How does the calculator work?
- Enter your dimensions
- Length (ft)
- Width (ft)
- Depth (in)
- Choose your application
- Sidewalk (≈3,000 PSI)
- Patio (≈3,500 PSI)
- Driveway (light vehicle, 3,500 PSI; heavy vehicle, 4,000 PSI)
- Garage slab (3,500–4,000 PSI)
- Get instant results
- Total concrete volume (yd³), with waste percentage included
- Rebar required: total feet and pounds, based on spacing and bar size (#3, #4, #5)
- The PSI strength used for your selected application
Example: Driveway Calculation
Let’s say you’re pouring a 20 × 12 ft driveway at 4 in thickness. With light vehicle use (3,500 PSI):
- Concrete needed: 3.26 yd³ (with waste included)
- Rebar required: about 420 ft of #4 bar, ≈280 lb
- PSI strength: 3,500 PSI
That’s the kind of clarity that keeps projects on track and budgets under control.
Benefits of Using a Concrete Calculator
- ✅ Accurate estimates: eliminate costly guesswork
- ✅ Plan your materials: know concrete volume and steel weight before ordering
- ✅ Save time and money: avoid under-ordering or paying for extra trips
- ✅ Professional image: demonstrate technical knowledge to clients
- ✅ Educational tool: helps homeowners understand why a patio needs 3,500 PSI but a garage slab requires 4,000 PSI
Why this calculator is different
Most online concrete calculators stop at cubic yards. Ours includes:
- Rebar calculations (feet + pounds)
- PSI recommendations based on use
- Waste margin you can adjust from the admin panel
That means you not only know how much concrete to order but also how much reinforcement to prepare.
Limitations & Recommendations
A calculator gives you a strong starting point, but it doesn’t replace field conditions. Final quantities may vary due to:
- Subgrade conditions
- Base preparation and compaction
- Climate and moisture levels
- Control joints and structural details
Always confirm with a licensed contractor or engineer before placing orders.