Free Online Calculators: EMI, GST, Age, BMI and More — All in One Place
Almost every week there is some small calculation to do — a loan EMI to check before visiting the bank, GST to add on a bill, an exact age to fill in a form, or a percentage to work out for an exam or a discount. Searching for a separate app or website for each one wastes time. ToolNest keeps all of these calculators on one page, free, with no signup — and every calculation happens inside your browser.
Money calculators
Planning a bike, phone or home loan? The EMI Calculator shows your monthly instalment, total interest and total payment for any loan amount, rate and tenure — check it before you sign anything. You can cross-check the figures on Calculator.net loan calculator or Paisabazaar home loan EMI calculator. Shopkeepers and freelancers can use the GST Calculator to add or remove GST (5%, 12%, 18%, 28%) from any amount in one step. The current slabs are published on the official GST portal. For offers and sale prices, the Discount Calculator tells you the final price and how much you save, and the Percentage Calculator handles marks, percentage increase/decrease and "what percent of" questions (compare with Calculator.net percent calculator).
Everyday calculators
Forms often ask for your exact age in years, months and days. The Age Calculator works it out from your date of birth instantly — useful for exam forms, job applications and documents. The Date Difference Calculator counts the days between any two dates, much like the timeanddate duration calculator, and the BMI Calculator gives your Body Mass Index from height and weight, with the standard weight category, as defined by the WHO.
Converters and helpers
The Unit Converter converts length, weight, temperature and more (see NIST weights and measures for the official standards). Number to Words writes any number in English words — handy for cheques and invoices — and the Number Converter converts between decimal, binary, octal and hexadecimal for students and developers. Need a lucky draw or a random pick? The Random Number Generator does it fairly, using the same idea as RANDOM.ORG. Designers can also grab exact shades with the Color Picker.
Common questions
Are these calculators free? Yes, completely free and unlimited — no account, no watermark, nothing to install.
Is my data sent anywhere? No. Every calculator runs in your browser on your own device, so the numbers you type never leave your phone or computer.
Which calculator do students use most? The Percentage Calculator and Age Calculator — for marks and for exam application forms.