Concrete Calculator with Cost
Concrete volume and cost for any shape — slab, footing, column, wall, stairs
What is concrete cost calculator?
A concrete cost calculator turns your pour dimensions into a budget. Unlike a plain concrete calculator (which just gives you yards and bags), this version layers your local rate on top and tells you what the project will actually cost — material only, or installed all-in. The math splits cleanly: material cost = volume × $/cu yd (or × $/bag for DIY); installed cost = footprint area × $/sq ft.
The tool covers every common residential pour through the shape tabs: slabs (patios, driveways, garage floors, basement floors), footings (foundation perimeter, column footings, pier footings), columns and sonotubes, walls (foundation walls, retaining walls, knee walls), and stairs. Each shape’s volume math has been validated against the cured-density and bag-yield tables published by Quikrete and Sakrete — see the related Concrete Calculator for the underlying formulas. The cost layer is the same across all shapes; only the volume math changes.
Material mode is for sanity-checking a ready-mix quote. Get the plant’s per-yard price, enter your dimensions, and compare totals. If the quote is 30% above national average ($240+/yd in 2026), check what mix design you’re getting — high-strength or fiber-reinforced mixes carry premiums. Installed mode is for sanity-checking contractor bids. Convert their bid to dollars-per-square-foot and compare to the $6-12/sq ft residential band. Anything outside that band needs an explanation.
Bag mode is for DIYers. Switch the unit dropdown to “per 80-lb bag” and enter your big-box-store bag price. The tool reports total bag count and total bag cost — and you can compare directly to the ready-mix number by toggling the unit. The break-even is usually around 30-40 bags (about 1 cu yd); below that, bags are cheaper because ready-mix has a delivery minimum.
This tool doesn’t price pumping, demolition, or decorative finishes. Pumping adds $750-1,500 per pour day when the truck can’t reach the forms. Demolition of an old slab is typically $2-3/sq ft on top of the new pour. Stamping, staining, or exposed-aggregate finishes add $3-8/sq ft over a plain slab. Treat the calculator’s output as the structural-concrete number and add line items for the extras.
When to use a concrete cost calculator
- Whole-house concrete budget — Pour foundation footings, basement walls, and a garage slab in one project. Tab through Slab → Footing → Wall to total each pour; the cost line keeps a running per-section figure.
- Quote comparison — Three contractors, three numbers. Plug your dimensions and an installed rate ($/sq ft) and you'll know which quote is normal, which is high, and which sounds too good.
- Bag-vs-ready-mix break-even — Switch the unit dropdown from 'per cu yd' to 'per 80-lb bag', enter $5.50/bag, and compare. Below 1 yd bags often win; above 1.5 yd, ready-mix almost always does.
How to use the Concrete Calculator with Cost
- Choose the pour shape — Slab, footing, column, wall, or stairs — tab through to the matching shape. Each shape's dimensions feed into the same volume math.
- Enter dimensions and waste factor — Slab dimensions in feet plus inches for thickness; footings in inches for cross-section. Default 10% waste covers spillage, uneven subgrade, and absorption.
- Pick a price mode — Material mode quotes the concrete itself. Installed mode (slabs and footings only) quotes the all-in $/sq ft. For columns, walls, and stairs, only material mode is meaningful.
- Compare quotes — Divide a contractor's bid by your square footage. If it's outside $6-12/sq ft for residential slab work, ask what's included before agreeing.
Worked examples
Footing: 30 ft × 16 in × 12 in — material
Input: Footing tab: L 30, W 16 in, D 12 in. Material rate: $185/cu yd
Output: 1.48 cu yd · $273.80 in concreteWall: 30 × 8 ft × 8 in — material
Input: Wall tab: L 30, H 8, T 8 in. Material rate: $185/cu yd
Output: 5.93 cu yd · $1,096.50 in concreteSlab: 20 × 20 × 4 in — bag mode at $5.50/bag
Input: Slab tab: 20 × 20 × 4. Material rate: $5.50/80-lb bag
Output: 138 80-lb bags · $759.00 in bags (compare: $456 ready-mix)