Quick answer
- Enter slab length, width, and depth in the Concrete Takeoff tool.
- Select the bag size or yield used by your supplier.
- Add a waste allowance and order the rounded-up bag count.
Inside the App
The workflow at a glance
This image is from the current Construction Pro project and shows the product interface behind this guide.
Step by Step
Estimate Concrete Bags With Waste
Follow the sequence and keep units visible at every handoff.
Step 1
Measure the pour
Use actual inside dimensions and planned depth. Split irregular work into simple slabs, footings, or piers.
Step 2
Open Concrete Takeoff
Choose the matching shape and enter every dimension in the labeled unit.
Step 3
Set bag yield and waste
Use the yield printed on the bag or supplied by the ready-mix provider. Add a realistic waste percentage for grade variation and handling.
Step 4
Act on the order quantity
Use cubic yards for ready mix and the rounded-up bag count for bagged concrete. Never order a fraction of a bag.
Field Examples
Three practical checks
Example 1
Small pad
A 10 ft × 10 ft × 4 in slab is about 1.23 yd³ before waste.
Example 2
Bagged repair
Use the selected bag yield; the app converts volume to whole bags and includes the waste setting.
Example 3
Multiple sections
Calculate each simple section, save the results, then combine the order instead of guessing one irregular volume.
Common mistakes
What to verify
- Entering slab depth in feet when the field is labeled inches.
- Using nominal dimensions that do not match the excavated pour.
- Adding waste mentally after rounding, which can understate the final whole-bag order.
Related guides
Keep working
Can I use this result without checking it?
No. Confirm measurements, units, assumptions, and applicable code before cutting material, ordering supplies, or issuing a quote.
Does Construction Pro guess missing values?
No. Its calculators use explicit formulas and the inputs you provide; missing field conditions still require professional judgment.
Can I keep the calculation with a job?
Yes. Save verified calculations in a project and add a descriptive note so the crew can see what the result means.
Build Faster On Site
Download on the App StoreTake Construction Pro to the jobsite
Use feet-inch math, rafter tools, material estimates, and saved calculations from one construction calculator.