Degree of Curve ↔ Radius Converter
Arc-definition degree of curve to radius, both unit systems.
Indian Railways speaks 'degree' (a 2° curve = 859 m radius); highways speak radius. Sharper than 10° is tramway territory.
Formula
Degree of Curve ↔ Radius Converter is a free degree of curve for surveyors, civil engineers and property buyers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Degree of Curve ↔ Radius Converter
Arc-definition degree of curve to radius, both unit systems. The calculation implements R(m) = 1718.9/D (30 m arc); R(ft) = 5729.6/D (100 ft arc) (Railway/highway curve practice). Indian Railways speaks 'degree' (a 2° curve = 859 m radius); highways speak radius. Sharper than 10° is tramway territory.
How to use Degree of Curve ↔ Radius Converter
- 1Enter Degree of curve (30 m arc) in °.
- 2Read Radius, US definition (100 ft arc) instantly — no submit button needed.
- 3Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Degree of Curve ↔ Radius Converter?
- ✓Implements the standard formula — R(m) = 1718.9/D (30 m arc); R(ft) = 5729.6/D (100 ft arc)
- ✓Reference cited on-page: Railway/highway curve practice
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Degree of Curve ↔ Radius Converter use?+
It computes R(m) = 1718.9/D (30 m arc); R(ft) = 5729.6/D (100 ft arc), per Railway/highway curve practice. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
Indian Railways speaks 'degree' (a 2° curve = 859 m radius); highways speak radius. Sharper than 10° is tramway territory.
Are regional land units exact?+
Conversion factors follow state revenue-department values noted on the tool. Units like bigha and katha vary by region, so always confirm the local factor named in your land records.
Is the Degree of Curve ↔ Radius Converter free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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