Angle calculator
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- 180° = π radians = 200 gradians = 0.5 turn.
- Degrees = 90.
| Inputs | Answer |
|---|---|
| Angle: 90; Unit: Degrees | 90 deg = 90 degrees = 1.570796 radians. |
| Angle: 3.14159; Unit: Radians | 3.14159 rad = 179.999848 degrees = 3.14159 radians. |
| Angle: 100; Unit: Gradians | 100 grad = 90 degrees = 1.570796 radians. |
| Angle: 0.25; Unit: Turns | 0.25 turn = 90 degrees = 1.570796 radians. |
How to use it
A full turn is 360 degrees = 2π radians = 400 gradians = 1 turn. So 180° = π radians, 90° = π/2 and 1 radian ≈ 57.2958°. The complement of an angle is 90° minus it and the supplement is 180° minus it.
The radians are also shown as a multiple of π, which is the form used in trigonometry.
Frequently asked questions
How do I convert degrees to radians?
Multiply by π ÷ 180.
How many degrees is 1 radian?
About 57.2958°.
What is the supplement of 60°?
120°.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
Written by Calculators Free Editorial Team · Data checked 2026-11-12
About · How we verify this · Editorial policy · Corrections
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.