Is It Cheaper to Pour Your Own Concrete Slab?

Can you save money by pouring your own concrete slab? The honest answer depends on which costs you take on yourself, and on what a written quote would charge for the same work.

Which Costs a DIY Pour Changes

A DIY pour swaps some costs for your own time, skill, and risk. It does not remove the price of the concrete. Sort each cost into one of two groups: lines you take on yourself, and lines you still compare against a quote.

Timing is a cost too, even though it never shows on a bill. A ready-mix truck arrives at a set time, and the crew and tools must be ready when it does. A late start can leave a truck waiting, and that is when a wait or standby fee applies.

The Concrete Slab Cost Calculator keeps each line as its own input, so you can change one at a time and watch the total move.

Labor is the line people forget to price. Entering zero for labor treats your time as free, which understates the job’s cost. Decide what your hours are worth, and enter that as your labor rate.

How the Tool Sizes the Concrete Volume

Volume comes first, because the concrete line depends on it. Multiply length by width to get area in square feet. Divide thickness in inches by 12 to get depth in feet. Multiply area by depth, divide by 27 to get cubic yards, and add waste last.

Check your size in the concrete volume calculator before you price anything. A wrong volume carries straight into the material line.

After volume, the other lines follow. Material is cubic yards times your price per cubic yard. Labor and finishing are area times their rates. Flat extras are added once, and the total is all four lines added together.

Ordering Ready-Mix and the Volume Error

Ready-mix is sold by the volume of fresh concrete, so your depth figure sets the order. NRMCA’s CIP 8 sheet says so, under ASTM C94. It also notes that hardened concrete may be about 2 percent less than its volume in a freshly mixed state.

CIP 8 gives one small-error example. A 1/8-inch error in a 4-inch slab, it says, would mean “a shortage of 3 percent or 1 yd3 in a 32-yd3 order.” That example covers that slab and that order only. Do not stretch it to other sizes.

Measure the forms at more than one point, then write down the length, width, and depth you used. That record lets you check the order against the tool and against the quote.

CIP 8 also advises ordering 4 to 10 percent extra for waste. The calculator page calls 5 to 10 percent typical. Choose the figure that fits your forms, your cuts, and your spill risk.

NRMCA’s CIP index lists a sheet titled Ordering Ready Mixed Concrete (revised) as CIP 31. This article cites that title only, because the sheet itself was not read.

What Regional Pricing Means for Your Bill

Ready-mix prices vary by place. In January 2013, the Bureau of Labor Statistics (BLS) created regional price indexes for ready-mix concrete. It did so because prices for this product tend to move with local market conditions.

In practice, the number you need is a quote from a supplier near your site. This guide gives no national price per cubic yard, because none is verified here.

The BLS notice explains why prices move by place. It does not give a price for your slab, so treat any price you enter in the tool as your own input, not a benchmark.

Working Through the Example Figures

The calculator’s own example is a 12 by 12 foot slab, 4 inches thick, with 10 percent waste. It uses three figures that you should treat as examples: $160 per cubic yard (an example price, not a quote), $4 per square foot for labor, and $1 per square foot for finishing.

The steps below are hand-checked. Money is rounded only at the end of each line.

1. Area and depth. 12 x 12 = 144 square feet. Depth is 4 / 12 = 1/3 foot, so 144 x (4 / 12) = 48 cubic feet.
2. Volume. 48 / 27 = 1.7778 cubic yards. With 10 percent waste, 1.7778 x 1.1 = 1.9556 cubic yards, which the page shows as 1.96.
3. Material. Use the unrounded volume, 52.8 / 27 = 1.95556 cubic yards. Times $160 gives $312.89. Rounding to 1.96 first would give $313.60.
4. Labor. 144 x $4 = $576.00.
5. Finishing. 144 x $1 = $144.00.
6. Total. $312.89 + $576.00 + $144.00 = $1,032.89. Per square foot, $1,032.89 / 144 = $7.17.

In this example, material is $312.89 of the $1,032.89 total, about 30 percent. The page describes concrete as about a third of this example bill. The arithmetic puts it a little under a third.

Compare two changes. Raising labor by $1 per square foot adds $144.00 to the total. Cutting waste from 10 percent to 5 percent lowers material to $298.67, which is about $14.22 less, since 48 / 27 x 1.05 x $160 equals $298.67. The rate you enter matters more than the waste figure here.

Only the arithmetic carries over to your slab. Swap in your own dimensions, quote, and rates, and the same steps apply.

Checking a Contractor Quote Against Your Numbers

Compare line by line, not by total. A lump-sum quote cannot be checked against the tool’s lines, so ask for a breakdown first. Two quotes can also assume different sizes, so recalculate both with the same dimensions before you compare totals.

Ask for these items in writing:

• Volume. The cubic yards and the waste allowance the quote uses.
• Concrete price. The price per cubic yard, with the supplier named.
• Fees. Any short-load, distance, wait, after-hours, fuel, or minimum order charges.
• Labor and finishing. The labor and finishing lines, with any rate per square foot.
• Flat extras. Formwork, rebar, excavation, or removal, each on its own line.
• Assumed size. The area and thickness the quote is based on.

The concrete cost calculator covers volume and fee lines, so you can set your own figures beside the quote’s. Ask the contractor what the price includes. This article cannot say, because that is not verified.

What Is Not Verified

This article gives no figures for the points below, because their sources were not verified. Check each one with your supplier, your contractor, or your local rules before you decide.

• DIY labor hours, and how long a hand pour takes.
• Your working time, and the minimum ready-mix load in your area.
• The required slab thickness, and the vapor retarder thickness.
• What a contractor’s price includes.
• Whether a DIY pour is cheaper in any area.

Before you order, compare ready-mix with bagged concrete in the ready-mix versus bagged concrete guide.

FAQs About Doing Your Own Concrete Slab

Sources and Further Reading

A DIY-versus-quote answer depends on figures from your own area and your own quotes. The example figures in this article are arithmetic, not market prices. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated 2026-11-07.