Cement Calculator
Work out how many cement bags you need for a concrete or mortar mix from its wet volume and ratio.
Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.
Calculating...
Result
Fill in the form and click Calculate to see your result here.
How it's calculated
Dry volume = Wet Volume × Dry Volume Factor (typically 1.54). Each material's volume is its share of the mix ratio applied to the dry volume, and cement bags = Cement Weight ÷ 50kg.
Example
Example: Cement Calculator
Inputs
- Wet Volume: 1
- Cement Ratio: 1
- Sand Ratio: 2
- Aggregate Ratio: 4
- Dry Volume Factor: 1.54
Outputs
- Cement Bags: 7
- Cement Weight: 316.8
- Sand Volume: 0.44
- Aggregate Volume: 0.88
This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.
About this calculator
The Cement Calculator converts a wet concrete or mortar volume into the number of 50kg cement bags required, based on your chosen mix ratio (cement:sand:aggregate). It also reports the corresponding sand and aggregate volumes so you can order all materials in one go.
Frequently Asked Questions
Dry, loose materials (cement, sand, aggregate) occupy more space than they do once mixed with water and compacted, so a dry volume factor of around 1.54 is applied to the wet volume before calculating material quantities.
Common ratios are 1:2:4 for general RCC work and 1:1.5:3 for higher-strength applications. Check your project's structural specification or local building code for the recommended ratio.
A standard cement bag weighs 50kg, which is the figure this calculator uses to convert cement weight into the number of bags to order.
Related Calculators
In this category
Construction CalculatorsFeedback
Was this calculator helpful? Tell us in a sentence.