Concrete for a 15-Foot Sidewalk, 3 Feet Wide
Measuring a 15 ft long, 3 ft wide sidewalk, 4 in thick? The quantity works out to about 0.61 yd³ (cubic yards to order (+10% waste)). Also: cubic yards (exact): 0.56 yd³; cubic feet: 15.0 ft³; 80-lb bags of concrete mix: 28 bags.
Concrete Sidewalk Calculator
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| Cubic yards (exact) | 0.56 yd³ |
|---|---|
| Cubic feet | 15.0 ft³ |
| 80-lb bags of concrete mix | 28 bags |
| 60-lb bags of concrete mix | 37 bags |
How this number is calculated
15 ft × 3 ft × 4 in ÷ 12 = 15.0 cubic feet. Divide by 27 to get 0.56 cubic yards, then add 10% for spillage and uneven ground: 0.61 cubic yards.
Nearby sizes
| Size | Cubic yards to order (+10% waste) |
|---|---|
| a 10 ft long, 4 ft wide sidewalk, 4 in thick | 0.54 yd³ |
| a 10 ft long, 5 ft wide sidewalk, 4 in thick | 0.68 yd³ |
| a 10 ft long, 3 ft wide sidewalk, 4 in thick | 0.41 yd³ |
| a 15 ft long, 4 ft wide sidewalk, 4 in thick | 0.81 yd³ |
Tips
- Residential sidewalks are typically 3–4 feet wide and 4 inches thick.
- Long, narrow pours use less concrete than people expect: width and thickness matter as much as length.
- Bagged mix is practical for short walks; for 60+ feet, compare the price of a ready-mix delivery.
Frequently asked questions
How much concrete do I need for a 15 ft long, 3 ft wide sidewalk, 4 in thick?
Measuring a 15 ft long, 3 ft wide sidewalk, 4 in thick? The quantity works out to about 0.61 yd³ (cubic yards to order (+10% waste)). Also: cubic yards (exact): 0.56 yd³; cubic feet: 15.0 ft³; 80-lb bags of concrete mix: 28 bags.
How is the quantity for a 15 ft long, 3 ft wide sidewalk, 4 in thick calculated?
15 ft × 3 ft × 4 in ÷ 12 = 15.0 cubic feet. Divide by 27 to get 0.56 cubic yards, then add 10% for spillage and uneven ground: 0.61 cubic yards.
How much does concrete for a 15 ft long, 3 ft wide sidewalk, 4 in thick cost?
Using rough planning prices (per cubic yard, ready-mix delivered (small loads can add a short-load fee)), the material for a 15 ft long, 3 ft wide sidewalk, 4 in thick comes to about $85.56 to $122. Prices vary by region and supplier, so get a local quote.