Our Concrete Calculator

At Home Lumber and Supply, we understand that planning your concrete projects—whether it's a patio, steps, or footings—can be challenging. That’s why we’re offering our easy-to-use Concrete Calculator, designed to help contractors, DIYers, and homeowners estimate the right amount of concrete needed for their projects.

Our calculator allows you to quickly input dimensions for different concrete structures, including:

Patios – Enter the length, width, and thickness of your slab to determine the cubic yards of concrete required.

Steps – Calculate the concrete volume needed for multiple steps based on width, depth, height, and the number of steps.

Footings – Input your footing length, width, and depth to ensure you have the correct amount of concrete for a solid foundation.

HOME LUMBER & SUPPLY

Build a solid start.

Estimate concrete for slabs, footings, columns and steps—all in one place.

1. Add your project sections

Use finished concrete dimensions. Add separate sections for different shapes or sizes, without overlapping their volumes.

2. Allow for extra concrete

10% is an adjustable starting allowance, not a guarantee. Confirm extra volume and order increments with your supplier. Bag counts use volume with allowance, before ready-mix rounding.

3. Choose a bag size

Use concrete mix, not cement alone. Default yields: 40 lb = 0.30, 60 lb = 0.45, 80 lb = 0.60 cu ft. Check the selected product label and adjust its yield if needed.

Optional material pricing

Compare bagged mix and ready-mix as alternatives. Enter your own prices; delivery, labor and other costs are excluded.

IMPORTANT ESTIMATING DISCLAIMER

This calculator provides preliminary volume and material estimates only, not a quote, guaranteed order quantity, structural design or installation plan. Results depend on user-entered dimensions, selected allowance and assumed product yields. Actual needs may vary with excavation, uneven subgrade, forms, spillage, consolidation and product yield. Do not count overlapping sections twice. Step calculations assume solid concrete stairs filled to a level base, with no hollow areas or separate landing. This tool does not determine suitable thickness, footing size, reinforcement, mix strength, soil capacity or code compliance. Have a qualified professional verify project dimensions, design requirements, quantities and manufacturer instructions before ordering or pouring. Unless expressly included, prices exclude reinforcement, forms, base materials, labor, equipment, delivery, short-load charges, pumping, disposal and taxes. Entered prices are user-supplied allowances, not Home Lumber prices or offers. Home Lumber & Supply does not guarantee the accuracy or completeness of results. Confirm final quantities, pricing and availability with your supplier; do not order solely from this estimate.

© Home Lumber & Supply

Disclaimer:
The Home Lumber & Supply Concrete Calculator is designed as a helpful guide to estimate concrete materials and costs. Actual material needs may vary based on factors such as roof shape, waste, and specific installation methods. We strongly recommend verifying all calculations with a professional before making purchasing decisions. Home Lumber & Supply is not responsible for miscalculations or incorrect estimations.