# How to Estimate Concrete Work (2026 Contractor Guide) Canonical URL: https://www.simplywise.com/blog/how-to-estimate-concrete-work/ Plain text: https://www.simplywise.com/blog/how-to-estimate-concrete-work/llms.txt Publisher: SimplyWise, Inc. (https://www.simplywise.com) Published: July 31, 2026 Updated: October 5, 2026 Category: How to Estimate Summary: How to estimate concrete work in 2026: cubic-yard math, PSI and mix, rebar and forms, finishes, joints, and labor, with a worked example. --- ## How to Estimate Concrete Work in 8 Steps The cubic-yard math, the waste allowance, the mix spec, and the delivery fees that quietly eat a pour. Sourced from federal wage data and ready-mix industry guidance. How to estimate concrete work at a glance 1. Run the cubic-yard math: length times width times thickness in feet, divided by 27. 2. Add a 4 to 10 percent waste allowance so you never order short. 3. Spec the mix: strength, slump, and air entrainment. 4. Take off the steel, the forms, and the compacted base. 5. Scope the finish and the saw-cut control joints. 6. Price the short-load fee, the pump, and standby time. 7. Load the crew rate instead of using the base wage. 8. Price the cure and seal trip, then stack overhead and profit. ## Why concrete bids lose money before the truck arrives Concrete is unforgiving. It is ordered in bulk and placed once, so you cannot send half a truck back. Order short and you get a cold joint or a second short-load charge. Order long and you pay for the wash-out. The cubic-yard number is the easy part. The base, the steel, the forms, the finish labor, and the delivery surcharges decide the margin, and those are the lines a rushed estimate drops. The Bureau of Labor Statistics (https://data.bls.gov/oesprofile/?major_group=470000&occupation=472051&measure=01&areas=INDUSTRY,STATE,MSA) puts the median wage for cement masons and concrete finishers at $27.41 an hour as of May 2025. Ready-mix sells by volume under National Ready Mixed Concrete Association (https://www.nrmca.org/wp-content/uploads/2021/01/31pr.pdf) guidance. ## How to estimate concrete work in 8 steps 1. Run the cubic-yard math Ready-mix is billed by volume, so start there. Multiply length times width times thickness, all in feet, then divide by 27. Convert thickness first, using the decimals in the table below. That is one multiplication you can do standing on the site. 2. Add the waste allowance The National Ready Mixed Concrete Association tells purchasers to order 4 to 10 percent more concrete than the plan-dimension estimate. Sit high in that band on small pours and rough subgrade, then round up to the nearest quarter yard. 3. Spec the mix The plant prices by strength and additives. Code sets the floor at 2,500 PSI for interior slabs and 3,500 PSI for garage slabs and steps in severe weathering regions, but the practical band runs 3,500 to 5,000 PSI. Name the slump, 3 to 5 inches on most work, and air entrainment at 5 to 7 percent where it freezes. 4. Take off steel, forms, and base Concrete is only part of the material cost. Price the wire mesh or tied rebar grid, plus tie wire and chairs, and the form lumber and stakes by the linear foot. Then the base: code calls for a 4-inch compacted course of sand, gravel, or crushed stone under a slab below grade. 5. Scope the finish and the joints Two slabs of the same volume can carry very different labor. Broom is the residential default. Stamped and colored multiplies it, adding release powder, mats, color hardener, and a sealer coat. Joint spacing runs 24 to 36 times the slab thickness, about 10 feet on a 4-inch slab, capped at 15 feet. 6. Price the delivery realities Plants bill for things volume does not cover. A truck mixer holds 8 to 12 cubic yards, so a small patio pour trips the short-load surcharge. A backyard slab needs a pump with its own minimum. Under ASTM C94 the producer is responsible for the specified slump for 30 minutes, starting when the truck arrives or at the requested delivery time, whichever is later. Ask your plant what its free unloading allowance is and what it bills past it. 7. Load the crew rate Price the business, not the paycheck. The median wage for cement masons and concrete finishers is $27.41 an hour as of May 2025, with the 90th percentile at $41.10. Your billed rate has to clear that once payroll taxes, workers comp, liability, vehicle, and tools ride