Tool · runs in your browser

Degrees to radians

Trigonometry in calculus is written in radians: d/dx sin x = cos x is only true that way. This converts a degree measure and shows the exact multiple of π when the angle is a clean one.

• 30
• 45
• 60
• 210

How the result is checked

After converting, the tool evaluates the original and the converted expression at 12 random angles. It only prints a conversion that agrees at every one of them — a transformation that fails that check is dropped rather than shown.

• Multiply by π/180. 210° = 210π/180 = 7π/6.
• A clean fraction of π exists when the degree measure divides evenly — 7° does not.

Other directions

• Product to sum calculator
• Sum to product calculator
• Power reducing calculator (sin², cos², sin³, cos³)
• Radians to degrees

Want the rule identified for you instead of picking a direction?Which identity should I use?