Gradians to Radians Converter
Convert gradians to radians for mathematical and scientific use.
Result
1 grad = 0.015708 rad
Results are provided for general informational purposes only. Always verify important calculations independently. Learn more
About These Units
GRAD
A gradian is 1/400th of a full circle, used in some surveying.
Common Uses: European surveying, construction, civil engineering
RAD
A radian is the angle where the arc length equals the radius.
Common Uses: Mathematics, physics, trigonometry, calculus, engineering
Conversion Formula
radians = degrees × π/180
Worked Example:
To convert GRAD to RAD:
180° × π/180 = π radians
Common GRAD to RAD Conversions
| GRAD | RAD | GRAD | RAD |
|---|---|---|---|
| 1 grad | 0.0157 rad | 50 grad | 0.7854 rad |
| 2 grad | 0.0314 rad | 75 grad | 1.1781 rad |
| 5 grad | 0.0785 rad | 100 grad | 1.5708 rad |
| 10 grad | 0.1571 rad | 250 grad | 3.927 rad |
| 25 grad | 0.3927 rad | 500 grad | 7.854 rad |
Frequently Asked Questions
When should I use radians vs degrees?
Degrees are intuitive for everyday use, navigation, and engineering drawings (90° = right angle, 180° = straight line). Radians are essential for calculus, physics, and programming because they make trigonometric derivatives and integrals simpler. Scientific calculators and programming languages typically default to radians for trigonometric functions.
Why are there 360 degrees in a circle?
The 360-degree system originated with ancient Babylonian mathematics and astronomy. The number 360 has many divisors (24 factors), making it convenient for dividing circles into halves, thirds, quarters, fifths, sixths, eighths, and more. This divisibility made angle calculations easier before modern calculators, and the system persists today for its intuitive nature and widespread familiarity.
What exactly is a radian?
A radian is the angle subtended at the center of a circle by an arc equal in length to the radius. Since a circle's circumference is 2πr, a full circle contains 2π radians. This makes π radians equal to 180 degrees. Radians are "natural" units because they eliminate conversion constants in mathematical formulas, particularly in calculus and physics equations.
How do I convert degrees to radians mentally?
Remember that 180° = π radians, so divide degrees by 180 and multiply by π. For common angles: 90° = π/2, 60° = π/3, 45° = π/4, 30° = π/6. For practical calculations, multiply degrees by 0.01745 to get radians (since π/180 ≈ 0.01745). For example, 45° × 0.01745 ≈ 0.785 radians.
What are gradians and when are they used?
Gradians (also called gon or grades) divide a circle into 400 equal parts, with 100 gradians in a right angle. This makes calculations in surveying slightly easier because right angles become whole numbers (100 grad). Gradians are used in some European surveying applications, but degrees and radians dominate most fields. 360° = 400 gradians = 2π radians.