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Spiral Curve Calculator
Calculate the length and shift of a transition spiral on a road or rail.
ruler Free Online Tool
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Length
Compare Your Options And Get Clear Answers
Calculate the length and shift of a transition spiral on a road or rail.
Spiral Curve Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: L = V^3 / (R c).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Spiral Quick Guide
Typical values for reference.
| km/h | Radius m | c m/s3 | Length m |
|---|---|---|---|
| 60 | 200 | 0.6 | 38.6 m |
| 80 | 300 | 0.6 | 61.0 m |
| 100 | 500 | 0.6 | 71.4 m |
| 120 | 800 | 0.6 | 77.2 m |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Spiral Curve Calculator FAQ
Answers to common questions about this calculator.
Transition.
It gives a quick estimate of spiral curve from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.