Scientific calculator with trig, log and power functions
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify · Updated July 2026
Scientific Calculator handles advanced maths in your browser — trigonometry (sin, cos, tan and inverses), logarithms, exponents and powers, roots, factorials, constants like π and e, and standard arithmetic with correct order of operations. It's built for students, engineers, and anyone who needs more than a basic calculator, with a clear layout that works on phone and desktop. Calculations run locally and instantly, with no app to install and nothing stored.
Expressions are parsed and evaluated following standard mathematical order of operations (parentheses, exponents, multiplication/division, addition/subtraction). Trigonometric functions respect the selected degree or radian mode, logarithms support base-10 and natural log, and the calculator uses IEEE 754 double-precision arithmetic (about 15 significant digits) — matching the precision of standard scientific calculators. All evaluation happens locally in your browser.
| Function | What it does | Example |
|---|---|---|
| sin · cos · tan | Trigonometry | sin(30°) = 0.5 |
| asin · acos · atan | Inverse trig | asin(0.5) = 30° |
| log | Base-10 logarithm | log(1000) = 3 |
| ln | Natural log (base e) | ln(e) = 1 |
| xʸ | Power / exponent | 2^10 = 1024 |
| √ | Square root | √144 = 12 |
| n! | Factorial | 5! = 120 |
| π · e | Constants | π = 3.14159…, e = 2.71828… |
Results use double-precision (about 15 significant digits), the same as a standard hardware scientific calculator.
The most common wrong answer on any scientific calculator comes from the angle mode. sin(30) is 0.5 only if the calculator is in degrees; in radians, sin(30) ≈ −0.988. Trigonometry homework is almost always in degrees, but many programming and physics contexts use radians. Before trusting a trig result, check which mode you're in — it silently changes every answer.
The calculator follows standard BODMAS/PEMDAS precedence: brackets first, then exponents, then multiplication and division, then addition and subtraction. So 2 + 3 × 4 evaluates to 14, not 20. When in doubt, add brackets — they make your intent explicit and guarantee the grouping you meant, especially in longer expressions mixing powers and fractions.
"log" on this calculator means the base-10 logarithm (log₁₀), so log(1000) = 3 because 10³ = 1000. "ln" is the natural logarithm, base e ≈ 2.718, used throughout calculus, growth models and compound interest. Mixing them up is a frequent slip — if a formula says "log" in a maths or engineering context it usually means base 10, while science and finance formulas often mean ln.
Open Clacify's Scientific Calculator, ensure you're in Degree mode (for angles in °) or Radian mode, enter your angle, and press SIN, COS, or TAN. For example: sin(30°) = 0.5, cos(60°) = 0.5, tan(45°) = 1.
Use the LOG button for base-10 logarithm (common log) or LN for the natural logarithm (base e). For example: log(100) = 2, log(1000) = 3, ln(e) = 1, ln(10) = 2.3026.