Concrete Calculator

Estimate concrete volume, premix bags, and mix-your-own quantities and costs.

Length

Width

Thickness

Height

Diameter

Number of Steps

Rise

Run

Wastage (%)Extra concrete added to allow for spills, uneven surfaces, measurement differences, and jobsite waste.i

Bag SizeThe size of the ready-mix concrete bag you plan to purchase. Available sizes are 40, 60, and 80 lb.i

Density (lb/ft³)The typical weight of normal-weight concrete per cubic foot. Actual density can vary by mix.i

Price per Bag (optional)

Rebar Spacing (optional)The distance between reinforcing bars. Smaller spacing means more reinforcement.i

Rebar Price (optional, 20ft stick)

Cement Price (optional, 94lb bag)

Sand Price (optional, per yd³)

Gravel Price (optional, per yd³)

Water Price (optional, per gallon)

Currency

Unit System

LIVE CALCULATION

Order Volume

1.30

Cubic Yards · amount to purchase

Calculated Volume 1.23 yd³

Estimated Waste +0.06 yd³ (5%)

Project Summary

Dimensions-

Area-

Perimeter-

Weight-

Option 1 · Premix Bags

80 lb bags- bags

Rebar (20ft sticks)- sticks

Premix Total-

Option 2 · Mix Your Own (1:2:3)

Cement (94lb bags)Standard Portland cement bags used for the Mix Your Own 1:2:3 mix.i- bags

Sand- yd³

Gravel- yd³

WaterThe amount of water compared with the weight of cement. The calculator uses 0.50 (Water/Cement Ratio) for this estimate.i- gal

Rebar (20ft sticks)- sticks

Self-Mix Total-

Calculation Assumptions

Concrete Density150 lb/ft³

Waste Allowance5%

Premix Bag Size80 lb

Mix Your Own Cement94 lb bags

Mix Ratio1:2:3 (cement:sand:gravel)

Dry Volume Factor1.54

Water/Cement Ratio0.50

Rebar SpacingNot specified

PricingUser-entered material prices

Actual material requirements may vary by material, supplier, mix design, site conditions, and product specifications.