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Concrete Curb Calculator

Estimate cubic yards, total weight, and 40/60/80-lb bag counts for curb-and-gutter runs with linear-foot and cross-section math in one place.

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Used to calculate volume & materials.
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Waste Control
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L: 5 ftFlag: 10 inGutter W: 20 inCurb H: 20 inCurb D: 10 in1 ft
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Calculation Details

Why this curb calculator is more useful than a raw linear-foot shortcut

Search demand around this topic clusters around curb-and-gutter volume, linear-foot conversions, bag counts for short repairs, and formula questions. This page keeps those checks next to the live calculator instead of sending you to three different tools.

Keep the cross-section formula visible

Curb work is not just length times thickness. The page shows the actual curb-and-gutter formula so the estimate is easier to sanity-check.

Use planning sections before you order

Reference rows for common starting profiles make it easier to compare residential-style runs, heavier street sections, and wider gutter pans.

Compare bag counts and yardage together

Short curb repairs can still be bag projects, while longer runs quickly become yardage-and-delivery conversations.

Keep quantity separate from cost and local detail

This page helps you size the concrete. Pricing, traffic control, reinforcement, and municipal profile approval still belong to the project scope.

Reference Tables

Section Profiles, Bag Yield, and Query-Pattern Checks

Use these tables as planning references for common curb-and-gutter sections, short-run bag counts, and the search patterns people usually mean when they land on this page. Final dimensions still belong to the actual project detail.

Common curb-and-gutter starting sections

These are planning sections built from the same formula used by the live calculator. They are not municipal standards and should be checked against the actual local profile.

Profile

Repair edge

Section dimensions
6 in D × 6 in H × 12 in G × 4 in flag
Yards / 10 LF
0.278 yd³
Yards / 100 LF
2.78 yd³

Profile

Residential curb + gutter

Section dimensions
6 in D × 6 in H × 18 in G × 4 in flag
Yards / 10 LF
0.340 yd³
Yards / 100 LF
3.40 yd³

Profile

Street curb + gutter

Section dimensions
6 in D × 6 in H × 18 in G × 6 in flag
Yards / 10 LF
0.463 yd³
Yards / 100 LF
4.63 yd³

Profile

Wider gutter run

Section dimensions
6 in D × 6 in H × 24 in G × 6 in flag
Yards / 10 LF
0.556 yd³
Yards / 100 LF
5.56 yd³

These rows use the calculator formula directly and assume no extra waste. Once your local detail, drive crossings, or tie-ins differ, use the live inputs instead of the planning row.

Approximate bag counts for a 10-foot curb run

These counts follow the same live assumptions used across the site: 40-lb = 0.30 ft³, 60-lb = 0.45 ft³, and 80-lb = 0.60 ft³ per bag.

Profile

Repair edge

Base volume
7.50 ft³
40-lb bags
Approx. 25 bags
60-lb bags
Approx. 17 bags
80-lb bags
Approx. 13 bags

Profile

Residential curb + gutter

Base volume
9.17 ft³
40-lb bags
Approx. 31 bags
60-lb bags
Approx. 21 bags
80-lb bags
Approx. 16 bags

Profile

Street curb + gutter

Base volume
12.50 ft³
40-lb bags
Approx. 42 bags
60-lb bags
Approx. 28 bags
80-lb bags
Approx. 21 bags

Profile

Wider gutter run

Base volume
15.00 ft³
40-lb bags
Approx. 50 bags
60-lb bags
Approx. 34 bags
80-lb bags
Approx. 25 bags

Rounded to whole bags before extra waste. Add waste only after the base section and actual run length are confirmed.

What the main curb query variants usually mean

These phrases often overlap in intent, but the planning risk changes depending on whether the searcher is thinking about quantity, formula, or pricing.

Query pattern

Concrete curb calculator

What people are sizing
Straight curb footage or a short repair section that still needs real section math.
What to verify
Lock the curb profile before you convert linear footage into yards or bags.

Query pattern

Curb and gutter calculator

What people are sizing
A raised curb plus the flat gutter or flag poured as one section.
What to verify
Confirm curb depth, curb height, gutter width, and flag thickness together.

Query pattern

Concrete curb calculator formula

What people are sizing
The searcher wants the cross-section math behind the total, not just an output box.
What to verify
Use the formula row and keep slab-style shortcuts out of the workflow.

Query pattern

Curb calculator cost

What people are sizing
Adjacent pricing intent layered on top of the same quantity question.
What to verify
Use this page for quantity first, then price forms, labor, traffic control, and cleanup separately.

Search demand around curb is low-difficulty but intent-fragmented. The safest page strategy is quantity-first guidance with explicit scope boundaries.

