Free online calculators & everyday tools
OmniTools is a growing collection of fast, accurate online calculators. No sign-up, no installs — every calculation runs privately in your browser.
Popular tools
🎂Age CalculatorFree age calculator. Enter your date of birth to find your exact age in years, months, days, hours and your next birthday countdown.⚖️BMI CalculatorFree BMI calculator for adults. Enter height and weight in metric or imperial units to find your Body Mass Index and weight category.％Percentage CalculatorFree percentage calculator. Work out what percent of a number, percentage increase or decrease, and the percentage change between two values.🏦Loan CalculatorFree loan calculator. Estimate your monthly payment, total interest and payoff for personal, auto and student loans from the amount, rate and term.🏡Mortgage CalculatorFree mortgage calculator. Estimate your monthly home loan payment, total interest and payoff from the price, down payment, rate and term.📈Compound Interest CalculatorFree compound interest calculator. See how savings and investments grow over time with regular contributions and compounding.
Finance
View all →Loans, interest, tips and savings — money math made simple.
🏦Loan CalculatorFree loan calculator. Estimate your monthly payment, total interest and payoff for personal, auto and student loans from the amount, rate and term.🏡Mortgage CalculatorFree mortgage calculator. Estimate your monthly home loan payment, total interest and payoff from the price, down payment, rate and term.📈Compound Interest CalculatorFree compound interest calculator. See how savings and investments grow over time with regular contributions and compounding.🧾Tip CalculatorFree tip calculator. Work out the gratuity on any bill, split it between people, and see the total per person in seconds.🏷️Discount CalculatorFree discount calculator. Enter the original price and percent off to see the sale price and exactly how much you save.
Health
View all →Body, fitness and pregnancy calculators for everyday wellbeing.
⚖️BMI CalculatorFree BMI calculator for adults. Enter height and weight in metric or imperial units to find your Body Mass Index and weight category.🤰Pregnancy Due Date CalculatorFree pregnancy due date calculator. Estimate your baby's due date and current week from your last menstrual period (LMP).🍎Calorie CalculatorFree calorie calculator. Estimate your daily calorie needs (TDEE) and BMR to maintain, lose or gain weight using the Mifflin-St Jeor equation.
Date & Time
View all →Work out ages, durations and the time between two dates.
🎂Age CalculatorFree age calculator. Enter your date of birth to find your exact age in years, months, days, hours and your next birthday countdown.📆Date Difference CalculatorFree date difference calculator. Find the number of days, weeks, months and years between any two dates, with or without counting the end day.⏱️Hours CalculatorFree hours calculator. Work out the time between two times, subtract breaks, and optionally calculate pay — perfect for timesheets and work hours.
Math
View all →Percentages and quick everyday number crunching.
Converters
View all →Currency, units, temperature — convert anything in a tap.
💱Currency ConverterFree currency converter with daily exchange rates for USD, EUR, GBP, JPY and 25+ currencies. Convert any amount instantly in your browser.📐Unit ConverterFree unit converter for length, weight, volume, speed, area and data. Switch between metric and imperial units instantly.🌡️Temperature ConverterFree temperature converter. Convert between Celsius, Fahrenheit and Kelvin instantly — see all three at once.