Angles are measured in degrees for everyday use, radians in mathematics, and gradians in surveying.
π radians = 180° = 200 gradians. 1° = π/180 ≈ 0.01745 radians.
Use this calculator whenever this type of everyday calculation needs to be done accurately and quickly. The tool eliminates the mental arithmetic errors that occur under time pressure or with unusual numbers.
Many errors with practical calculators arise from not reading the result in context. A number without units, without scale, or without comparison against a reference range is hard to interpret correctly.
A traveller converts currency amounts for a trip budget, checking live rates against historical averages to understand whether the current rate is favourable or whether it makes sense to exchange at a different time.
Multiply degrees by π/180. Example: 90° × π/180 = π/2 ≈ 1.5708 radians.
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