Kostenloser Zementrechner
Berechnen Sie Zement, Sand und Zuschlag für eine Mischung vor Ort aus Volumen und Mischungsverhältnis. Kostenlos, schnell und vollständig im Browser, ohne Anmeldung.
Aktualisiert am
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.
Häufig gestellte Fragen
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.