Cold Patch Calculator
Calculate how many 50-lb bags of cold-patch asphalt you need to repair a pothole or small area, plus total material cost.
How this calculator works
Cold patch is sold in 50-lb bags for pothole and small-area repairs, so this calculator converts your framed repair area and depth into cubic feet, then divides by the 0.45 cubic feet each bag yields.
Formula: Cubic feet = Length ft × Width ft × Depth ft. Bags = Cubic feet ÷ 0.45.
Worked example
A 4 ft × 3 ft repair area framed around a pothole, at a 2-inch depth:
- Depth in feet: 2 ÷ 12 = 0.1667 ft
- Cubic feet: 4 × 3 × 0.1667 ≈ 2.00 ft³
- Bags: 2.00 ÷ 0.45 ≈ 4.44 bags
- At $20/bag, that’s $88.89.
Coverage reference
| Repair area | Depth | Bags needed (50-lb) |
|---|---|---|
| 2 ft × 1.5 ft | 2 in | 1.11 bags |
| 4 ft × 3 ft | 2 in | 4.44 bags |
| 8 ft × 6 ft | 2 in | 17.78 bags |
How to measure your repair area
Frame a clean rectangle around the pothole or damaged patch, extending a few inches beyond the visibly broken edge so the repair sits on stable surrounding asphalt rather than crumbling right at its border. Use the full depth of the damage, from the surface down to sound base material, not just the depth of the visible hole.
Frequently asked questions
How much does a bag of cold patch cover?
A standard 50-lb bag of cold-mix asphalt yields about 0.45 cubic feet, similar to a 60-lb bag of concrete mix. This calculator converts your patch area and depth into cubic feet, then divides by 0.45 to get the bag count.
How do I frame the repair area for a pothole?
Measure a rectangle around the pothole's outer edge rather than just the hole itself — a 4 ft × 3 ft framing area is typical for a single pothole plus its surrounding cracked or crumbling edge that also needs to come out. Squaring off the repair boundary also gives you cleaner, more stable patch edges than following the pothole's irregular shape.
Why isn't waste factored into cold patch calculations?
Cold patch is applied and compacted in place with hand tools, without the cutting or sheet-good waste you'd get from materials like shingles or pavers. Any leftover unopened material from a bag just goes back in its container for the next repair, so this calculator doesn't add a waste percentage.
Do I need to compact cold patch in layers?
Yes, for any patch deeper than about 2 inches — tamp the material down in lifts of roughly 2 inches each rather than filling the full depth and compacting once. Compacting in lifts gets more even density throughout the patch and reduces the chance it settles or potholes again within a season.
How is cold patch different from hot-mix asphalt for repairs?
Cold patch is pre-mixed with a liquid asphalt emulsion that stays workable at ambient temperature, so it can be applied without heating equipment — ideal for small repairs and cold-weather patching. Hot-mix asphalt bonds and compacts better long-term but must be placed while hot, which usually isn't practical for a single pothole.
Does cold patch cure the same way as hot-mix asphalt?
No — cold patch firms up gradually as its solvents evaporate and traffic compacts it further, rather than curing through cooling like hot mix. It's considered a durable repair for smaller jobs, but larger or heavily trafficked areas are better served by hot-mix asphalt once weather allows.
Estimates only. Verify quantities with your supplier before purchasing.