Is my data uploaded to a server?

No. All calculations run locally in your browser using JavaScript Math functions. Nothing is sent anywhere.

What angle mode should I use for trig?

Use DEG (degrees) for everyday calculations — a right angle is 90°. Use RAD (radians) for calculus and programming — most languages use radians. Use GRAD for surveying (right angle = 100 grad).

EXP enters scientific notation — e.g. 1.5E6 = 1,500,000. Press a number then EXP then the exponent. This is useful for very large or very small numbers.

Can I use the keyboard?

Yes. Number keys, operators (+, -, *, /), Enter (=), Backspace and Escape (clear) all work from the keyboard.

What is the difference between log and ln?

log(x) is base-10 logarithm — log(100) = 2 because 10² = 100. ln(x) is the natural logarithm (base e) — ln(e) = 1. Scientists use ln for growth/decay formulae; engineers use log for decibels and signal strength.

Why does sin(90) give a slightly off result in RAD mode?

In RAD mode, sin(90) computes sin(90 radians), not sin(90°). 90 radians is about 14.3 full circles — the result is sin of an angle near 90rad ≈ 0.894. To get sin(90°) in RAD mode, enter sin(π/2) instead.

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Scientific Calculator

Full-featured scientific calculator with trigonometry, logarithms, powers, roots, factorial and memory functions. Free, browser-based, no signup.

🧮 Math & Finance Tools Free Browser-based

Tool

Scientific Calculator Functions

This calculator supports all standard scientific operations — arithmetic, trigonometry, logarithms, exponents, roots and factorials. Results are displayed with full precision and expression history is kept for reference.

Trigonometric Functions

Function	Description	Inverse
sin(x)	Sine of angle x	sin⁻¹ (arcsin)
cos(x)	Cosine of angle x	cos⁻¹ (arccos)
tan(x)	Tangent of angle x	tan⁻¹ (arctan)

Logarithm & Exponential

Function	Description
log(x)	Base-10 logarithm
ln(x)	Natural logarithm (base e)
log₂(x)	Base-2 logarithm
xʸ	x raised to the power y
e	Euler's number ≈ 2.71828
π	Pi ≈ 3.14159

Degrees vs Radians — When to Use Each

The angle mode you choose fundamentally changes the output of every trigonometric function. Use DEG (degrees) for everyday geometry, engineering, and navigation — a full circle is 360°, a right angle is 90°. Use RAD (radians) when working with calculus, physics formulae, or any programming language (Python, JavaScript, C++) where Math.sin() and similar functions expect radians by default — a full circle is 2π ≈ 6.283. Use GRAD (gradians) for surveying and some European engineering disciplines — a right angle is 100 grad. Forgetting to match the mode to your problem is one of the most common sources of wrong answers on scientific calculators.

Order of Operations

This calculator follows standard mathematical order of operations (PEMDAS/BODMAS): Parentheses first, then Exponents, then Multiplication and Division left to right, then Addition and Subtraction left to right. Use parentheses liberally to group sub-expressions and ensure the calculation runs in the order you intend. The expression history lets you review the full expression that produced each result.