Scientific Calculator — Free Online with sin, cos, log

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A proper scientific calculator in your browser — trigonometry, logarithms, powers and pi, all computed locally.

Expression

Functions in radians: sin(1.5708) ≈ 1. Use deg conversions like sin(30×3.14159÷180) for degrees, or type sin(0.5236) for sin(30°).

How to use this tool

1. Type an expression or use the function buttons to insert sin, cos, log and friends.
2. Press = (or Enter). Angles are in radians.
3. Press a function button while your cursor is placed to insert exactly there.

Example

sqrt(2) + ln(2.718281828) → 1.4142 + 1 ≈ 2.4142. For degrees: sin(30°) = sin(0.5236 rad) ≈ 0.5.

The formula

expression evaluated with whitelisted Math functions; radians assumed (multiply degrees by π/180)

What the result means

This is real floating-point math with standard library functions — the same results a handheld calculator gives, including the radian convention for trigonometry. Angles in mathematics and physics default to radians; degrees are a convenience of daily life.

Frequently asked questions

Why radians and not degrees?

Radians are the natural unit of mathematics — derivatives and series only work cleanly in radians. Multiply your degrees by π/180 (or 0.01745) before feeding trig functions.

What is the difference between log and ln?

log is base-10 (log(100) = 2), ln is natural base-e (ln(e) = 1). Chemistry uses both; spreadsheets call them LOG10 and LN.

Can I use it for exams?

Use it to check your work — most exams want the method shown, and this tool deliberately shows you only the answer. Learning happens in the steps.

Is my input recorded?

No — evaluation happens locally in your browser.

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Privacy & data: this tool runs entirely in your browser — nothing you type is uploaded, saved or sent anywhere. · Disclaimer: calculations use standard scientific formulas — for lab, safety or field decisions, always double-check with official protocols. · Privacy Policy · Disclaimer