Concrete Sidewalk and Walkway Calculator
About Concrete Sidewalk and Walkway Calculator
Concrete Sidewalk Calculator handles long, narrow pours such as sidewalks, garden paths and walkways, where the run length is much greater than the width. A 10 m path at 1 m wide and 100 mm thick holds 1 m3, or 1.1 m3 with a 10 percent waste allowance, which is about 92 bags of 25 kg mix. A 30 ft sidewalk at 3 ft wide and 4 inches thick comes to roughly 1.22 cubic yards with waste, or about 55 bags of 80 lb mix. Standard residential sidewalk thickness is 100 mm (4 inches), rising to 150 mm (6 inches) at any point a vehicle crosses, such as a driveway apron. Long narrow slabs are the most crack prone shape in residential concrete, so they are normally divided into bays roughly as long as they are wide, with control joints between them. Those joints do not change the total volume, but they do change how you pour it, and calculating the whole run in one go still gives you the right delivery or bag count.
How to use Concrete Sidewalk and Walkway Calculator
- Choose metric or imperial input
- Enter length, width, and depth of your slab
- See volume and bag count in both metric and imperial instantly
Frequently Asked Questions
- How much concrete do I need for a sidewalk?
- Multiply run length by path width by thickness. A 30 ft sidewalk at 3 ft wide and 4 inches thick needs about 1.11 cubic yards, or 1.22 cubic yards with a 10 percent waste allowance. A 10 m path at 1 m wide and 100 mm thick needs 1.1 m3 with waste.
- How thick should a sidewalk or path be?
- One hundred millimetres, or 4 inches, is standard for pedestrian use over a compacted sub base. Increase to 150 mm (6 inches) at driveway crossings or anywhere a vehicle will drive over the path.
- How far apart should control joints be on a path?
- A common rule is to space joints at roughly 24 to 30 times the slab thickness, and to keep bays close to square. For a 100 mm path that means joints every 2.4 to 3 m. Joints control where the slab cracks but do not change the concrete volume.
- How wide should a garden path be?
- Around 900 mm to 1 m suits one person comfortably, and 1.2 m allows two people to walk side by side or a wheelbarrow to pass easily. Width has a direct linear effect on volume, so widening a 10 m path from 1 m to 1.2 m adds 0.2 m3 at 100 mm thick.
- Can I pour a long path in stages?
- Yes. Pour bay by bay against formwork so each section is finished properly while the concrete is workable. Calculate the full run for ordering purposes, then split the mix across bays as you go.
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