Free Online Calculators
Fast, free calculators for mortgages and loans, health and fitness, math, science and everyday problems. No sign-up, no fees - type your numbers and get the answer instantly, with the formula and a worked example on every page.
Scientific Calculator
A full scientific calculator, right here on the homepage - trig, logs, powers, roots and brackets, with the buttons or your keyboard. No page change needed.
More than a basic calculator. Alongside the four operations it does powers and roots, sin, cos and tan (in degrees or radians, with inverse functions on the second row), natural and base-10 logs, factorials, π and e, percentages and brackets - with the normal order of operations, so 250 + 10 × 3 is worked out correctly. Try sin(30) with Deg on: the answer is 0.5.
For anything bigger, use the specialist tools: the Percentage Calculator for percentage questions, the Mortgage Calculator for home loans, the Compound Interest Calculator for savings growth - or open the full-page Scientific Calculator and search the full list of 4,200+ calculators.
Popular Calculators
The calculators people open most - mortgages, investments, BMI, percentages and more.
Browse by Category
Every calculator belongs to one of fourteen groups, from finance and physics to food and sports. Start with a category, or use the search above.
Why use Simple Calculator?
Available in 14 languages
Use the language menu at the top to switch the whole site - navigation, categories, buttons and instructions - into Spanish, French, German, Portuguese, Italian, Turkish, Hindi, Urdu, Arabic, Russian, Chinese, Japanese or Indonesian. Urdu and Arabic also flip the layout to right-to-left, and numbers are shown in your local format.
Frequently Asked Questions
Is Simple Calculator really free?
Yes. Every calculator on the site is free to use as often as you like, with no account, no trial period and no paywall - the full result, the formula and a worked example are always shown.
Do I need to sign up or download anything?
No. Everything runs in your browser: open a calculator, type your numbers and the result appears instantly. There is nothing to install, and the numbers you enter are never sent anywhere or stored.
How accurate are the results?
Each calculator uses the standard formula for its job and shows that formula plus a worked example on the same page, so you can check the method yourself. Treat the result as a reliable estimate for the numbers you enter, and confirm big money, health or safety decisions with a qualified professional.
Which languages can I use?
The whole interface - navigation, categories, buttons and instructions - is available in 14 languages: English, Spanish, French, German, Portuguese, Italian, Turkish, Hindi, Urdu, Arabic, Russian, Chinese, Japanese and Indonesian. Use the Language menu at the top of the page to switch.