How Much Concrete for a 5x20 Sidewalk?
How much concrete for a 5x20 sidewalk: about 1.23 cubic yards at the standard 4-inch thickness. The walk covers 100 square feet, so each extra inch of depth adds about 0.31 yards.
Concrete calculator →Step-by-step
- Area: 5 × 20 = 100 sq ft.
- Volume: 100 × (4 ÷ 12) = 33.3 cu ft.
- Yards: ÷ 27 = 1.23 yd³.
- Bags instead: 56 bags of 80 lb mix (75 of 60 lb).
Related: How Much Gravel for a 5x20 Walkway?
Concrete by thickness
| Thickness | Cubic feet | Cubic yards | Yards +10% | 80 lb bags | 60 lb bags |
|---|---|---|---|---|---|
| 4 in | 33.3 | 1.23 | 1.36 | 56 | 75 |
| 5 in | 41.7 | 1.54 | 1.70 | 70 | 93 |
| 6 in | 50.0 | 1.85 | 2.04 | 84 | 112 |
Thickness for walks
Most residential sidewalks are 4 inches thick on a compacted gravel base. Thicken any section that a car, mower or delivery cart will roll over, especially where the walk meets the drive.
Related: How Much Pea Gravel for a 5x20 Walkway?
Joints along the walk
Tool a control joint about every 5 feet, matching the width, which gives roughly 3 joints along this walk. Add an isolation joint where the walk meets the house, steps or a driveway so the slabs can move independently.
How to buy it
This is past the point where bags are practical; call a ready-mix plant. If the truck cannot reach the far end of the walk, plan for wheelbarrows or a chute extension; see how far a concrete chute reaches.
Slope and finish
Give the walk a slight cross slope, around 1/4 inch per foot, so water sheds to one side. A light broom finish across the walk gives grip when it is wet.
Questions people ask
How many yards of concrete for a 5x20 sidewalk?
About 1.23 cubic yards at 4 inches thick.
How many bags for a 5x20 sidewalk?
About 56 bags of 80 lb concrete at 4 inches.
How thick should a sidewalk be?
Four inches for foot traffic, 6 inches where vehicles cross.
How far apart should sidewalk joints be?
About every 5 feet for a 5-foot-wide walk, keeping panels close to square.
How much does a cubic yard of concrete weigh?
Roughly 4,000 pounds, or about 2 tons, for normal-weight concrete.
Related guides
- Concrete Sidewalk Thickness for Walks and Crossings
- How Much Concrete for a Sidewalk? Yards per Foot
- How Much Area Does a Yard of Concrete Cover?
- How Many Bags of Concrete in a Yard? 40, 60, 80 lb
- Gravel Base Under a Concrete Slab: Depth and Tons
- How Many Yards in a Concrete Truck? Mixer Sizes
- Concrete Short Load Fee: What It Is and How to Cut It
- 60 lb vs 80 lb Concrete Bags: Yield, Count, and Cost
- Rebar vs Wire Mesh in a Slab: Which One to Use
- How Much Concrete for a 5x10 Sidewalk?
- How Much Concrete for a 5x15 Sidewalk?
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