About the Scientific Calculator
A full scientific calculator with sin, cos, tan (degree and radian modes), natural and base-10 logs, powers, roots, π, and e. Built with a safe math parser that runs entirely on your device.
Every function runs locally in your browser. No expression you evaluate is transmitted or logged, which matters more than people expect when the numbers are from work or coursework.
How to use it
- Enter your expression using the keypad or your keyboard.
- Switch between degrees and radians before using any trigonometric function.
- Press = to evaluate, and use parentheses freely to force the order you want.
Degrees versus radians — check this first
This is the source of most 'the calculator is wrong' complaints. sin(30) is 0.5 in degrees but −0.988 in radians. Neither is a bug; they are different units.
School trigonometry and surveying generally use degrees. Calculus, physics and anything involving π use radians. Set the mode before you start, not after.
A worked example
Evaluating (3.2 × 10⁴) ÷ (8 × 10²):
Enter it as 3.2e4 ÷ 8e2. The result is 40.
And a compound-growth check: 1.06 raised to the power 4 gives 1.2625, which says money at 6% compounded annually grows about 26.25% over four years.
Common mistakes
- Leaving the mode in radians and then computing angles in degrees.
- Writing log when you meant ln. On most calculators log is base 10 and ln is base e.
- Omitting parentheses around a whole numerator. −b/2a is not the same as −b/(2a).
Questions people ask
What is the difference between log and ln?
log is the logarithm base 10; ln is the natural logarithm, base e (about 2.718). Chemistry and engineering lean on log; calculus and growth models lean on ln.
How do I enter a very large or very small number?
Use scientific notation with e — 6.02e23 for Avogadro's number, 1.6e-19 for the elementary charge.
Does it respect order of operations?
Yes, standard precedence with full parenthesis support. When in doubt, add brackets — they cost nothing.