Free Online Calculators
Fast, accurate, and ad-free calculators for math, finance, health, and everyday life. Real-time results, shareable URLs, and dark mode built in.
Math Calculators
View all →Percentage Calculator
Calculate percentages instantly. Find what percent of a number is, percentage increase/decrease, and more.
Random Number Generator
Generate random numbers within any range. Perfect for games, decisions, and statistical sampling.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Get results as simplified fractions, mixed numbers, and decimals.
Finance Calculators
View all →Compound Interest Calculator
Calculate compound interest on savings and investments. See how your money grows over time with monthly or annual compounding.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and view amortization schedules for home loans.
Salary Calculator
Convert between annual salary, monthly pay, and hourly wage. Compare pay across different periods.
Health Calculators
View all →BMI Calculator
Calculate your Body Mass Index (BMI) to check if your weight is healthy. Supports both metric and imperial units.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Enter your measurements for an accurate assessment.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) based on your BMR and activity level. Plan your calorie intake for weight goals.
Calorie Calculator
Calculate daily calorie needs using the Mifflin-St Jeor equation. Find calories for weight loss, maintenance, and gain.
Sleep Calculator
Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Wake up feeling refreshed.
Everyday Calculators
View all →Age Calculator
Calculate your exact age in years, months, and days. Find the time between any two dates.
Tip Calculator
Calculate the right tip amount and split the bill between friends. Supports custom tip percentages.
GPA Calculator
Calculate your GPA on a 4.0 scale. Add courses with grades and credit hours for an accurate cumulative GPA.
Date Calculator
Calculate the number of days between two dates or add/subtract days from a date. Includes business days option.
Discount Calculator
Calculate sale prices, percent off savings, and reverse-calculate original prices from discounted amounts.
Unit Converter
Convert between units of length, weight, volume, and temperature. Metric and imperial conversions.
Time Zone Converter
Convert time between world time zones. Schedule international meetings across regions.
Password Generator
Generate strong, secure random passwords. Customize length and character types with strength analysis.
Why Use Our Calculators?
Our calculators are built for speed, accuracy, and ease of use. Every tool calculates results in real time as you type — no submit buttons, no page reloads. Each calculator shows the formula and step-by-step breakdown so you understand the math behind the answer.
Unlike other calculator sites, we don't clutter the page with ads or require signups. Share any calculation via URL — the link pre-fills your inputs and shows the result instantly. Works on desktop, tablet, and mobile with full keyboard accessibility and dark mode support.
All calculators are free, open, and built with modern web standards for sub-second page loads. Whether you need a quick percentage calculation, want to check your BMI, or are planning compound interest on your savings, we have the right tool.