How do I switch between degrees and radians?

Click the DEG/RAD button at the top of the calculator to toggle between degree and radian mode. The current mode is always shown on the button.

How do I use memory functions?

MC clears memory, MR recalls the stored value, M+ adds the current value to memory, M- subtracts from memory.

🧮 Scientific Calculator – Free Online

Free online scientific calculator with trigonometric functions (sin, cos, tan), logarithms, powers, roots, factorials, constants and memory functions. Ideal for students, engineers and scientists worldwide. Works on any device.

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How to Use This Free Scientific Calculator

The CalculatorAha scientific calculator works just like a physical scientific calculator. Enter numbers using the keypad, use operators for basic arithmetic, and tap the function buttons for advanced operations like trigonometry, logarithms and powers.

The calculator supports two modes toggled with the DEG/RAD button — degree mode for everyday angles (0°–360°) and radian mode for mathematical and scientific work. The current mode is always displayed in the top-left of the screen.

Press INV to activate inverse functions — sin becomes arcsin (sin⁻¹), cos becomes arccos, tan becomes arctan, log becomes 10^x, and ln becomes e^x.

Function Reference

Button	Function	Example
`sin`	Sine of angle	sin(30°) = 0.5
`cos`	Cosine of angle	cos(60°) = 0.5
`tan`	Tangent of angle	tan(45°) = 1
`asin`	Inverse sine (INV + sin)	asin(0.5) = 30°
`√x`	Square root	√(16) = 4
`x²`	Square (INV + √x)	5² = 25
`∛x`	Cube root	∛(27) = 3
`x³`	Cube (INV + ∛x)	3³ = 27
`log`	Base-10 logarithm	log(100) = 2
`ln`	Natural logarithm	ln(e) = 1
`n!`	Factorial	5! = 120
`xʸ`	Power (x to the y)	2^10 = 1024
`1/x`	Reciprocal	1/4 = 0.25
`π`	Pi constant	3.14159265...
`e`	Euler's number	2.71828182...

Memory Functions

The memory buttons let you store and recall values during complex calculations:

MC (Memory Clear) — Erases whatever is stored in memory
MR (Memory Recall) — Pastes the stored memory value into the display
M+ (Memory Add) — Adds the current display value to memory
M− (Memory Subtract) — Subtracts the current display value from memory

When a value is stored in memory, the green M badge appears on the display as a reminder.

Scientific Calculator – For Students and Professionals Worldwide

Our free online scientific calculator is used by secondary school and university students, engineers, scientists and researchers across the world. It covers all the functions found on standard scientific calculators like the Casio fx-series and Texas Instruments TI models — without needing a physical device.

Trigonometry – sin, cos, tan and Inverse Functions

Calculate sine, cosine and tangent in both degrees and radians. Switch between DEG and RAD mode depending on your problem. Inverse functions (arcsin, arccos, arctan) are also included. These are essential for A-Level maths, GCSE, SAT, ACT, engineering degrees and physics problems worldwide.

Logarithms and Exponentials

Calculate log base 10 (common logarithm) and natural logarithm (ln, base e). Also supports powers (x², xⁿ), square root (√), cube root and the mathematical constant e (Euler's number ≈ 2.71828) and π (pi ≈ 3.14159).

Frequently Asked Questions

How do I calculate sin, cos or tan? +

Enter the angle value first, then press the sin, cos or tan button. Make sure you are in the correct mode — DEG for degrees (e.g. sin(30) = 0.5) or RAD for radians. Toggle the mode with the DEG/RAD button.

How do I calculate arcsin, arccos or arctan? +

Press the INV button first to activate inverse mode, then press sin, cos or tan. The button labels update to show asin, acos, atan as a reminder. For example: INV → sin → 0.5 gives 30° in degree mode.

How do I raise a number to a power? +

Enter the base number, press xʸ, then enter the exponent and press =. For example: 2 → xʸ → 10 → = gives 1024.

What is the difference between log and ln? +

log is the base-10 logarithm (log₁₀). ln is the natural logarithm (base e ≈ 2.71828). log(100) = 2 because 10² = 100. ln(e) = 1 because e¹ = e.

How do I calculate factorial? +

Enter the number then press n!. For example: 5 → n! = 120, because 5! = 5 × 4 × 3 × 2 × 1 = 120. Factorial only works for non-negative integers up to about 170.