Concrete Curb & Gutter Calculator — m, m³
How to use this calculator
Choose a curb profile type — barrier (vertical face), mountable/rollover (sloped), or straight curb with gutter pan. Enter total run length, curb and gutter dimensions using the unit dropdown (m, cm, mm). Select your currency below.
Cost — ready-mix per m³, 50 kg bags, or 25 kg bags.
Reinforcement — continuous longitudinal bars (Ø10 or Ø12) running the full curb length per EC2 §9.5.
Labor — rate per linear meter, per m³, or flat price.
Saved Calculations
| Time | Profile | Length | Vol m³ | Cost | Rebar | Labor | Total |
|---|
How to Calculate Concrete for Curb and Gutter (Metric)
Combined kerb-and-channel is cast monolithically as a constant cross-section extruded along the run. Choose the profile, enter the run length and the four section dimensions in m, cm or mm, then add 5–10% waste for subgrade tolerance, form spillage and the over-pour at the channel lip. "Volume (net)" is the neat-line quantity for take-off; order against "Volume (+waste)". Slip-form (extruded) kerb wastes less (≈5%); hand-formed work over rough subgrade 10–15%.
How to use it
Select barrier (150–200 mm vertical face), mountable/rollover (sloped face for vehicle crossings) or straight (full-depth kerb monolithic with the channel). Typical standard details use a 150 mm kerb height and width with a 300–600 mm channel at 100–150 mm thickness — confirm against the local highway authority detail. Tap any dimension label on the section to focus that input. Plan ready-mix delivery with the concrete volume calculator; cost short repairs as bagged concrete.
Formulas
Barrier: A = (Kerb H × Kerb W) + (Channel W × Channel T).
Mountable: A ≈ (½ × Kerb H × Kerb W) + (Channel W × Channel T) — the sloped face is treated as a triangular kerb section above the channel.
Straight: A = (Kerb H + Channel T) × Kerb W + (Channel W × Channel T).
Volume = A × Length × (1 + Waste%). Concrete density 2 400 kg/m³.
Reinforcement per EC2
Continuous longitudinal bars (Ø10 ≈ 0.617 kg/m, Ø12 ≈ 0.888 kg/m) for shrinkage and crack control per EN 1992-1-1 §9.5; lap splices at 40·db (§8.7). Standard stock length 6 m (12 m available). Movement joints every 6–10 m. The same bar data feeds the concrete beam and column calculators where the kerb ties into a ground beam.
On the jobsite
Installed kerb & channel in 2025 EU runs roughly €70–140/m hand-formed and €40–90/m slip-form (extruded), with ready-mix C25/30 at ≈ €120–150/m³ and a +€5–15/m³ premium for an XF2 freeze-thaw spec. The biggest take-off mistake is ordering the net volume: a 25 m residential kerb is only ~0.5 m³, well below the 3–4 m³ part-load minimum (+€80–150 surcharge), so plan to combine pours or price short repairs as bagged concrete. Equally common: skipping movement joints every 3–4 m (EN 1992-1-1 §9.5) — sawcut within 4–12 hours of finishing or the kerb cracks at random. Save runs to History and export with the diagram as text, CSV, JPG or PDF.
FAQ
Net or +waste for ordering? Order the +waste figure; a part-load surcharge costs more than the overage. Is the channel included? Yes — Channel Width × Thickness is added to every profile. Radii and ramps? Estimate curved returns and crossings separately; this tool covers straight runs. For an adjoining wall or formed steps, use the dedicated calculators.