Need a flat pour instead? Switch to the slab calculator. For round piers and sonotubes, use the column calculator.

Worked Examples

Linear-foot curb examples that answer the real ordering question

These examples use the same curb formula as the live calculator and apply a 10% waste allowance so the order-ready total is visible, not hidden.

Example 1

10 LF short repair section

This is the bag-first scenario behind many curb calculator searches: a short edge repair where the crew still wants an honest section check before buying material.

Base volume
0.278 yd³
With 10% waste
0.306 yd³
80-lb bags
Approx. 14 bags
Query match
curb calculator bags
  1. 1Use a 6 in curb depth, 6 in curb height, 12 in gutter width, and 4 in flag thickness.
  2. 2Cross-section = 6 × (6 + 4) + 12 × 4 = 108 in².
  3. 3At 10 LF, base volume = 7.50 ft³ = 0.278 yd³, and 10% waste brings it to 8.25 ft³ = 0.306 yd³.
  4. 4At 0.60 ft³ per 80-lb bag, the order-ready total rounds to about 14 bags.
Takeaway: Short curb repairs can still make sense with bags, but only after the actual section is locked instead of guessed from linear feet alone.
Example 2

50 LF residential curb + gutter

This mid-size example lines up with the mainstream curb-and-gutter intent cluster and shows how quickly linear footage turns into real yardage.

Base volume
1.70 yd³
With 10% waste
1.87 yd³
80-lb bags
Approx. 85 bags
Query match
curb and gutter calculator
  1. 1Use a 6 in curb depth, 6 in curb height, 18 in gutter width, and 4 in flag thickness.
  2. 2Cross-section = 6 × (6 + 4) + 18 × 4 = 132 in².
  3. 3At 50 LF, base volume = 45.83 ft³ = 1.70 yd³, and 10% waste brings it to 50.42 ft³ = 1.87 yd³.
  4. 4At 0.60 ft³ per 80-lb bag, the order-ready total is about 85 bags.
Takeaway: Even a moderate residential run leaves bag territory quickly once the real curb-and-gutter profile is applied.
Example 3

100 LF street curb + gutter

This longer run matches the linear-foot planning intent behind curb-and-gutter takeoffs and makes the ready-mix conversation obvious.

Base volume
4.63 yd³
With 10% waste
5.09 yd³
80-lb bags
Approx. 230 bags
Query match
linear foot curb calculator
  1. 1Use a 6 in curb depth, 6 in curb height, 18 in gutter width, and 6 in flag thickness.
  2. 2Cross-section = 6 × (6 + 6) + 18 × 6 = 180 in².
  3. 3At 100 LF, base volume = 125.00 ft³ = 4.63 yd³, and 10% waste brings it to 137.50 ft³ = 5.09 yd³.
  4. 4At 0.60 ft³ per 80-lb bag, the same run would require about 230 bags.
Takeaway: This is where a curb estimator stops being a bag worksheet and becomes a clear ready-mix ordering problem.

Common Mistakes

Where curb-and-gutter estimates usually go wrong

The math is not hard. The wrong orders usually come from section confusion, unit shortcuts, or asking the quantity page to answer a pricing or code question.

Mistake 1

Using linear feet without locking the curb section first

Linear footage matters only after the curb-and-gutter cross-section is known. Otherwise one run can look much smaller or larger than it really is.

  • Confirm the raised curb and the flat gutter together.
  • Treat per-foot rules of thumb as checks, not as the first calculation.

Most curb estimate errors start with a section assumption, not a length mistake.

Mistake 2

Confusing curb height, total depth, and reveal

Crews often mix the visible curb face with the full section they are actually pouring, which quietly changes the total concrete volume.

  • Use the actual curb height and the actual flag thickness shown in the section.
  • Check whether the project detail is using reveal language, total height, or another profile label.

A profile detail from the jurisdiction or plans should always win over a generic assumption.

Mistake 3

Using square-foot shortcuts like the job were a slab

Curb work is driven by cross-section area multiplied by linear run, not by a flat slab footprint alone.

  • Use square-foot shortcuts only after the curb section has already been translated into a real cross-section.
  • Keep slab math on the slab page and curb math on the curb page.

This is why the page keeps the formula, tables, and examples next to the calculator.

Mistake 4

Treating a quantity page like a pricing sheet or local standard detail

The concrete amount is only one part of the curb scope. Traffic control, saw cutting, tie-ins, drainage, jointing, and local profile rules can change the real job quickly.

  • Use this page to estimate quantity first.
  • Price labor, forms, access, and local detail requirements after the concrete volume is known.

Keeping scope boundaries explicit makes the page more trustworthy and more useful.