DIY

Concrete Slab Calculator

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate concrete for a slab by dimensions. Cubic yards, bags, and rebar spacing. Free calculator.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

How to Use This Calculator
Tips for Best Results

Berechnung

m³ = L × B × Dicke. 6×3×0,10 = 1,8 m³ + 10% = 2 m³. Gehweg: 8-10 cm. Garage: 12-15 cm. Immer auf verdichtetem Schotter.

Aushärtung

Begehbar: 24-48h. 70% Festigkeit: 7 Tage. Voll: 28 Tage.

⚡ CalcWolf Insight

Concrete reaches 70% of its strength in 7 days but needs 28 days to fully cure. Do not drive on a new driveway for at least 7 days. Walking is fine after 24-48 hours.

Frequently asked questions

Wie dick?▾

Gehweg: 8-10 cm. Garage: 12-15 cm. Lager: 15-20 cm.

Aushärtungszeit?▾

Begehbar 24-48h. Befahrbar 7 Tage. Voll 28 Tage.

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →