Scientific Calculator
A free online scientific calculator with trigonometry, logarithms, powers, roots, factorials and brackets, accurate to 15 digits.
About the Scientific Calculator
Use sin, cos and tan in degrees or radians (switch with DEG/RAD), inverse trig, natural and common logs, powers, square and cube roots, factorials, π and e. Results are computed with 40-digit decimal arithmetic and shown to 15 significant digits.
Implicit multiplication works the way you write it on paper: 2π or 3(4 + 1).
The formula
Supports + − × ÷, xʸ, √, ∛, n!, sin, cos, tan, sin⁻¹, cos⁻¹, tan⁻¹, ln, log, π, e
How to read your result
- Check DEG or RAD before using trig functions.
- History keeps your last 30 results on this device.
Worked example
The height of a 10 m ladder leaning at 60° to the ground
- Height = 10 × sin 60° (DEG mode)
- sin 60° = 0.8660254
- 10 × 0.8660254 = 8.660254 m
Questions people ask
Why is tan 90° an error?
tan 90° is undefined because cos 90° = 0, and the calculator says so rather than showing a huge wrong number.
How accurate is it?
Calculations use 40 significant digits internally and display 15, more than a typical handheld scientific calculator.