Yard & Slab — Jobsite Material Estimate

Precision US Contractor & Building Material Calculations (yardandslab.com)

Date: October 28, 2026

Standards: US Imperial (ASTM / Quikrete / IRC)

100% US Imperial Standard: All formulas calibrated for US Retail SKUs (80lb/60lb Bags, Cubic Yards, US Tons & Gallons)
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YARD&SLAB US Material Estimators
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Concrete Slab & Bag Estimator

Pre-solved concrete bag calculator for exact slab sizes. Get the exact number of 40lb, 60lb, or 80lb Quikrete bags needed for your project.

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📐 Slab Dimensions & Specifications

10 ft
2 ft 30 ft 60 ft
12 ft
2 ft 30 ft 60 ft
Instant Material Requirement

74 bags (80lb Quikrete)

Total Volume

1.48 cu yd

40 cu ft

Includes 10% waste Total Weight: 5,920 lbs Rebar: 205 lin ft

Dynamic Cross-Section Diagram

10' × 12' × 4"
Compacted Native Subgrade 4" Compacted Gravel Sub-Base (#57 Stone) Poured Concrete Slab (4" Thick · 4,000 PSI) #4 Rebar 10' Length × 12' Width

🛒 Material Shopping List (US Retail SKUs)

80 lb Quikrete Concrete Bags 0.60 cu ft yield per bag
74 bags Check Home Depot ›
60 lb Quikrete Concrete Bags 0.45 cu ft yield per bag
98 bags Check Lowe's ›
#4 Rebar (1/2" Deformed Steel) 18" on-center grid + 10% overlap
~11 sticks (20') 205 linear feet
#57 Crushed Stone Sub-Base 4" compacted gravel lift
2.07 tons Bulk yard supply
👷‍♂️

Don't want to mix 5,920 lbs of concrete by hand?

Compare free, no-obligation bids from top-rated licensed concrete contractors near you.

✓ Matching pre-screened concrete contractors in ZIP . Free quote details requested!
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📐 Engineering Principles & Formulas

All calculations adhere strictly to US Imperial standards and standard retail SKU yields (Quikrete, Home Depot, Lowe's, ASTM standards):

• Cubic Feet = Length (ft) × Width (ft) × [Depth (in) ÷ 12] • Cubic Yards = Cubic Feet ÷ 27 • 80-lb Quikrete Bags = (Cubic Feet ÷ 0.60 cu ft/bag) × 1.10 (10% waste) • 60-lb Quikrete Bags = (Cubic Feet ÷ 0.45 cu ft/bag) × 1.10 • 40-lb Quikrete Bags = (Cubic Feet ÷ 0.30 cu ft/bag) × 1.10 • Rebar Grid = 18" on-center (#4 1/2" steel) with 10% overlap • Break-Even Rule: Total Cubic Yards > 1.75 triggers Ready-Mix Truck alert

Pre-Solved Dimension Calculators

24 Pre-Calculated Sizes

Jump directly to your exact dimensions with pre-solved material quantities and instant answers:

How Many Bags of Concrete for a 4' × 4' Slab (4" Thick)? › How Many Bags of Concrete for a 6' × 6' Slab (4" Thick)? › How Many Bags of Concrete for a 8' × 8' Slab (4" Thick)? › How Many Bags of Concrete for a 8' × 10' Slab (4" Thick)? › How Many Bags of Concrete for a 10' × 10' Slab (4" Thick)? › How Many Bags of Concrete for a 10' × 10' Slab (6" Thick)? › How Many Bags of Concrete for a 10' × 12' Slab (4" Thick)? › How Many Bags of Concrete for a 10' × 12' Slab (6" Thick)? › How Many Bags of Concrete for a 10' × 14' Slab (4" Thick)? › How Many Bags of Concrete for a 10' × 16' Slab (4" Thick)? › How Many Bags of Concrete for a 10' × 20' Slab (4" Thick)? › How Many Bags of Concrete for a 12' × 12' Slab (4" Thick)? › How Many Bags of Concrete for a 12' × 12' Slab (6" Thick)? › How Many Bags of Concrete for a 12' × 14' Slab (4" Thick)? › How Many Bags of Concrete for a 12' × 16' Slab (4" Thick)? › How Many Bags of Concrete for a 12' × 16' Slab (6" Thick)? › How Many Bags of Concrete for a 12' × 20' Slab (4" Thick)? › How Many Bags of Concrete for a 12' × 24' Slab (4" Thick)? › How Many Bags of Concrete for a 14' × 14' Slab (4" Thick)? › How Many Bags of Concrete for a 14' × 16' Slab (4" Thick)? › How Many Bags of Concrete for a 14' × 20' Slab (4" Thick)? › How Many Bags of Concrete for a 16' × 16' Slab (4" Thick)? › How Many Bags of Concrete for a 16' × 20' Slab (4" Thick)? › How Many Bags of Concrete for a 16' × 24' Slab (4" Thick)? ›

🔗 Free Contractor Website Embed Widget

Contractors, builders, and suppliers can embed this interactive Concrete Slab & Bag Estimator on their website for free.

<iframe src="https://www.yardandslab.com/embed/concrete-slab-calculator" width="100%" height="650" frameborder="0" style="border:1px solid #e2e8f0;border-radius:12px;"></iframe>

❓ Frequently Asked Questions: Concrete Slab & Bag Estimator

Yes. Every calculation outputs standard US construction packaging and measurements: cubic yards, 40lb/60lb/80lb Quikrete bags, US short tons (2,000 lbs), fluid ounces, gallons, and linear feet matching Home Depot and Lowe's retail inventory.
Yes. Calculators default to a contractor-standard 10% waste factor to accommodate form flex, uneven subgrades, and spillage. You can adjust this to 5% or 15% using the interactive input controls.
Generic calculators rely on basic geometric boxes without considering physical building realities: corrugated pipe displacement in French drains, actual nominal post sizes (3.5" for 4x4, not 4.0"), 15% compaction factors for crushed aggregate, and IECC US Climate Zones.
Yes! Click the "Print / PDF" button on any calculator to generate a clean, branded one-page materials shopping list formatted for mobile or paper printout at the lumberyard.