About OnlineCalculator.click

OnlineCalculator.click is an independent website offering 23 free calculators for personal finance, health and fitness, mathematics and everyday tasks. Our goal is simple: give anyone a fast, accurate answer – and a clear explanation of how that answer was reached – without sign-ups, downloads or clutter.

How we build our calculators

Every calculator is based on standard, widely published formulas – the annuity formula for loans, the Mifflin-St Jeor equation for metabolic rate, the U.S. Navy circumference method for body fat, Naegele's rule for due dates, and so on. Each page explains the formula, its assumptions and its limitations in plain English. We test every tool against hand-worked examples and independent references before it is published, and we review pages regularly.

Privacy first

All calculations run locally in your web browser. The numbers you type – your salary, weight, date of birth or anything else – are never sent to our servers. Read our Privacy Policy for details about cookies and advertising.

How the site is funded

OnlineCalculator.click is free to use. To cover hosting and development we may show advertising, including ads served by Google. Ads never change how a calculator works or what result it gives.

Important note

Our calculators provide estimates for educational and planning purposes. They are not a substitute for advice from a qualified financial adviser, doctor, lawyer or other professional.

Get in touch

Found an error, or want us to add a calculator? We'd love to hear from you – use the contact form.