past, present, or future.
Time Zone Converter
Convert times between cities worldwide. Plan meetings across time zones easily.
Unit Conversion
Length, weight, temperature, and unit conversions
Length Converter
Convert between meters, feet, inches, miles, kilometers, and more distance units.
Weight Converter
Convert between kilograms, pounds, ounces, grams, stones, and more mass units.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin temperature scales.
Volume Converter
Convert between liters, gallons, cups, fluid ounces, and more volume units.
Area Converter
Convert between square meters, square feet, acres, hectares, and more area units.
Speed Converter
Convert between mph, km/h, m/s, knots, and more velocity units.
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and binary units like KiB, MiB, GiB.
Pressure Converter
Convert between psi, bar, pascal, atm, mmHg, and more pressure units.
Energy Converter
Convert between joules, calories, kWh, BTU, and more energy units.
Angle Converter
Convert between degrees, radians, gradians, turns, and arc measurements.
Science & Engineering
Physics, chemistry, and engineering calculations
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR).
Voltage Calculator
Calculate voltage using Ohm's Law or voltage divider formula for circuits.
Resistor Color Code Calculator
Decode 4-band and 5-band resistor color codes to find resistance values.
Wavelength Calculator
Calculate wavelength, frequency, and wave speed for light and sound waves.
Density Calculator
Calculate density, mass, or volume from the other two values. Common material densities included.
Force Calculator
Calculate force, mass, or acceleration using Newton's Second Law (F=ma).
Acceleration Calculator
Calculate acceleration, velocity, or time using kinematic equations.
Molarity Calculator
Calculate molarity, moles, volume, or mass for chemistry solutions.
Business & Work
Salary, margins, productivity, and business metrics
Salary Calculator
Convert between annual, monthly, weekly, and hourly pay rates.
Hourly to Salary Calculator
Convert hourly wage to annual salary and see equivalent pay periods.
Profit Margin Calculator
Calculate gross margin, net margin, and profit from cost and revenue.
Markup Calculator
Calculate selling price from cost and markup percentage.
Break-Even Calculator
Calculate break-even point in units and revenue for your business.
Paycheck Calculator
Estimate take-home pay after taxes and deductions.
Commission Calculator
Calculate sales commission with simple or tiered rate structures.
Overtime Calculator
Calculate overtime pay at 1.5x and 2x rates for weekly earnings.
Everyday Life
Tips, discounts, cooking, fuel, and daily calculations
Tip Calculator
Calculate tips for restaurants and services, with bill splitting options.
Discount Calculator
Calculate sale price, savings amount, and final price after discount.
Sales Tax Calculator
Calculate tax amount and total price. Supports reverse tax calculation.
Split Bill Calculator
Split restaurant bills and expenses evenly with tip calculation.
Fuel Cost Calculator
Estimate gas costs for trips based on distance, MPG, and fuel price.
MPG Calculator
Calculate your vehicle's fuel efficiency from distance and fuel used.
GPA Calculator
Calculate your grade point average from courses and credits.
Grade Calculator
Calculate course grade from weighted categories and find needed final exam score.
Cooking Converter
Convert cups, tablespoons, teaspoons, milliliters, and ounces. Kitchen measurement tool.
Recipe Scaler
Scale recipe ingredients up or down. Enter servings for instant conversions.
Electricity Cost Calculator
Calculate running costs for appliances. Estimate daily, monthly, and yearly energy expenses.
Square Footage Calculator
Calculate area for rooms, flooring, and painting. Multiple shapes supported.
What Are Online Calculators?
Online calculators are digital tools that perform mathematical computations instantly. From simple percentage calculations to complex loan amortization schedules, these tools save time and reduce errors compared to manual calculations.
Calculator Categories
- Math & Numbers - Percentages, fractions, statistics, and basic math operations
- Finance & Money - Loans, mortgages, investments, and compound interest
- Health & Fitness - BMI, calories, BMR, and fitness calculations
- Date & Time - Age calculations, date differences, and time conversions
- Unit Conversion - Length, weight, temperature, and more unit conversions
- Science & Engineering - Physics, chemistry, and engineering formulas
- Business & Work - Salary, margins, and business metrics
- Everyday Life - Tips, discounts, fuel costs, and daily calculations
Why Use Our Calculators?
Our calculators provide instant, accurate results without requiring any signup or downloads. All calculations happen in your browser, ensuring your financial and personal data stays private. They work on any device - desktop, tablet, or mobile.