Structure Calculators
Calculate concrete, reinforcement, and slope requirements for construction and installation projects. Use these tools to estimate sonotube concrete volume, rebar quantities for slabs, and ramp dimensions for code-compliant slopes. These calculators help you plan materials and layout before starting structural work.
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Sonotube Calculator
Estimate concrete volume, 60 lb and 80 lb bag counts, and cost for tube-form pier footings.
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Rebar Calculator
Calculate rebar quantity, total weight, stick count, and 2026 material cost for any slab.
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Ramp Calculator
Find required run length, slope percent, landings, handrail feet, and installed cost range.
When to use these calculators
- You're pouring concrete piers for a deck or post foundation and need bag count and cubic yards.
- You're laying a concrete slab and need to calculate rebar grid spacing, sticks, and weight.
- You're building a ramp and need the total run length for a code-compliant ADA or residential slope.
- You're planning both footings and rebar at the same time and want to size each material order.
Plan your concrete and structural work with confidence
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How to Calculate Rebar for a Slab
Learn how to calculate rebar for a concrete slab. See the grid layout formula, stock bar conversion, a worked example for a 20 by 30 foot slab, and cost tips.
2026-04-16 · 6 min read
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How Much Concrete Do You Need for Sonotubes?
See the cylinder formula, bag counts for 60 and 80 lb mix, and a worked example for common tube sizes.
2026-04-12 · 6 min read
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Rebar Spacing Guide for Concrete Slabs
Learn how rebar spacing, slab dimensions, and edge clearance determine your grid layout. See the formulas, a worked example, and tips for planning bar counts.
2026-04-14 · 7 min read
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ADA Ramp Slope Explained: The 1:12 Rule and Real Examples
How rise-to-run ratio, angle, and grade percentage work together. Includes a comparison of 1:12, 1:10, 1:8, and 1:6 slopes with real rise examples.
2026-04-21 · 7 min read
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How to Calculate Ramp Length from Rise
Step-by-step formulas for converting rise and slope ratio into run, ramp length, angle, and grade. Includes a 30-inch worked example at two ratios and the reverse calculation.
2026-04-23 · 7 min read