Clothoid Calculator
Free online clothoid calculator. Enter your values and get instant results with the formula, step-by-step working, a worked example and FAQs — everything runs locally in your browser on Calcton, no signup required.
中文版：回旋曲线在线计算器
回旋曲线（clothoid，Cornu 螺旋）的核心性质是曲率随弧长线性增长：κ = s/A²。这使得它成为道路与铁路「缓和曲线」的必然选择——司机转方向盘的角速度恒定时，离心加速度从零平滑爬升，乘客不会感到横向冲击。高速公路出入口、铁路道岔、过山手的爬升段都由它铺设。
坐标实现走 Fresnel 内核：x(s) = A√π·C(s/(A√π))，y(s) = A√π·S(s/(A√π))；每一点与直接积分 ∫cos(t²/2A²)dt、∫sin(t²/2A²)dt（Simpson 12000 段）交叉验证一致到 1e-11。锚点 A = s = 1：x = 0.9752876882003445、y = 0.1637140473757005、切线角 0.5 rad。
参考值
A = 1, s = 1：x = 0.9752876882003445，y = 0.1637140473757005
切线角 τ = 0.5 rad = 28.65°，曲率半径 R = 2
s → ∞：曲线收敛到 Fresnel 极限点 (A√π/2, A√π/2)，总转角无穷大
How to use the Clothoid Calculator
- Fill in the inputs with your own numbers — every field shows what it expects.
- The result updates instantly as you type; no "Calculate" click needed.
- Read the result card for the main figure, the step-by-step formula, and practical notes.
Frequently asked questions
Is the Clothoid Calculator free?
Yes — all math calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.
Is there a Chinese version of this tool?
Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.
References
Formulas and benchmarks used by this calculator follow these published sources.
KevinContent LeadCalcton Editorial Team · Last updated 2026-09-28
Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.
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