Concrete Curb Calculator
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Pro tips
A standard Type B curb-and-gutter cross-section — 6-inch curb face, 14-inch gutter pan averaging 3 inches thick, and 6-inch below-grade footing extending 20 inches — totals approximately 198 square inches (1.375 sq ft). For a 100-foot run, volume = 1.375 × 100 = 137.5 cubic feet = 5.09 cubic yards. Estimating only the visible curb face underestimates total volume by 60–70%.
ACI 332 requires expansion joints every 20–30 feet; omitting them causes 80–90% of curb runs to crack within 3–5 frost seasons. Saw-cutting after the fact costs $200–$500 per 100 linear feet versus $500–$1,200 for replacement sections. A 90-degree driveway return with a 5-foot radius adds 5–8% more concrete per foot than a straight run; add 5% to any job with more than 2 radius sections.
Integral curb adds only 36 square inches (0.25 sq ft) of cross-section above the slab, so 100 feet of integral curb adds just 0.93 cubic yards to the slab pour. A separate curb-and-gutter with its own footing has a 150–200 square inch cross-section (1.0–1.4 sq ft), requiring 3.7–5.2 cubic yards for the same 100 feet. Using the integral formula for a separate pour under-orders by 75–80%, leaving 3+ cubic yards short.
Hidden costs
$0.40–$0.80 per LF for 2-inch lumber forms on straight runs, with forms reusable 3–5 times. Curved forms need flexible plastic form stakes at $0.80–$1.20 per LF and cannot be reused.
Preformed bituminous fiber expansion joint filler runs $0.15–$0.25 per LF; polyurethane joint sealant with backer rod costs $0.50–$1.00 per LF. Joints are required every 10 feet and skipping them is the primary cause of curb cracking within 3–5 frost seasons.
A curb on soft or unstable base will settle unevenly within 1–3 seasons. Compacted 3/4-inch gravel base at $1.50–$3.00 per LF for 4-inch depth under the curb footprint prevents settling and joint separation.
Rookie mistakes
Entering 200-foot curb dimensions into a slab calculator — 6 inches wide × 6 inches tall — returns 1.85 cubic yards. The actual volume including the 14-inch gutter pan and 20-inch footing is approximately 10.2 cubic yards for the same 200-foot run. That 8.35-cubic-yard shortfall is an entire truckload, stopping the pour at 36 feet and forcing a cold joint.
A 60-foot property frontage with two 15-foot driveway returns has an actual curb length of 78.8 feet — 31% longer than the property line measurement. Those missing 18.8 feet at a 1.4 sq ft cross-section represent nearly 1 cubic yard of concrete. Always walk the curb path with a measuring wheel — survey plat scaling misses 15–30% of true length on lots with even 1 driveway return.
On a 200-foot curb run with a 20-inch-wide trench, just 3 inches of average over-excavation adds 20.8 cubic feet (0.77 cubic yards) of unplanned concrete. On runs of 500+ feet this hidden volume reaches 2+ cubic yards, consuming the typical 5% waste allowance entirely. Check trench depth with a grade rod at 25-foot intervals and adjust the concrete order upward for sections deeper than spec.
Example project costs
Driveway apron, barrier curb
50 LF · 6″ W × 6″ H · 4,000 PSI, joints at 10 ft
| Concrete volume | 0.46 yd³ |
| Installed (contractor) | $1,000–$1,750 |
| Total | 0.46 yd³ · installed $1,000–$1,750 |
Parking-lot perimeter
250 LF · 9″ W × 6″ H · two 20-ft-radius corners, #3 rebar
| Concrete volume | 3.47 yd³ |
| Installed (commercial) | $5,000–$8,750 |
| Total | 3.47 yd³ · installed $5,000–$8,750 |
Garden edge curbing (DIY)
30 LF · 12″ W × 4″ H rollover · bagged mix
| Concrete volume | 0.37 yd³ |
| 80 lb bags (0.6 cu ft each) | 17 bags |
| Bag material (retail) | $95–$135 |
| Total | 0.37 yd³ · ~17 bags · $95–$135 |
What NOT to build with concrete curb calculator
Don't use concrete curb calculator for: Poured-in-place concrete curbing in a frost climate without saw-cutting expansion joints every 10 feet
Concrete expands and contracts approximately 0.0000055 inches per inch per degree F; without joints at maximum 10-foot intervals per ACI 360R-10, the curb cracks randomly under seasonal thermal forces. Saw-cutting joints costs $3–$6/linear foot; random crack repair runs $500–$1,200 per 100 linear feet replaced.
