At 10% waste, 660 L requires 55 whole bags before checking supplier guidance.
Home & Construction calculator
Concrete Bags and Cost Calculator
Turn slab dimensions into wet concrete volume, then use the bag's stated yield and price for a purchase estimate.
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Concrete bags & cost details
Formula & disclaimer
Bags = Ceiling(Slab Volume Γ (1 + Waste) Γ 1,000 Γ· Concrete Yield per Bag); Cost = Bags Γ Price
View assumptionsFormula reviewCalcs at Hand Editorial TeamVerified 1 September 2026 Β· automated checks included
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How to read this result
Three useful checks, kept deliberately short.
A 3 m Γ 2 m slab, 10 cm thick, with 12 L yield bags: Calculate 0.6 mΒ³ wet volume Β· Add the waste allowance Β· Divide litres by bag yield and round up.
Large pours may be more practical as ready-mix concrete; the result covers bag material only.
Formula and assumptions
Bags = Ceiling(Slab Volume Γ (1 + Waste) Γ 1,000 Γ· Concrete Yield per Bag); Cost = Bags Γ PriceUse the hardened or wet yield printed on the premix bag rather than the bag's dry mass.
Keep in mind: This is a material estimate. Confirm mix suitability, structural design, actual bag yield, delivery method and site waste with the supplier or contractor.
Produced byCalcs at Hand Editorial Team
Last formula check1 September 2026
Review methodKnown examples + boundary cases
Editorial and correction policy β