Why is sin(180°) showing a very small number instead of 0?

Computers represent numbers in binary (floating point), so sin(180°) is computed as an extremely small number like 1.22×10⁻¹⁶ instead of exactly 0. This is normal floating-point behaviour — round to 0 for practical purposes. CalcPioneer trims this automatically.

log (log₁₀) is the base-10 logarithm: log(100) = 2 (because 10² = 100). ln is the natural logarithm (base e ≈ 2.718): ln(e) = 1. Use log for engineering/pH/decibels; use ln in calculus and natural growth models.

What is n! (factorial)?

n! = 1 × 2 × 3 × … × n. E.g. 5! = 120. Used in permutations (nPr = n!/(n−r)!) and combinations (nCr = n!/(r!(n−r)!)). Supported up to 170! (beyond that exceeds JavaScript number range).

What is the value of sin(45°)?

sin(45°) = 1/√2 ≈ 0.7071. The exact values to memorise: sin(0°)=0, sin(30°)=0.5, sin(45°)≈0.707, sin(60°)≈0.866, sin(90°)=1.

How do I calculate e to the power x?

Select the eˣ (Exponential) function and enter x as the Input Value. E.g. e² ≈ 7.389. Note: e ≈ 2.71828 is Euler's number.

Scientific Calculator

★★★★★4.8|👁10,000+ uses|📅Updated Apr 2026

✍Reviewed by Prof. Suresh Kumar, M.Sc.

Online Scientific Calculator

This online scientific calculator covers all common mathematical functions used in engineering, science, and school maths: trigonometry (sin, cos, tan and their inverses), logarithms (log base 10 and natural log), roots (square and cube), powers, factorial, exponential (eˣ), reciprocal, and absolute value.

Choose Degrees or Radians for trigonometric calculations.

Enter Details

Input Value45

Function

Angle Mode

Exponent (n — for xⁿ only)2

∑Formula

sin(θ), cos(θ), tan(θ) — trigonometric functions

log₁₀(x), ln(x) — logarithms

√x, x², xⁿ — roots and powers

n! = 1×2×3×…×n

Example Calculations

3 examples

Inputs

Input Value30

Functionsin (Sine)

Angle ModeDegrees

Exponent (n — for xⁿ only)2

Results

Result0.50

Step-by-Step

sin(30°) = 0.5. This is a fundamental trigonometry value — in a right triangle, the side opposite 30° is half the hypotenuse.

Click any example to expand and see step-by-step workings. Use "▶ Load this example" to auto-fill the calculator.

How to Use the Scientific Calculator

Enter the Input Value (the number you want to compute)
Select the Function from the dropdown (e.g. sin, log, √x)
For trig functions, choose Degrees or Radians angle mode
For the power function (xⁿ), also enter the exponent n
Click Calculate — result appears instantly

Common Scientific Calculator Functions Explained

sin/cos/tan: Trigonometric ratios for angles — used in physics, engineering, navigation
log₁₀: How many times must 10 be multiplied to get x? e.g. log(100) = 2
ln: Natural logarithm base e — used in calculus, growth models
√x: Square root — e.g. √144 = 12
n!: Factorial — used in combinations and permutations

Why Use CalcPioneer Scientific Calculator?

🆓

Free and mobile

friendly

✨

18 functions in one tool

✨

Degree and radian support for trig

✨

Handles edge cases gracefully (e.g. log

Handles edge cases gracefully (e.g. log of negative)

✨

Results displayed with 10 significant fi

Results displayed with 10 significant figures

Frequently Asked Questions

Degrees divide a circle into 360 parts; radians measure the same angle as the arc length on a unit circle. 180° = π radians ≈ 3.14159 radians. Use Degrees for most school problems; Radians in calculus and physics.

More About This Calculator

In-depth guides and tips for getting the most out of this tool.

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