How to do it yourself
Step-by-step checklist
- Excavate the curb footprint to 3–4 inches below final grade and compact the base
- Set forms 6 inches apart (or per your curb width) and brace with stakes every 2 feet
- Install preformed expansion joint filler every 10 feet before pouring
- Consolidate the concrete in the form — rod or vibrate to eliminate voids at the corners
- Cure for a minimum of 3 days before removing forms; 7 days before any vehicle load
When to hire a professional
Concrete curb profiles and their standard dimensions
Installed cost, reinforcing, and what moves the number on a curb job
How this is calculated
Formula: yd³ = length × (width ÷ 12) × (height ÷ 12) ÷ 27; installed $20–$35/LF poured-in-place (BLS OEWS 47-2051 cement mason $24.14/hr)
| Input | Value | Unit |
|---|---|---|
| Curb length | 100 | ft |
| Curb width | 6 | in |
| Curb height | 6 | in |
Related Calculators
Concrete Cost Calculator — price ready-mix at $125–$165/yd³ or bagged mix at $6–$9/bag alongside your concrete curb project.
→ Concrete Cost CalculatorConcrete Curing Time CalculatorBefore ordering for concrete curb — check concrete curing timeline: 7 days to 70% strength at 70°F, longer in cold weather below 50°F.
→ Concrete Curing Time CalculatorConcrete Mix Design GuideConcrete curb needs a minimum 3,500 PSI mix per most DOT specs — Concrete Mix Design Guide has the reference data for water-cement ratios and admixtures.
→ Concrete Mix Design GuideFrequently Asked Questions
How much concrete do I need for 100 linear feet of curb?
For a standard 6-inch wide × 6-inch tall barrier curb: 100 LF × (6/12 ft) × (6/12 ft) / 27 = 0.93 yd³; round up to 1.0 yd³ for waste. At 80-lb bags (0.60 cu ft each): 100 LF × 0.25 cu ft/LF / 0.60 = 42 bags. Enter your specific width and height in the calculator above — a 9" × 6" profile on the same 100 LF run yields 1.39 yd³, 49% more material.
What are the standard dimensions for a residential concrete curb?
The most common residential profiles: barrier curb (6" wide × 6" tall, 108 LF/yd³), rollover/mountable curb (12" wide × 4" tall, 81 LF/yd³), and modified barrier curb (9" wide × 6" tall, 72 LF/yd³). For projects adjacent to a public street, match your local DOT standard detail — most municipal specs call for a minimum 3,500 PSI mix and vary face height by 1–3 inches between jurisdictions.
How much does concrete curb installation cost per linear foot?
Contractor-installed concrete curbing costs $20–$35/linear foot for residential and light commercial in most US markets. Straight runs on flat, accessible ground land at $20–$25/LF; curved sections, tight access, or reinforcing requirements push to $30–$35/LF. Minimum job charges of $500–$800 apply on most small projects regardless of total LF.
Can I pour concrete curbing myself?
Yes, for straight runs under 50 LF: form with 2-inch-thick lumber staked every 2 feet, pour 4,000 PSI mix, broom finish, and cure 3 days. Material cost for a 50 LF × 6" × 6" run is approximately 21 bags (80 lb) at $6.50–$9.00 each = $137–$189 in concrete, plus $25–$40 in lumber forms.
What is the difference between a barrier curb and a rollover curb?
A barrier curb has a near-vertical 6-inch face that physically stops most vehicles and will damage a tire or wheel if struck at speed. A rollover curb has a gradual 12-inch wide × 4-inch tall slope that vehicles can drive over at low speed without damage. Use barrier curb for pedestrian protection; use rollover for driveways, parking lot medians, and any location where vehicles need regular access at under 10 mph.
How long does concrete curb take to cure before driving on it?
The curb reaches approximately 70% of design strength in 7 days at 70°F per ACI 209R-92; most contractors allow 7 days before vehicle load. In cold weather below 50°F, extend cure time by 30–50%. Foot traffic is fine after 24–48 hours once the surface is hard.
Sources
- BLS OEWS 47-2051 Cement Mason Wages — verified 2026-06, updates annual