Scientific Calculator

Formulas

• Right-angled triangle sin θ = opposite / hypotenuse, cos θ = adjacent / hypotenuse, tan θ = opposite / adjacent
• Logs log(ab) = log a + log b and log(aⁿ) = n log a
• Standard form a × 10ⁿ, with 1 ≤ a < 10

Worked example

A 5 m ladder leans against a wall at 65° to the ground. How high up the wall does it reach?

1. The height is opposite the 65° angle and the ladder is the hypotenuse, so use sin.
2. Height = 5 × sin(65°), with the calculator in degrees.
3. 5 × 0.9063 = 4.53.

Answer: About 4.53 m up the wall.

Common mistakes

• Working in radians when the angle is in degrees: sin(30) in radians is −0.988, not 0.5.
• Squaring a negative number without brackets: −3² is −9, while (−3)² is 9.
• Dividing by a product without brackets: 12 / 2 × 3 is 18. Write 12 / (2 × 3) to get 2.
• Rounding halfway through: keep the full value and round only the final answer.

About this tool

This scientific calculator covers what a school calculator does: trigonometry in degrees or radians, logarithms, powers, roots, factorials and scientific notation. Type a whole expression the way you would write it, or tap the on-screen keys. When the answer is a simple fraction, it shows that too, and your last 30 calculations stay in a history list you can click to reuse.

Tips

• You can skip the × sign: 2pi, 3(4+1) and 5sqrt(2) are all read as multiplications. A comma works as a decimal point too, so 2,5 is the same as 2.5.
• log is base 10 and ln is base e. log(1000) = 3 and ln(e) = 1. Mixing them up changes every answer in a logarithm question.
• Use brackets to make the order clear: 1/(2×3) is not the same as 1/2×3.

FAQ

What happens when I get an error?

The calculator explains the problem under the input instead of just showing Error. For example, tan 90° is undefined in degrees, and the square root of a negative number has no real answer.

Does it work on a phone?

Yes. On phones the calculator's keypad replaces the phone keyboard, so the maths keys are there from the start.

Is my history saved?

Your last 30 calculations are kept in this browser's local storage on this device. Nothing is uploaded. Clear history removes them, and so does clearing your browser data.