Simple Calculator
A free, simple calculator for everyday maths. Big buttons, a clear screen and nothing you do not need — add, subtract, multiply, divide and work out percentages in seconds. It runs in your browser, on any phone or computer, with no sign-up.
Recent calculations
How to use this simple calculator
- Type the first number using the big buttons, or your keyboard.
- Tap +, −, × or ÷, then type the second number.
- Press = to see the answer. The small line above the answer shows the full calculation, so you can check you typed it right.
- Keep going if you like — the calculator continues from your answer, so 7 + 8 = and then × 2 = gives 30.
- Made a mistake? ⌫ removes the last digit, and C clears everything.
Your last five calculations appear under the keypad, which makes it easy to double-check a shopping list or a set of homework answers. You can also use your keyboard: number keys, + − * /, Enter for =, Backspace to delete and Esc to clear.
What a simple calculator is best for
Most maths in daily life is not complicated — it is just easy to get wrong in your head. A simple calculator is the right tool for adding up a shopping bill, splitting a restaurant bill between friends, checking a discount at the till, helping a child with times-table homework, or keeping a running total of monthly expenses. The big buttons are deliberate: on a phone screen, most calculator mistakes come from tapping the wrong key, so every key here is large and clearly labelled.
It also handles the small things properly. Sums like 0.1 + 0.2 give exactly 0.3, large numbers are shown with commas (1,234,567), and if you divide by zero it simply says Error instead of a meaningless answer — press C and start again.
The percent button, explained
The % key works the way it does on a normal pocket calculator, which is exactly how discounts and tax are worked out:
Adding a percent: type 200 + 10 % and the screen shows 20 (that is 10% of 200). Press = and you get 220 — the price with 10% added.
Taking a percent off: type 200 − 10 % then = and you get 180 — the price after a 10% discount.
Finding a percent of a number: type 200 × 10 % then = and you get 20. And on its own, 50 % simply becomes 0.5.
For anything more — like “45 is what percent of 60?” — the Percentage Calculator has a tab for every kind of percent question.
Simple vs scientific calculator: which do you need?
A simple calculator does the four basic operations and percentages, working from left to right like a pocket calculator. That means 2 + 3 × 4 gives 20 here, because it works out 2 + 3 first. A scientific calculator follows the mathematical order of operations (multiply before add), so it gives 14 for the same keys.
Choose this page for everyday sums. Choose the Scientific Calculator when you need powers, roots, sin/cos/tan, logarithms or brackets — and the Graphing Calculator when you want to see an equation drawn as a graph.
Frequently asked questions
Is this simple calculator free to use?
Yes, completely free. There is no sign-up, no download and no limit on how many calculations you can do. It works on phones, tablets and computers, right in your browser.
How does the percent (%) button work?
It works like a pocket calculator. After + or −, % turns the number into that percent of the first number, so 200 + 10 % = gives 220. After ×, it gives that percent of the number, so 200 × 10 % = gives 20. On its own, 50 % becomes 0.5.
Why does 2 + 3 × 4 equal 20 here, not 14?
A simple calculator works from left to right, one step at a time, like a basic pocket calculator: 2 + 3 = 5, then 5 × 4 = 20. A scientific calculator follows the order of operations and multiplies first, giving 14. Use the Scientific Calculator on the homepage when you need brackets or the order of operations.
Can I use my keyboard with this calculator?
Yes. The number keys, + − * and / all work, Enter means =, Backspace deletes the last digit, and Esc clears everything. On a phone or tablet, just tap the big on-screen buttons.
Does the calculator save my calculations?
Your last five calculations are shown under the keypad while the page is open, so you can check them. Nothing is uploaded or stored anywhere — the calculator runs entirely in your browser, and the list disappears when you close the page.
What happens if I divide by zero?
The screen shows Error, because dividing by zero has no answer in maths. Press C (or start typing a new number) and carry on — no harm done.