Need to convert Gradians to Degrees (grad → °)? The converter above delivers instant results. Below: the exact conversion factor, a reference table, real-world examples, and the history of both units — everything you need for accurate grad to ° conversion.
The History of the Gradian
Gradians (also called gon or grade) were proposed during the French Revolution's metrication effort to decimalize angle measurement: 100 gradians = one right angle, 400 = full circle. This makes it easy to work with right angles in decimal arithmetic. Gradians are still used in French surveying, some European engineering applications, and some scientific calculators include a 'GRD' mode. The Système International (SI) did not adopt gradians as the standard angle unit — radians took that role.
The History of the Degree
The 360° circle traces to Babylon (~1500 BCE), where astronomers used a base-60 number system and divided the year into ~360 days, then divided the sky circle into 360 corresponding parts. Each degree was subdivided into 60 arcminutes and 60 arcseconds — still the basis of geographic coordinates (latitude/longitude). The 360° convention survived the metric revolution precisely because 360 has many factors (2, 3, 4, 5, 6, 8, 9, 10, 12...), making angle arithmetic unusually clean.
How to Convert Gradians to Degrees
Multiply Gradians by 0.9 to get Degrees.
° = grad × 0.9Step-by-Step Example
- Start with your value in Gradians — for example, 25 grad.
- Multiply: 25 × 0.9 = 22.5 °.
Pro Tip: For quick grad to ° conversions without arithmetic, bookmark this page. The interactive tool above updates instantly as you type.
Gradian to Degree Reference Table
| Gradian (grad) | Degree (°) |
|---|---|
| 1 | 0.9 ° |
| 2 | 1.8 ° |
| 5 | 4.5 ° |
| 10 | 9.0 ° |
| 25 | 22.5 ° |
| 50 | 45.0 ° |
| 100 | 90.0 ° |
Real-World Examples — grad to °
- 0.9 ° — the equivalent of 1 grad (the smallest reference point)
- 9.0 ° — a practical mid-range value (10 grad)
- 90.0 ° — a common large-quantity reference (100 grad)
Applications of Gradian-to-Degree Conversion
The grad to ° conversion is needed in mathematics, navigation, surveying, and astronomy. Here's where it specifically matters:
- International specifications: Products designed in one unit system must be documented for users who work in the other.
- Scientific and technical work: Research papers and engineering drawings specify angle in a particular unit — accurate conversion prevents costly errors.
- Education: Physics, chemistry, and applied math curricula require fluency in angle unit conversion.
- Everyday tasks: Cooking, construction, fitness, and travel all involve angle conversions when switching between unit systems.
Common Mistakes When Converting Gradian to Degree
- Mistake: Forgetting to switch calculator to radians mode for trigonometry
- Mistake: Confusing degrees and gradians — both use decimal notation but 90° = 100 grad
- Mistake: Using degree-based trig identities in physics formulas that expect radians
Frequently Asked Questions — Gradian to Degree
How many Degrees are in 1 Gradian?
Exactly 0.9 °. The conversion factor is 0.9 — this is derived from the precise SI definitions of both units.
What is the formula to convert Gradians to Degrees?
° = grad × 0.9. For example: 5 grad × 0.9 = 4.5 °.
How do I convert Degrees back to Gradians?
Divide by 0.9: grad = ° ÷ 0.9. Or multiply by 1.111111.
Why would I convert Gradians to Degrees?
Gradians and Degrees are both used in mathematics, navigation, surveying, and astronomy, but different countries and industries prefer different units. Converting between them is necessary when reading foreign specifications, using international recipes, or collaborating across measurement systems.
Is this Gradian-to-Degree converter accurate?
Yes — the factor 0.9 is derived from official SI definitions and international standards. All calculations use full floating-point precision.
What are some real-world examples of grad to ° conversion?
1 grad = 0.9 °; 10 grad = 9.0 °; 100 grad = 90.0 °.
Conclusion
Converting Gradians to Degrees: multiply by 0.9; 1 grad = 0.9 °. The converter above handles any value instantly. Refer to the table above for quick reference values, and bookmark this page for fast grad to ° access.