Tools
Age Calculator
Calculate exact age in years, months and days between a birth date and any date, plus total days, weeks and the countdown to the next birthday.
Aspect Ratio Calculator
Scale width and height while keeping the same aspect ratio — perfect for images and video. Shows the simplified ratio such as 16:9.
Average Order Value (AOV) Calculator
Calculate your average order value and see how small AOV increases compound into big revenue gains.
BMI Calculator
Calculate your Body Mass Index from height and weight, in metric or imperial units, and see your WHO weight category instantly.
Break-Even Point Calculator
Find how many units you must sell to cover costs, from fixed costs, price per unit, and variable cost per unit. See break-even units and revenue instantly.
Compound Interest Calculator
Calculate the future value of your investments with compound interest. See how regular monthly contributions grow over time.
Discount Calculator
Calculate the sale price and amount saved from an original price and a percentage discount. Stack two discounts and see the effective discount rate.
Ecommerce Transaction Fee Calculator
See how much ecommerce platform transaction fees cost you per year — and how much you'd keep on a 0% platform. Compare Shopify, BigCommerce, WooCommerce and more.
Loan Payment Calculator
Estimate your monthly loan payment, total interest, and total cost from the loan amount, annual rate, and term in years.
MRR & ARR Calculator
Calculate monthly and annual recurring revenue from your subscriber count and average plan price, and project MRR 12 months out with churn and growth.
Password Generator
Generate strong, random passwords with control over length, symbols, numbers and case. Runs entirely in your browser — nothing is sent anywhere.
Percentage Calculator
Work out percentages every way: X percent of Y, what percent X is of Y, and percentage increase or decrease. Fast, free, and 100% in your browser.
Have a useful tool? You can contribute interactive calculators, converters, or utilities. See the contribution guide for how to submit your tool via GitHub Pull Request.