How to use it
- Enter the area in square metres and the desired thickness in millimetres.
- Set the cement and sand parts of the mix ratio and the waste factor percentage.
- Provide the weight of one cement bag if it differs from the default.
- Read the four results: volume, cement kg, sand kg, and bags required.
The Ready Mix Mortar Calculator turns the size of a wall, floor or patch into the exact amount of mortar you need, expressed in cubic metres, kilograms of cement, kilograms of sand, and the number of cement bags. You enter the area, thickness, and the mix ratio; the tool applies the standard densities (cement 1440 kg/m³, sand 1600 kg/m³) and adds the waste factor you specify. The result tells you how much material to order, preventing shortages and over‑ordering. Read the volume to size your mixer, the cement and sand weights to check delivery limits, and the bag count to know how many 50 kg bags to buy. All calculations happen instantly in your browser, so you can adjust inputs on the fly. You can also compare different mix ratios to find the most cost‑effective mix for your project.
Pro tips
- Add a 5‑10% waste factor for typical site losses.
- Round cement bags up to the next whole bag to avoid shortfalls.
- Order sand in bulk only if the total weight exceeds truck capacity.
- Double‑check the mix ratio before submitting to avoid costly errors.
Real-life examples
- A homeowner estimating mortar for a new patio slab.
- A contractor planning bricklaying for a commercial façade.
- A mason ordering materials for a repair of a historic wall.
Case study
John, a small‑contractor, entered a 45 m² wall at 12 mm thickness with a 1:5 mix and 10 % waste. The calculator showed 0.54 m³ mortar, 777 kg cement (6 bags), and 864 kg sand, letting him order exactly the right quantities and finish on schedule.