How to use the online calculator
- 1Tap the keys or type on your keyboard — the answer appears as you type.
- 2Switch to Scientific for powers, roots, sin, cos, tan, logs, factorials, π and memory.
- 3Press = (or Enter) to keep the answer; it goes into your history and ANS.
- 4Tap an answer in the history to use it again, or copy it.
Order of operations and percent rules
- 01Order of operations: brackets, then powers (^), then × and ÷, then + and −
- 02Powers work right to left: 2^3^2 = 2^9 = 512, and −2^2 = −4
- 03Percent like a pocket calculator: 50 + 10% = 55, 200 × 10% = 20
- 042π and 3(4 + 5) multiply automatically
The calculator follows the standard order of operations taught in school (often remembered as BODMAS or PEMDAS): anything in brackets first, then powers and roots, then multiplication and division from left to right, and finally addition and subtraction. So 2 + 3 × 4 is 14, not 20.
Percent works the way people expect from a pocket calculator. Adding or subtracting a percentage uses a share of the number before it — 50 + 10% is 55, and a price of 80 minus 25% is 60 — while multiplying by a percentage simply uses it as a fraction: 200 × 10% is 20.
In scientific mode, the trigonometry keys use degrees or radians (switch with DEG/RAD). Answers are rounded to 12 significant digits, which hides the tiny binary rounding errors computers make, so 0.1 + 0.2 shows 0.3.
Good to know
- Use brackets when in doubt: (2 + 3) × 4 is 20, while 2 + 3 × 4 is 14.
- To add 18% tax to a price, type the price + 18%.
- Check DEG or RAD before using sin, cos or tan — most school maths uses degrees.
- Press ANS to reuse your last answer in the next sum.
Online calculator — common questions
How does the calculator handle percentages?
Like a pocket calculator: 50 + 10% gives 55 and 80 − 25% gives 60, because the percentage is taken of the number before it. 200 × 10% gives 20.
Why does 2 + 3 × 4 give 14?
Multiplication comes before addition in the standard order of operations, so 3 × 4 is worked out first. Use brackets — (2 + 3) × 4 — to add first.
How do I use degrees or radians?
Open Scientific mode and tap DEG/RAD to switch. sin, cos and tan (and their inverses) then use that unit.
Does it work without the internet?
Once the page has loaded, every calculation happens in your browser, so it keeps working even if your connection drops.
Is my history saved?
Your last 20 answers are kept only in your own browser, so they're there next time on this device. Clear them any time with Clear history.
Sources
- Order of operations — standard mathematical convention (BODMAS / PEMDAS)
Formulas last reviewed: September 30, 2026 ·How we check our formulas