Calculator
conversion
%
Applied as extra required when sizing bags for a target volume.
Override factory yield if your brand mix differs.
Results
| Mode | Bag size | Input | Yield per bag (yd³) | Waste / Overage | Output |
|---|---|---|---|---|---|
| Notes | |||||
Default yields: 40 lb → 0.01111 yd³, 60 lb → 0.01667 yd³, 80 lb → 0.02222 yd³.
Formula used
- yd³ per bag defaults: 40→0.01111, 60→0.01667, 80→0.02222.
- Bags → Cubic yards: volume_yd3 = bags × yield_yd3_per_bag.
- Cubic yards → Bags (with overage): bags = target_yd3 × (1 + waste%) ÷ yield_yd3_per_bag.
- If custom yield is provided in ft³, it converts to yd³ using yd³ = ft³ ÷ 27.
Real yield varies with slump, compaction, and air content. Consider local practice.
How to use
- Choose a conversion mode.
- Select a bag size or enable a custom yield.
- Enter bag count or target volume and optional overage.
- Click Calculate. See results and notes below.
- Export the results table as CSV or PDF if needed.
Example data table Sample
| Mode | Bag size | Input | Waste % | Output |
|---|---|---|---|---|
| Bags → Yards | 60 lb | 20 bags | 0% | |
| Bags → Yards | 80 lb | 50 bags | 0% | |
| Yards → Bags | 40 lb | 1.00 yd³ | 10% | |
| Yards → Bags | 80 lb | 2.50 yd³ | 5% |
FAQs
Yes. Bagged mixes vary by cement content, aggregate grading, and air entrainment, which change the placed volume. Use the custom yield option if your bag’s datasheet differs.
Spillage, voids, variable subgrade absorption, and trimming usually increase consumption. Many estimators add 5–10% depending on placement method and site conditions.
The yields shown are typical placed (wet) volumes per bag, not dry powder volume. Manufacturers state approximate yields assuming proper mixing and placement.
This tool reports cubic yards. Use custom yield in ft³ per bag, or multiply final yards by 27 for ft³ and by 0.7646 for m³.
Yes. Higher water reduces density and can appear to change volume. However, overwatering harms strength and durability; follow the datasheet precisely.
Results are rounded for readability. For ordering, round up bags to whole numbers; for volume, coordinate with your supplier’s minimum batch size.
You can export the results as CSV or PDF. For persistent projects, copy the inputs or embed this file within your site’s preferred page template.