on top. 8. Price the cure, the seal, and the margin Curing runs 3 to 7 days with the slab held above 50 degrees Fahrenheit, so carry the compound, the blankets or sheeting, and the return trip to seal. Then stack overhead and profit on the whole direct cost. ### Slab thickness in decimal feet | Thickness | Decimal feet | Typical use | | --- | --- | --- | | 4 inch | 0.333 ft | Patios, sidewalks | | 5 inch | 0.417 ft | Residential driveways | | 6 inch | 0.5 ft | Heavy-vehicle driveways | | 8 inch | 0.667 ft | Footings, walls | ## What it costs out on a 20 by 30 driveway The pad is 20 feet by 30 feet, so 600 square feet at 5 inches, or 0.417 feet. That is 250 cubic feet, and dividing by 27 gives about 9.26 cubic yards. Add 8 percent for waste and you order 10 yards. Then say direct cost lands at 4,000 dollars, overhead at 20 percent, and net margin at 10 percent. Divide 4,000 by 0.70 and the customer sees about 5,715 dollars, a markup of roughly 43 percent. Full breakdown in the cost to pour a concrete driveway guide. ## Price a pour from a photo with SimplyWise Half of these steps are math and speed. Snap a photo of the pour area and the SimplyWise Cost Estimator turns it into an itemized estimate in about 6 seconds, and you edit the line items before it goes out. On iPhone Pro models you can use the LiDAR room scan to capture measurements. You hand over a professional, branded quote the customer signs before you leave, at $29.99/mo with a 7-day free trial. ## Sources - U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, Cement Masons and Concrete Finishers (47-2051), May 2025 (https://data.bls.gov/oesprofile/?major_group=470000&occupation=472051&measure=01&areas=INDUSTRY,STATE,MSA). - National Ready Mixed Concrete Association, CIP 31 Ordering Ready Mixed Concrete (https://www.nrmca.org/wp-content/uploads/2021/01/31pr.pdf). - National Ready Mixed Concrete Association, CIP 6 Joints in Concrete Slabs on Grade (https://www.nrmca.org/wp-content/uploads/2021/01/06pr.pdf). - National Ready Mixed Concrete Association, CIP 11 Curing In-Place Concrete (https://www.nrmca.org/wp-content/uploads/2021/01/11pr.pdf). - 2021 International Residential Code, Section R402.2 (https://codes.iccsafe.org/content/IRC2021P2/chapter-4-foundations), concrete strength and air content. - 2021 International Residential Code, Section R506.2 (https://codes.iccsafe.org/content/IRC2021P2/chapter-5-floors), base course under a slab. ## Frequently asked questions about estimating concrete work ### Volume and mix **How do you estimate concrete work?** In 8 steps: run the cubic-yard math, add a 4 to 10 percent waste allowance, spec the mix, take off steel, forms, and base, scope the finish and joints, price delivery fees, load the crew rate, then price the cure and stack overhead and profit. **How do you calculate cubic yards of concrete?** Multiply length times width times thickness in feet, then divide by 27. A 4-inch slab is 0.333 feet, 5 inches is 0.417, and 6 inches is 0.5. A 20 by 30 foot driveway at 5 inches is about 9.26 cubic yards before waste. **What PSI concrete do I need for a driveway?** No single code minimum covers residential driveways, so use the plant band: the National Ready Mixed Concrete Association puts typical specified strength at 3,500 to 5,000 PSI. Add air entrainment anywhere it freezes. ### Delivery **What is a short-load fee on concrete?** Plants set a minimum load and bill a per-yard surcharge on anything under it. A truck mixer holds 8 to 12 cubic yards, so a small patio pour almost always trips it. --- ## About SimplyWise SimplyWise, Inc. (New York, NY) builds mobile apps for contractors, tradespeople, and small business owners. The SimplyWise Cost Estimator turns a job site photo into an itemized estimate with labor and material costs in about 6 seconds, and the client signs the branded quote to approve it. It is rated 4.8 on the App Store. It is free to try with a 7-day free trial, then $29.99 per month or $239.99 per year (about $20 per month on the annual plan), and one subscription includes every app in the SimplyWise suite. - Download: https://www.simplywise.com/download - App Store: https://apps.apple.com/us/app/simplywise-cost-estimator/id6670619664 - Google Play: https://play.google.com/store/apps/details?id=com.simplywise.costestimator - Every SimplyWise page as plain text: https://www.simplywise.com/blog/llms.txt