Rebar & Mesh Grid Calculator
Calculate rebar grid total linear feet, 20-foot stick counts, lap splices, and support chairs for concrete slabs and footings.
Enter Your Dimensions
US • ftHow We Calculated This
• Tie bar intersections with 16-gauge annealed steel tie wire.
• Use plastic rebar chairs spaced 2 to 3 feet in each direction.
Formula & Volumetric Method
Rebar grid calculates crosswise and lengthwise bars based on spacing (typically 12", 18", or 24") with 3" edge clearance.
Calculations are performed strictly using standard civil engineering constants. Volumetric outputs are normalized to true compaction rates, ensuring purchased quantities match jobsite yields.
Jobsite Engineering Guidelines
- Support rebar on plastic or concrete chairs so it sits in the middle-to-upper third of the slab depth.
- Lap splices should overlap by at least 30 bar diameters (typically 15-18 inches for #4 bar).
Frequently Asked Questions
How accurate is the Rebar & Mesh Grid Calculator for ordering materials?
Our calculations match standard store packaging sizes in the US, Canada, UK, and Australia. We include a safety waste buffer (default 8% to 12%) so you do not run short due to uneven ground or spillage.
Why should I add extra for waste when ordering?
Uneven ground, cutting scrap, and leftover mix in the wheelbarrow or mixer drum consume an extra 5% to 15% of material. Ordering only the exact measurement usually leaves you short, which can lead to expensive extra delivery fees.
Does this calculator support both Imperial and Metric units?
Yes. You can switch between US Customary (feet, inches, cubic yards, pounds), Canadian units, UK metric, and Australian standards using the region selector in the header or the unit dropdown on each input.