10 Inch Cinder Block Calculator — Mid-Size CMU
Estimate 10-inch CMU blocks and mortar for moderate-load basement walls, mid-rise retaining walls, and engineered partition applications with waste factor.
Enter Dimensions
Recommended: 10% for standard projects
Results
Blocks Needed
199blocks
Mortar Bags
7bags
60 lb bags · 1 bag per 30 blocks (NCMA)
Wall Area
160sq ft
Blocks per Sq Ft
1.125blocks/sq ft
BIA standard for 8×16 face
Editorial Standards
Each calculator is reviewed for formula accuracy, unit consistency, and alignment with current U.S. building practices before publication. We verify outputs against published engineering references and real-world project data. Learn more about our methodology.
10 inch CMU is the lesser-known middle option — heavier than 8 inch (more capacity) and lighter than 12 inch (lower material cost and weight). It's specified where prescriptive tables call for it: basement walls retaining 5-6 ft of soil, moderate retaining walls, and load-bearing walls under engineered review.
Availability is the catch — many residential suppliers stock only 8 and 12 inch CMU. Verify before committing.
How to Estimate 10 Inch Cinder Blocks
Blocks = Wall Area × 1.125 × (1 + waste %). Grout (fully) = Area × 1.06 cu ft/sq ft.
10 Inch CMU Quick Reference
- Nominal: 10 × 8 × 16 inch
- Actual: 9-5/8 × 7-5/8 × 15-5/8 inch
- Weight: ~40 lb hollow / ~70 lb solid
- Coverage: 1.125 blocks per sq ft (same as 8 and 12 inch)
- Grout (fully): 1.06 cu ft per sq ft wall
- Common uses: moderate retaining walls, basement walls 5-6 ft retained
- Pallet: 72-90 blocks
- Availability: verify with supplier; not as widely stocked as 8/12 inch
Frequently Asked Questions
When do I need 10 inch CMU?
10 inch CMU bridges the gap between standard 8 inch and heavy 12 inch — used for moderate retaining walls (4-6 ft), basement walls with 5-6 ft retained fill, and load-bearing walls under moderate roof/floor loads. Per IRC R404.1 prescriptive tables.
How heavy is a 10 inch CMU?
Hollow 10×8×16 inch CMU: ~40 lb each. Solid: ~70 lb. Heavier than 8 inch (30 lb) but lighter than 12 inch (50 lb).
Is 10 inch CMU commonly available?
Less common than 8 inch or 12 inch — many residential suppliers stock 8 and 12 inch only. Verify availability with your supplier before specifying 10 inch; lead times of 1-2 weeks aren't unusual.
How does 10 inch compare in concrete grout volume?
Fully grouted 10 inch CMU consumes ~1.06 cu ft of grout per sq ft of wall face (vs 0.86 for 8 inch and 1.30 for 12 inch). Partial grouting at 24 inch OC: ~0.32 cu ft per sq ft.
How many 10 inch blocks per pallet?
Typically 72-90 blocks per pallet. Smaller than 8 inch pallets (90-108) due to higher per-block weight.
Looking for the general calculator?
Estimate cinder blocks and mortar bags for any CMU wall. Supports 8-inch and 12-inch blocks with adjustable waste percentage and automatic pallet estimation.
Open the Cinder Block Calculator: Blocks & Mortar →