Calculadora de Cemento Gratis
Calcula cemento, arena y árido para una mezcla hecha en obra a partir del volumen y la proporción de mezcla. Gratis, rápido y funciona por completo en tu navegador sin necesidad de registro.
Actualizado
Cement, sand and aggregate
Cement needed
8
94 lb bags
- Finished volume
- 33.3cubic feet
- Dry volume required
- 51.3cubic feet
- Sand
- 14.7cubic feet
- Aggregate
- 29.3cubic feet
How this is calculated
dry volume = finished volume × 1.54; each material = dry volume × its share of the mix ratio
- The 1.54 factor converts finished (wet) volume to the dry material needed — voids close up as the mix is compacted.
- A 94 lb bag of Portland cement measures roughly 1 ft³ loose.
- Use this for mixing on site. For a pre-mixed bagged product, the concrete calculator gives bag counts directly.
- Water is not included; follow the water-cement ratio on the bag.
Preguntas Frecuentes
How does the Cement Calculator work?
It applies the formula dry volume = finished volume × 1.54; each material = dry volume × its share of the mix ratio. Enter your measurements and the result updates instantly in your browser — nothing is uploaded and no sign-up is needed.
Why should I include a waste allowance?
Offcuts, spillage, breakage and an uneven sub-base all consume material that the raw geometry does not account for. The default allowance is deliberately modest; increase it for complex layouts, and remember that running short usually costs more in a second delivery than the surplus did.
Are the results exact?
They are a close estimate, not a guarantee. undefined Real materials vary by supplier, moisture content and compaction, so confirm the rate with your supplier before placing a large order.
Is this tool free?
Yes, completely free with no registration. All calculations happen client-side in your browser.
Does it work on mobile?
Yes. The calculator is fully responsive and works on phones and tablets in any modern browser — useful when you are measuring on site.
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About the Cement Calculator
The Cement Calculator splits a pour volume into cement, sand and aggregate at your chosen mix ratio, applying the dry-volume factor that mixing on site requires. Enter your measurements and the result updates as you type — there is nothing to submit and nothing to wait for.
Everything runs in your browser. Nothing you enter is sent to a server, there is no sign-up, and there is no usage limit.
Who it's for
Anyone batching concrete by hand rather than buying it pre-mixed.
How the calculation works
dry volume = finished volume × 1.54; each material = dry volume × its share of the mix ratio
The result depends on a few standard constants, which are stated on the page rather than hidden:
Getting an accurate estimate
Measure twice. Small errors in a linear dimension compound, because material volume scales with two or three of them at once — a 6-inch error across a 20-foot run is over a cubic foot of material on a 4-inch pour.
Keep the waste allowance. The default is deliberately conservative: offcuts, spillage, uneven sub-base and breakage are all real, and running short mid-job usually costs more in a second delivery than the surplus did.
Round up when you order. Suppliers sell in fixed increments — quarter yards, whole bags, full boxes — so treat the figure here as the minimum you need rather than the exact amount to buy.