A calculator that shows its work
Most online calculators show only the number you are typing. This one shows the whole expression, and a grey preview of the answer underneath that updates as you go, so you can spot a mistake before pressing equals.
It follows the normal order of operations, so 2 + 3 × 4 gives 14, not 20. If you want the addition first, use the brackets on the scientific calculator or work it in two steps.
Everyday examples
Splitting a bill: 1,250 ÷ 4 = 312.5 each. A price rise: 80 + 15% = 92. A discount: 200 − 25% = 150. A quick tip on 60 at 20%: 60 × 20% = 12, so the total is 72.
For recurring jobs such as tips, discounts and VAT, the dedicated calculators on this site handle the extra steps and show the working in more detail.
Memory and history
Use memory to keep a running total while you work through a list: type each amount and press M+, then press MR at the end to bring the total back. The history list under the keys stores your last 30 results, and tapping one puts it back on the display.
When to use the scientific version
If you need trigonometry, logarithms, roots, powers or brackets, switch to the scientific calculator. It has the same keys and shares the same memory and history, so you can move between them without losing your work.
Questions people ask
How do I work out a percentage on this calculator?
To find a share, multiply: 80 × 15% = 12. To add or take off a percentage, type it after the plus or minus: 200 + 10% = 220, and 200 − 10% = 180. For other percentage questions, the percentage calculator explains each case.
How does the memory work?
M+ adds the number on the display to memory and M− subtracts it. MR inserts the stored number into what you are typing and MC clears it. An M appears on the display while something is stored.
Why does 0.1 + 0.2 show 0.3?
Computers store decimals in binary, which makes some tiny errors, so many calculators would show 0.30000000000000004. This one rounds away that noise to about 12 significant digits, so you see 0.3.
Can I keep calculating from the last answer?
Yes. After pressing =, type an operator such as × and the display continues from the result, shown as Ans. Typing a digit instead starts a new calculation. You can also tap an item in the history to reuse it.
Does it work with a keyboard?
Yes. Use the number keys, + − * /, Enter for equals, Backspace to delete and Escape to clear. On a phone, tap the keys. Typing x gives the multiplication sign on a keyboard.