What this tool does: It sizes the hump profile, estimates paving volume, paint coverage, mass, and cost, then charts the vertical section for fast review.
Planning note: Always verify local road authority, campus, and site-access requirements before construction. This tool supports conceptual sizing and quantity checks.
Calculator Inputs
Example Data Table
| Scenario | Road Width (m) | Height (mm) | Ramp Up (m) | Flat Top (m) | Ramp Down (m) | Approx. Volume per Hump (m³) |
|---|---|---|---|---|---|---|
| School entry road | 7.0 | 75 | 1.00 | 3.70 | 1.00 | 2.47 |
| Private site access | 6.0 | 65 | 0.90 | 3.00 | 0.90 | 1.52 |
| Campus collector lane | 8.0 | 80 | 1.20 | 4.00 | 1.20 | 3.33 |
Formula Used
The calculator models the hump as a trapezoidal vertical profile extruded across the road width. It then applies waste, paint coverage, density, and unit cost.
The comfort index and severity score are planning indicators for comparing profile smoothness. They are not a substitute for jurisdictional design standards.
How to Use This Calculator
- Select metric or imperial units.
- Choose whether ramp lengths come from 1:n ratios or direct inputs.
- Enter road width, lane count, hump count, and hump height.
- Add the flat top length and either slope ratios or custom ramps.
- Fill in spacing, paint coverage, coats, density, unit cost, and waste.
- Press Calculate Dimensions to show results above the form.
- Review the graph, quantities, and severity indicators.
- Download a CSV or PDF summary for estimating files.
FAQs
1. What does this calculator estimate?
It estimates hump length, ramp grades, paving volume, paint area, mass, spacing rate, and a simple profile severity indicator for planning work.
2. Does it follow every local standard automatically?
No. Road authorities, schools, private estates, and campuses can all use different limits. Always confirm local dimensions, signage, drainage, and marking rules.
3. When should I use slope ratio mode?
Use ratio mode when you know the desired 1:n ramp geometry. It quickly converts height into ramp lengths for a more controlled profile layout.
4. When is manual ramp mode better?
Manual mode is better when a drawing, site standard, or existing hump already defines ramp lengths and you only want quantity and slope outputs.
5. Why include waste factor?
Waste factor helps cover overrun, trimming, surface variation, and minor site losses. It is useful when preparing orders and preliminary cost allowances.
6. What does marking coverage mean?
Marking coverage is the painted share of the hump plan area. Increase it for broader chevrons, bars, or warning patterns across the hump surface.
7. Can I use this for speed tables?
Yes, conceptually. Enter a longer flat top and suitable ramps. Still verify whether your local authority classifies the device as a hump or table.
8. Why is the profile graph useful?
The graph helps you check shape balance instantly. Steeper ramps and shorter totals appear sharper, making early design review much faster.