Calculators
Quick everyday math — percentages, dates, health, and more.
13 tools in this category, all running locally in your browser.
Percentage Calculator
Calculate X% of Y, what percent one number is of another, and percent increase or decrease.
BMI Calculator
Calculate BMI from height and weight, with the World Health Organization category.
Age Calculator
Calculate exact age and total days lived from a date of birth.
Calorie Calculator
Enter your age, sex, height, weight, and activity level to estimate your BMR and daily calorie needs using the Mifflin-St Jeor equation.
Fuel Cost Calculator
Enter trip distance, your vehicle's fuel economy, and the fuel price to see the fuel needed and total cost of the journey.
Aspect Ratio Calculator
Enter an original width and height plus one new dimension, and get the matching dimension that preserves the aspect ratio.
Compound Interest Calculator
Project a final balance and total interest earned from a principal, rate, term, and compounding frequency.
Date Difference Calculator
Pick a start and end date to see the gap in days, weeks, months, and years.
Discount Calculator
Work out the final price and savings from a single discount or several stacked discounts.
Loan EMI Calculator
Work out the monthly EMI, total repayment, and total interest for any fixed-rate loan.
Random Number Generator
Pick a min, max, and how many numbers to generate — with an option to disallow duplicates.
Tip Calculator
Enter a bill, tip percentage, and number of people to see the tip, total, and per-person share.
Unit Price Calculator
Enter the price and quantity of two products to see which is cheaper per unit.