How it works
A simple everyday calculator that works like the one on your phone. The answer is previewed as you type, and pressing = moves it to the display so you can keep calculating. Multiplication and division are done before addition and subtraction, and every result is saved in the history below so you can reuse it with one tap.
2 + 3 × 4 = 14 · 200 + 10% = 220 · 50 × 10% = 5
Keys and shortcuts
- %: after + or −, adds or subtracts that percent of the number before it (200 + 10% = 220); otherwise divides by 100.
- ±: changes the sign of the whole expression.
- Keyboard: type numbers and + − * /, press Enter for =, Backspace to delete and Esc to clear.
Tips
- Need sin, cos, log or powers? Use the scientific calculator.
- Results are shown with up to 12 significant digits.
- History stays only while this page is open and is never sent anywhere.
Standards and sources
- Order of operations follows standard arithmetic precedence (× ÷ before + −)
- Numbers use IEEE 754 double-precision arithmetic, as in all web browsers
Last reviewed October 7, 2026
Frequently asked questions
How does the percent key work?
After + or −, it adds or subtracts that percent of the number before it, so 200 + 10% = 220. In other places it divides by 100, so 50 × 10% = 5.
Does it follow the order of operations?
Yes. Multiplication and division are calculated before addition and subtraction, so 2 + 3 × 4 = 14.
Can I use my keyboard?
Yes. Type numbers and + − * /, press Enter for the result, Backspace to delete and Esc to clear.
Where is my calculation history?
Below the calculator. Tap any line to put that result back in the display. It is kept only while the page is open.
Why is 0.1 + 0.2 shown as 0.3?
Results are rounded to 12 significant digits, which hides the tiny binary rounding errors that computers make.