Project Inputs
m
Typical precast curbs are ~1.0 m pieces.
m
Include mortar or expansion joint allowance.
%
Segments
| Type | Length | Radius | Angle (deg) | Count | Segment length |
|---|
Results
Effective module length
— m
Stone length + joint/gap.
Total linear length
— m
Stones before wastage
—
Stones including wastage
—
Last piece length
— m
Example Data
Sample path with two straights and a quarter-circle corner.
| Type | Length | Radius | Angle | Count |
|---|---|---|---|---|
| Straight | 12 m | — | — | 1 |
| Arc | — | 3 m | 90° | 1 |
| Straight | 8 m | — | — | 1 |
Try stone length 1.0 m, joint 0.01 m, wastage 5%.
Formula Used
Module length, Lm = Ls + J
For straight: Segment length, Ls1 = L
For arc: Segment length, Ls2 = π · R · θ / 180
Total length, LT = Σ(Lseg · Count)
Raw stones, Nr = LT / Lm
With wastage, Nw = Nr · (1 + w/100)
Final stones = ceil(Nw) when rounding selected, else Nw
For straight: Segment length, Ls1 = L
For arc: Segment length, Ls2 = π · R · θ / 180
Total length, LT = Σ(Lseg · Count)
Raw stones, Nr = LT / Lm
With wastage, Nw = Nr · (1 + w/100)
Final stones = ceil(Nw) when rounding selected, else Nw
How to Use
- Choose your unit system and set stone length and joint.
- Add straight runs or arcs; enter radius and angle for arcs.
- Enter wastage for breakage, cuts, and spares; set pallet size if needed.
- Click Calculate to see counts, remainder, and pallets required.
- Export a summary as CSV or PDF for purchasing and records.
Tip: Use small joint values for tight layouts; increase for mortar joints.
FAQs
It is the leftover after dividing total length by the module length (stone length plus joint). If rounding to whole stones, this leftover indicates the final cut piece.
Yes. Add straights and arcs. Arc length is computed from radius and central angle, then included in the total length.
Typical values range 3–8% for precast curbs. Use higher allowances for complex layouts, frequent cuts, or fragile finishes.
If you provide units per pallet, the calculator divides the final required quantity by that value and rounds up to whole pallets.
Yes. Switch to the imperial unit system and enter lengths in feet. All outputs will reflect your chosen units.