1:2:4 Concrete Mix Calculator
This 1:2:4 concrete mix calculator converts a target concrete volume into the materials to batch it: cement (in 50 kg bags), sand and coarse aggregate, plus a water estimate at a 0.5 water-cement ratio.
Como usar esta calculadora
- Insira suas dimensões — pés para comprimentos, polegadas 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
Dry volume = wet volume × 1.54, split in 1:2:4 proportions by volume Exemplo resolvido: For 1 m³: dry volume 1.54 m³ ÷ 7 parts = 0.22 m³ cement (≈ 7 × 50 kg bags), 0.44 m³ sand, 0.88 m³ aggregate.
The 1:2:4 mix (1 part cement, 2 parts sand, 4 parts aggregate — residential slabs and footings) is batched by volume: a leaner, more economical mix than 1:2:3 — one cement, two sand, four aggregate. The concrete mixing calculator 1 2 4 ratio math gives about 2,900 psi (M15 class), fine for house slabs, paths and mass concrete.
The 1.54 dry-volume factor matters: mixed concrete compacts, so you need about 54% more loose dry material than the finished volume. Skipping this factor is the classic under-order in hand batching.
Batch consistently — use the same bucket or gauge box for every part, keep the water-cement ratio near 0.5 (about 25 litres per 50 kg cement bag), and mix full bags of cement to avoid weighing errors.
Perguntas frequentes
Perguntas comuns sobre a 1:2:4 concrete mix calculator.
What is a 1:2:4 concrete mix?
Parts by volume — 1 part cement, 2 parts sand, 4 parts aggregate — residential slabs and footings. a leaner, more economical mix than 1:2:3 — one cement, two sand, four aggregate. The concrete mixing calculator 1 2 4 ratio math gives about 2,900 psi (M15 class), fine for house slabs, paths and mass concrete.
How strong is a 1:2:4 mix?
Roughly 2,200–2,900 psi (M15 class) at 28 days — fine for residential slabs, paths and mass fill.
How much water do I add?
Target a 0.5 water-cement ratio: about 25 litres per 50 kg bag of cement. Add most of the water first, then trim to a workable, not soupy, consistency.
Why multiply by 1.54?
Loose cement, sand and aggregate contain air voids that close up when mixed and compacted — 1 m³ of finished concrete consumes about 1.54 m³ of loose dry ingredients.
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