Concrete Yield Calculator
This concrete yield calculator implements the ACI 138 check: yield = total batch mass ÷ measured fresh density. Compare it to the volume you ordered to get relative yield — the number that tells you whether loads are running short.
Cómo usar esta calculadora
- Introduzca sus dimensiones — pies para longitudes, pulgadas para el espesor.
- Ajuste las opciones — porcentaje de desperdicio, tamaño de la bolsa y el precio local del hormigón.
- Lea sus resultados — el volumen, las bolsas, el peso y el costo se actualizan en vivo mientras escribe.
La fórmula
Yield (m³) = total batch mass (kg) ÷ fresh unit density (kg/m³); Relative yield = yield ÷ design volume Ejemplo resuelto: A 4,800 kg batch at 2,400 kg/m³ measured density yields 2.00 m³. Ordered 2 m³? Relative yield = 1.00 — exactly on spec.
Yield is the quality-control side of concrete volume: the plant batches by mass, but you pour by volume. If the measured fresh density runs higher than the design density, the same mass fills less volume — the load under-yields and your pour comes up short.
To measure density in the field, weigh a container of known volume filled with fresh, consolidated concrete (the standard unit-weight bucket test, ASTM C138). Enter total batch mass from the delivery ticket.
Relative yield between 0.98 and 1.02 is normal. Persistent under-yield across loads is worth a conversation with the supplier — you're paying for volume you're not receiving.
Preguntas frecuentes
Preguntas comunes sobre la concrete yield calculator.
What is concrete yield?
The actual volume a batch produces: total mass of all ingredients divided by the fresh unit density. Expressed per ACI 138 / ASTM C138.
What is relative yield?
Actual yield ÷ design volume. 1.00 is perfect; below 0.98 the load is under-yielding (short); above 1.02 it's over-yielding (usually excess air or water).
Why did my pour come up short?
Common causes: under-yield at the plant, slab thickness running over (the usual culprit), uneven subgrade, or waste. Check thickness first, then run this yield check.
How do I measure fresh density?
ASTM C138 unit-weight test: weigh a known-volume container of consolidated fresh concrete and divide mass by volume.
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