Concrete Calculators: Every Tool You Need for Your Concrete Project
Concrete is priced and delivered by the cubic yard, but almost every real-world concrete project starts with dimensions in feet and inches — length, width, thickness, or in the case of round forms, diameter and depth. The gap between those two units is where most estimating mistakes happen, whether that means an extra delivery fee for running short or paying for yardage that gets wasted.
This page brings together all 8 of our free concrete calculators, each with a complete guide covering the underlying formulas, standard depth and reinforcement rules, and the waste factors professional concrete contractors actually use. Use these to plan a pour, double-check a contractor’s quote, or figure out exactly how many bags to buy for a smaller DIY project.
All Calculators & Guides
Concrete Slab Calculator
Calculate cubic yards or bags needed for a patio, walkway, or slab from length, width, and thickness.
Concrete Driveway Cost Calculator
Estimate total driveway cost by combining concrete yardage with per-square-foot finishing labor.
Concrete Footing Calculator
Calculate footing volume and check your depth and width against frost-line requirements.
Concrete Column & Pier Calculator
Calculate cylinder volume for Sonotube deck piers and round column forms.
Concrete Mix Ratio Calculator
Convert a mix ratio like 1:2:3 into real quantities of cement, sand, and gravel.
Rebar Calculator
Calculate rebar grid layout, total linear footage, and how many 20 ft sticks to order.
Gravel Base Calculator
Calculate compacted gravel base depth, cubic yards, and tonnage under a slab.
Concrete Stairs Calculator
Calculate the true stacked volume of a set of solid concrete steps, plus rise-and-run guidance.
Frequently Asked Questions
Which concrete calculator should I use for a patio?
Use the Concrete Slab Calculator for the pour itself, and the Gravel Base Calculator first if you’re planning a compacted base underneath — most patios need both.
Do the concrete calculators include a waste factor?
Yes, each includes an adjustable waste factor field. 5–10% is standard for most slab and footing pours to account for uneven sub-grade and material left in the mixer or wheelbarrow.
Can these calculators tell me if my footing meets code?
No — they estimate material quantity based on the dimensions you enter. Footing depth and width requirements are set by your local building code and frost line, which you should confirm with your local building department or an engineer before pouring.