Expression calculator: order of operations
Evaluate expressions with parentheses, powers, ×÷ and +- respecting PEMDAS. Solve inner then outer parentheses, avoid left→right error. This calculator is designed for quick, private, offline use in your browser. All formulas run locally and are verified against official sources. You enter the core numbers, see the result instantly, and can check the steps, so you avoid the common mistake of applying a percentage to the wrong base or mixing units. Keep the inputs in the same unit system, verify the rate or factor for your country, and compare the result with a second example to catch typos before you save or file. Enter any expression using + - * / : ^ ** sqrt() and brackets () [] {}. Fractions like 2/3 stay exact and are auto-simplified via GCD. Repeating decimals like 0.(3) or 2.0(6) become generating fractio
TL;DR
- Parentheses → exponents → multiplication/division → addition/subtraction.
- Formulas: Parentheses → Exponents → ×÷ → +-
- 2+3×4 — 3×4=12
How it works
Parentheses → exponents → multiplication/division → addition/subtraction. Functions sin, log with correct priority. Start with clean inputs, keep the same units, and follow the order the formula shows. The tool does the arithmetic, but you decide the rate, period, or factor. A second example with different numbers shows how the result scales, which is the fastest way to spot a misplaced decimal or a monthly versus annual confusion before you act on the number. Enter any expression using + - * / : ^ ** sqrt() and brackets () [] {}. Fractions like 2/3 stay exact and are auto-simplified via GCD. Repeating decim
The math
2+3×4=14 not 20. sin30+log10 100=0.5+2=2.5.
PEMDAS guarantees 2+3×4=14.
Examples
2+3×4
- 3×4=12
- 2+12=14
sin30+log10 100
- 0.5
- 2
- 2.5
When to use it
✦ Homework
Check expressions.
✦ Quick
Mixed calculation.
⚠ Common mistakes
- Missing parentheses
- Degrees vs radians
FAQ (6)
PEMDAS?
Parentheses, exponents, ×÷, +-.
Degrees radians?
360°=2π rad.
Is my data kept private when I use these everyday tools?
Yes. Whether it's a word count or a time-between-dates check, nothing is sent to a server. The page does the counting locally — you can paste a draft, get 1,242 words and 6 min reading time, and close it without a trace.
Do I need internet after the first load?
Not really. Once cached, word-counter, hours, fuel-cost and the rest work offline. Handy if you're drafting on a train or counting hours on site without signal — load once, use anywhere.
How reliable are the results for work?
They follow documented rules — reading time at 200-250 wpm, hours as decimal, etc. — and are tested automatically. For casual use they're spot-on; for payroll with overtime rules or legal word-count filings, do a final check against your HR or editorial guide.
What's the fastest way to share a result?
'Share Link' does it. It encodes your inputs in the address bar, so the other person sees the exact same hours (e.g. 09:15 to 17:45 = 8h 30m) without you retyping.
Sources & References
How this calculator is maintained
This calculator is written and maintained by Davide Coronese, independent developer and founder of CalcTracker.
Methodology: every formula is checked against official publications and validated by an automated test suite before release. Health, tax and finance pages cite the exact sources they rely on.
Found an error? Contact us — verified corrections ship within 24 hours.