Quick Answer: Concrete estimating: compute volume in cubic yards (area x depth / 27), size rebar by bar size from the schedule, measure formwork and finish in SF, deduct openings, price materials with 5% waste, apply your burdened concrete crew rate, add overhead and profit.
Key Takeaways
- Concrete = CY (volume) + rebar (tons/LF) + forms SF + finish SF.
- Volume = area x depth / 27 = CY. Deduct openings.
- Rebar sized from the rebar schedule by bar size and spacing.
- Waste 5%; labor at your burdened concrete crew rate.
Step 1: Measure
Measure slab, footing, wall, and column areas off the drawings, apply section depth for volume in CY (divide by 27). Size rebar by bar size and spacing from the schedule. Measure formwork (contact area) and finish in SF. Deduct openings.
Step 2: Price materials
Ready mix per CY, rebar per ton/LF by bar size, formwork per SF, finish per SF. 5% waste on concrete, rebar, and forms.
Step 3: Price labor
Crew hours per CY and per SF of form/finish times your burdened concrete crew rate ($22-40/hr, varies by region). Add placing, finishing, and curing hours.
Step 4: Add overhead and profit
Overhead 10-20% general, profit 5-15% general. Sanity check per CY and per SF against past concrete jobs.
Concrete estimate build up
| Layer | Basis |
|---|---|
| Quantities | CY + rebar + forms SF + finish SF |
| Materials | Quantities x prices + 5% waste |
| Labor | Crew hours x burdened concrete rate |
| Bid price | Direct + overhead + profit |
Frequently Asked Questions
How do I estimate concrete volume in cubic yards?
Area (SF) x depth (ft) / 27 = CY. Deduct openings. Apply a 5% waste factor.
How do I size rebar from the schedule?
Read bar size and spacing from the rebar schedule, apply to measured lengths/areas, and convert to tons via weight per foot by bar size.
What labor rate for concrete estimating?
Start with $22-40/hr (varies by region). Use your burdened rate, not the wage.
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What this means for your next bid
The point of understanding concrete estimating is not theory — it is what changes on your next bid. When you build up your estimate from real quantities, real material prices, and your real burdened labor rate, you stop guessing and start bidding numbers you can defend. The estimator who can show the math behind every line — the sheet it came from, the price applied, the waste added — wins the tie breakers and sleeps through the job because the numbers were honest from the start.
Where most contractors lose money is in the gap between the bid and the job. That gap is almost always the same things: a labor rate that was the wage and not the burden, a contingency that was folded into profit and then eaten by unknowns, or a quantity that was miscounted because no one verified the flagged items. Each of those is preventable with a build up method you run the same way every time. The method matters more than the tools — but the tools (AI takeoff, your spreadsheet for pricing) make the method fast enough to use on every bid.
For concrete estimating specifically, the move that pays off is treating the takeoff as the foundation and the pricing as the judgment. Get the quantities fast and with confidence flags so you know what to verify; then spend your time on the numbers that actually move the bid — your material prices, your crew's real productivity, your overhead from your books, and your profit set by the risk of the client and the scope. That split is what lets a small team bid like a big one.
Putting it into practice
Here is how to run this on your next project. First, take off every quantity off the drawings — AI takeoff reads the PDFs in seconds and flags anything it is not sure about; if you are doing it by hand, count and measure every unit your trade bills on and write down the sheet each number came from. Second, price materials at your real supplier prices with a waste factor (5 to 15 percent by material), not list prices. Third, apply your burdened labor rate — wages plus taxes, insurance, benefits, and overhead — and a productivity range from your past jobs, not one number. Fourth, add your real overhead (10 to 20 percent general range, from your books) and a contingency line sized by the risk you see in the scope. Fifth, set profit by the market and the risk (5 to 15 percent general range), not a flat number on every bid. Sixth, divide the bid price by the project size and compare it to a benchmark from a past job — if you are way off, find out why before you submit, because a number that looks like a windfall is usually a missed quantity.
The common thread is that every number in your bid ties to something real: a quantity from a sheet, a price from a supplier, a rate from your books, a percentage from your overhead. Nothing is a guess, nothing is a rule of thumb you cannot defend. When a client asks why your number is what it is, you can show the math — and that is what wins the bid over a cheaper guess.
Finally, track what actually happened after the job. Compare your bid to your actual cost, by trade and by line, and feed what you learn back into your next estimate. The estimators who win long term are the ones who close the loop — bid, build, compare, adjust — because every job makes the next bid more accurate. That compounding is the real return, and it is available to any contractor who runs the method consistently, with or without AI tooling. The AI just lets you run it on more bids with the same team.