Concrete, Roof & Material Estimator

Calculate concrete slab volume and bag counts, determine roof pitch slopes and angles, or estimate stud framing requirements for DIY projects.

Concrete slab mode starts with length, width, thickness, cubic yards, bag counts, and material cost, but it does not replace a contractor takeoff.

Material estimate only. Add waste, check local code, product coverage, load requirements, and site conditions before ordering or building.

Required Construction Materials

1.23Cubic Yards Required
Cubic Meters0.944 m³
80 lb / 60 lb bags56 / 75 bags
Estimated Cost$154.32

Estimating Steps:

1. Volume (cu ft) = 10 × 10 × (4/12) = 33.33 ft³
2. Volume (cu yards) = 33.33 / 27 = 1.23 yd³
3. Bags of concrete needed:
   - 80 lb bags (0.6 cu ft capacity) ≈ 56 bags
   - 60 lb bags (0.45 cu ft capacity) ≈ 75 bags

Frequently Asked Questions

How many bags of concrete make a cubic yard?

It takes about 45 80-pound bags or 60 60-pound bags of premixed concrete to equal one cubic yard before waste or product-specific yield adjustments.

What is a standard roof pitch?

Residential roof pitches typically range from 4/12 (low slope) to 9/12 (steep). A 4/12 pitch means the roof rises 4 inches for every 12 inches of horizontal run.