Cement Calculator

How to use Cement Calculator

1. Open Cement Calculator in your browser — it loads instantly and works offline once cached.
2. Enter your values in the input fields. Every field is labelled so you know exactly what to type.
3. The result updates automatically as you type — there is no "submit" round-trip to a server.
4. Adjust any input to compare scenarios and see how the outcome changes in real time.
5. Copy or note the result. Nothing you enter is stored or sent anywhere.

Why use Cement Calculator?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full construction suite, so related cement tasks are one click away.

What people use Cement Calculator for

• Working out cement, sand and aggregate quantities for a mix.
• Estimating materials for mortar or render.
• Costing the components of a small concrete job.

Cement Calculator: limits and things worth knowing

• Mix ratios are by volume: 1:2:4 is one part cement, two sand, four aggregate, a common general-purpose concrete of around 20 MPa.
• Dry volume exceeds wet volume by roughly 50-55% because the materials compact and voids fill, so ordering by finished volume alone leaves you short.
• Water-cement ratio governs strength far more than cement quantity. Adding water to improve workability weakens the result significantly.
• Mortar uses different ratios from concrete — typically 1:4 to 1:6 cement to sand depending on the application.

Is it private and secure?

Your privacy is built in. Cement Calculator runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Why Browser-Based Tools Are Safer for Your Files — Most online converters upload your files to a server. Client-side tools don't. Here's why that difference matters for privacy.