30 kg Concrete Calculator
This 30 kg concrete calculator converts your pour's dimensions straight into a bag count: one 30 kg bag yields about 15.0 litres (0.0150 m³) of mixed concrete, so the tool divides your volume by that yield and rounds up with waste.
Como usar esta calculadora
- Insira suas dimensões — metros para comprimentos, centímetros para a espessura.
- Ajuste as opções — porcentagem de desperdício, tamanho do saco e o preço local do concreto.
- Leia seus resultados — volume, sacos, peso e custo são atualizados ao vivo enquanto você digita.
A fórmula
Bags = volume ÷ 15.0 litres (0.0150 m³) per bag, rounded up (+5–10% waste) Exemplo resolvido: A 3 m × 3 m slab at 10 cm = 0.9 m³ → 0.9 ÷ 0.0150 ≈ 61 × 30 kg bags before waste.
The 30 kg bag is the common Canadian format. A concrete calculator 30 kg bag estimate uses ≈ 15 litres of yield per bag — 67 bags per cubic meter, or about 51 bags per cubic yard. At 30 kg (66 lb) per bag, plan your lifting and consider delivery for anything over 20 bags.
Reference numbers for 30 kg bags: 51 bags make one cubic yard, 67 bags make one cubic meter. Keep those in your head at the store and you can sanity-check any estimate.
Bagged concrete makes sense up to roughly one cubic yard. Beyond that, price out ready-mix — mixing 45+ bags by hand is a full day of hard labor and the per-yard cost usually favors the truck.
Perguntas frequentes
Perguntas comuns sobre a 30 kg concrete calculator.
How much concrete does a 30 kg bag make?
About 15.0 litres (0.0150 m³) of mixed concrete, per standard manufacturer yield data.
How many 30 kg bags in a cubic meter?
67 bags per cubic meter (1 ÷ 0.0150 m³, rounded up).
How many 30 kg bags for a fence post?
A 300 mm hole 600 mm deep needs ≈ 0.042 m³ — about 3 bags per post.
Should I add extra bags?
Yes — buy 5–10% more than calculated. Unopened bags return easily; a mid-pour shortage doesn't.
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