Scientific Calculator – Free Online with Sin, Cos, Tan, Log and More
This free online scientific calculator supports all advanced mathematical functions — trigonometry (sin, cos, tan and inverses), logarithms (log base-10 and ln), square and cube roots, powers, factorial, absolute value and the mathematical constants π and e. Full keyboard support, instant results, works in any browser on mobile or desktop. No signup required.
How to Use This Scientific Calculator
- Click function buttons (sin, cos, log etc.) or type directly using your keyboard
- Use DEG mode for degrees (everyday use) or RAD for radians (engineering/calculus)
- Use parentheses to group expressions — e.g. sin(45) * cos(45)
- Press = or Enter to evaluate. Press C or Escape to clear
- Press Backspace (⌫) to delete the last character
- Click the result box to copy the answer to clipboard
Functions Supported
| Function | Button | Example (DEG) | Result |
|---|
| Sine | sin | sin(30) | 0.5 |
| Cosine | cos | cos(60) | 0.5 |
| Tangent | tan | tan(45) | 1 |
| Inverse Sine | sin⁻¹ | sin⁻¹(0.5) → 30° | 30 |
| Inverse Cosine | cos⁻¹ | cos⁻¹(0.5) → 60° | 60 |
| Log base-10 | log | log(1000) | 3 |
| Natural Log | ln | ln(e) | 1 |
| Square Root | √x | √(144) | 12 |
| Cube Root | ∛x | ∛(27) | 3 |
| Power | xʸ | 2 ** 10 | 1024 |
| Square | x² | 9 **2 | 81 |
| Factorial | n! | 5! | 120 |
| Absolute Value | |x| | |x|(-7) | 7 |
| Pi | π | π * 2 | 6.2832 |
| Euler's number | e | e ** 2 | 7.389 |
DEG vs RAD — Which Mode Should I Use?
DEG (Degrees) is used for everyday calculations, school maths, navigation and most practical applications. A full circle = 360°.
RAD (Radians) is used in higher mathematics, calculus, physics and engineering. A full circle = 2π radians. Most scientific and graphing calculators default to radians.
Degrees → Radians: multiply by π/180 | Example: 90° × π/180 = 1.5708 rad
Radians → Degrees: multiply by 180/π | Example: π/2 × 180/π = 90°
Common Scientific Calculations
Pythagorean theorem: √(3² + 4²) = √(9+16) = √25 = 5
Circle area: π × r² | Example: π × 7² = 153.94 cm²
Compound interest: 10000 × (1 + 0.08)^10 = ₹21,589
Decibels: 10 × log(P₂/P₁) | log(1000) × 10 = 30 dB
💡 Keyboard shortcuts: Type numbers and operators directly. Press Enter to calculate, Escape to clear, Backspace to delete. All standard math operators work: + − * / ** % ( )
Scientific Calculator Uses
- Students (Class 10–12) — trigonometry, logarithms, coordinate geometry
- Engineering & Science — physics, chemistry, electrical calculations
- Finance — compound interest, NPV, IRR, exponential growth
- Programming — binary/hex calculations, bitwise operations, modulo
- Statistics — standard deviation, probability, combinations
- Architecture & Civil — angles, areas, volumes, unit conversions
Frequently Asked Questions
How do I calculate sin(30) on this calculator?Make sure you are in DEG mode. Click sin, type 30, then press ) and hit =. Result: 0.5. In DEG mode sin(90) = 1, sin(180) = 0, which matches everyday angle understanding.
What is the difference between log and ln?log is base-10 logarithm — log(10) = 1, log(100) = 2, log(1000) = 3. ln is natural logarithm (base e ≈ 2.71828) — ln(e) = 1, ln(1) = 0. ln appears in calculus, continuous compound interest and exponential growth formulas.
How do I calculate x to the power of y?Type the base number, click xʸ (or type **), then type the exponent. For example: 2 ** 10 = 1024. You can also type expressions directly: 3**4 = 81.
How does factorial work?Click the number first, then press n!. Example: type 5 then press n! to get 120 (5! = 5×4×3×2×1 = 120). Factorials are used in combinations, permutations and probability.
Does this calculator support keyboard input?Yes. Type numbers and operators (+ − * / ** % . ( )) directly using your keyboard. Press Enter to calculate, Escape to clear all, and Backspace to delete the last character.