Kerb Stone Quantity Calculator

Work out kerb stone quantity instantly with clear inputs, formula shown and shareable results.

About Kerb Stone Quantity Calculator

Kerb quantity is the total run divided by the unit length, doubled where both sides of the carriageway are kerbed, plus a small breakage allowance. Bedding and haunching concrete is roughly 0.045 cubic metres per metre of kerb for a standard 150 mm bed with a rear haunch.

Formulas

Kerb units

Units = road length x sides / unit length x (1 + breakage)

Bedding concrete

m³ = total run x 0.045

Worked example

With the default values below, Kerb Stone Quantity Calculator returns Kerb units required of 687. Change any input above and every figure here is recalculated in your browser.

Inputs used

Road lengthminimum 0.1 m: 200 m
Kerb unit lengthminimum 0.1 m: 0.6 m
Sides to kerbone of One side, Both sides: Both sides
Breakage allowanceaccepts 0–20 %: 3 %

Results

Kerb units required: 687
Total kerb run: 400.0 m
Units per side: 334
Concrete bedding and haunch: 18.00 m³

Step by step

1Values used
2Kerb units
3Bedding concrete
4Kerb units required= 687
5Total kerb run= 400.0 m
6Units per side= 334
7Concrete bedding and haunch= 18.00 m³

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Kerb Stone Quantity figure worked out?

Units = road length x sides / unit length x (1 + breakage). Kerb quantity is the total run divided by the unit length, doubled where both sides of the carriageway are kerbed, plus a small breakage allowance.

Do radius kerbs change the count?

Yes. Curves need shorter radius units and more of them per metre of arc, and transitions and drop kerbs at crossings are counted separately.

What values do I need to enter?

This calculator takes 4 inputs: Road length, Kerb unit length, Sides to kerb, Breakage allowance. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.