Driveway · updated 2026
Asphalt Cold Patch Calculator
A pothole patch is the rare asphalt job where bags beat the truck — but underestimating by two bags means a second store trip with the hole half-filled. This cold patch asphalt calculator converts your pothole's dimensions into exact 50-lb bag counts using compacted asphalt density (145 lbs per cubic foot), with 2026 material costs. One 50-lb bag covers about 2 square feet at 2 inches deep — the math below scales that to any hole.
Fill deeper than 2 in with multiple lifts, compacting each
Show the math
Volume per patch = 3 × 3 × (2 ÷ 12) = 1.50 ft³
Weight = 1.50 × 145 lbs/ft³ (compacted asphalt) = 217.5 lbs
Bags = 217.5 × 1 ÷ 50 lbs/bag = 5 (rounded up)
What the numbers mean
Volume is the footprint multiplied by the material depth. Cubic yards help compare supplier quotes; tons are the purchase unit for asphalt and gravel.
The asphalt calculator applies 145 lb per cubic foot. The gravel calculator applies 110 lb per cubic foot. Asphalt also adds the waste factor you select.
The material cost is a national planning range before delivery, labor, excavation, base preparation, tax, or other project-specific charges.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| Cold patch asphalt, 50-lb bag | $20.00 – $28.00 / 50-lb bag | Retail |
| Hand tamper or plate compactor rental | $30.00 – $50.00 / day | Per day; worth it for large patches |
Material prices: Wave 1 Batch 1 2026 national-average guide, Sep 2026. Local prices vary. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Clean the hole first — loose debris and water are why patches pop out by spring.
- Fill in 2-in lifts, compacting each; one deep dump never compacts at the bottom.
- Crown the patch slightly above the surrounding asphalt; traffic compacts it flush.
- Square the hole edges with a saw or pick — feathered thin edges crumble within months.
- Cold patch is a 1–3 year repair, not a permanent fix; plan a proper infrared or saw-cut repair for chronic spots.
- A 3×3 ft pothole at 2 in deep needs 5 bags — buy 6, because opened bags do not store well.
Common questions
Frequently asked questions
How many bags of cold patch for a 3×3 ft pothole 2 inches deep?
3 × 3 × (2/12) = 1.5 cu ft × 145 lbs = 218 lbs ÷ 50 = 4.4 → 5 bags.
How much area does a 50-lb bag of cold patch cover?
About 2 sq ft at 2 in deep (50 lbs ÷ 145 lbs/cu ft = 0.34 cu ft).
How deep can I patch in one lift?
2 inches — deeper holes need multiple lifts, each compacted before the next.
Cold patch vs hot mix?
Cold patch for small repairs you do yourself; hot mix (from a plant) for large areas, applied by a crew.
How long does a cold patch repair last?
Typically 1–3 years depending on traffic, drainage, and how well it was compacted.
Should I tamp it or drive over it?
Both — tamp each lift during install, then let traffic finish the compaction over the following days.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.