Functions you get
Basic operations
- + − × ÷ with proper operator precedence
- Parentheses for grouping
- Decimal point and sign change (±)
- Percentage (%)
Trigonometry
- sin, cos, tan
- Inverse: sin⁻¹, cos⁻¹, tan⁻¹
- DEG / RAD switch
Powers & roots
- x², x³, xʸ
- Square root (√), cube root
- Factorial (n!)
Logarithms & constants
- log₁₀ (common logarithm)
- ln (natural logarithm)
- π (pi) and e (Euler's number)
- Memory: M+, M−, MR, MC
Worked examples
Compound interest. 1000 × (1 + 0.05)^10 = €1,628.89 — a €1,000 deposit at 5% annual interest after 10 years.
Pythagorean theorem. √(3² + 4²) = √25 = 5. The hypotenuse of a 3-4 triangle.
Trigonometric height. A 50 m building seen at 35° elevation from 71.4 m away: tan(35°) × 71.4 = 50 m.
Logarithm. log₁₀(1000) = 3. ln(e²) = 2.
VAT calculation. €120 net × 1.21 = €145.20 gross. To extract VAT: 145.20 ÷ 1.21 = 120.
Keyboard shortcuts
| Key | Action |
|---|---|
0–9 | Number entry |
+ − * / | Arithmetic |
Enter / = | Calculate |
. | Decimal point |
Backspace | Delete last digit |
Esc | Clear all |
DEG vs RAD — choose carefully
The most common scientific-calculator mistake is leaving the calculator in RAD mode while you type angles in degrees. sin(30°) in DEG mode = 0.5; the same input in RAD mode treats 30 as radians and returns −0.988. Look at the indicator at the top of the calculator before you start a trigonometry calculation.
Frequently asked questions
Is the calculator free and ad-free?
Yes. The calculator panel itself contains no ads. The page may show contextual ads above and below the tool to fund the site.
Does it work offline?
Once the page is loaded, the calculator runs entirely in your browser — no server round-trips, no data sent anywhere.
How do I calculate a percentage?
For 18% of 250: type 250 × 0.18 = 45. To find what percent A is of B: A ÷ B × 100.
What is the difference between log and ln?
log is base 10 (log₁₀1000 = 3). ln is base e (≈2.71828) — the natural logarithm used in calculus and physics.
Need unit conversions instead?
For unit conversions head to the main converter page — meters, kilograms, temperature, currency-style ratios and 12 more categories.