Civil Engineering

🏗️ Concrete & Rebar Estimator

Calculate the volume of concrete and total weight of reinforcement steel (rebar) needed for a slab foundation or driveway. Essential for accurate materials procurement.

Slab Specifications

Length (ft)

Width (ft)

Thickness (in)

Rebar Spacing (in)

How the Calculations Work

Step-by-step breakdown of the underlying equations.

Volume (Cubic Feet)

V_{\text{ft}^3} = L \times W \times \left(\frac{T}{12}\right) = 10 \times 10 \times \left(\frac{4}{12}\right) = 33.33\text{ ft}^3

Volume (Cubic Yards)

V_{\text{yd}^3} = \frac{V_{\text{ft}^3}}{27} = \frac{33.33}{27} = 1.23\text{ yd}^3

Total Rebar Length

L_{\text{rebar}} = \left(\frac{L \times 12}{S}\right) \times W + \left(\frac{W \times 12}{S}\right) \times L = 10.0 \times 10 + 10.0 \times 10 = 200.0\text{ ft}

Rebar Weight

W_{\text{rebar}} = L_{\text{rebar}} \times 0.668 = 200.0 \times 0.668 = 133.6\text{ lbs}

Variables:

L / W: Length / Width of slab (ft)
T: Slab thickness (inches)
S: Rebar grid spacing (inches)

Concrete Volume Required

1.23 Yards

Approx. 1 mixer truck(s) needed.

Steel Reinforcement

Estimated rebar required: 200 linear feet. Total weight: 134 lbs (based on #4 rebar).

✓Confidence Score: 100% (Geometric Calculation)

ℹSource:ACI 318 Concrete Design Standards

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🏗️ Concrete & Rebar Estimator

Slab Specifications

How the Calculations Work

Volume (Cubic Feet)

Volume (Cubic Yards)

Total Rebar Length

Rebar Weight

Steel Reinforcement

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🏗️ Concrete & Rebar Estimator

Slab Specifications

How the Calculations Work

Volume (Cubic Feet)

Volume (Cubic Yards)

Total Rebar Length

Rebar Weight

Steel Reinforcement

Related Calculators

Vampire Draw Calculator

Paint & Coverage Estimator

Siding Estimator

Drywall Calculator

Carbon Footprint Calculator

1031 Exchange Tax Deferral