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Cement Calculator

Estimate cement bags from concrete or mortar volume and mix ratio (for example 1:2:4) with a wastage allowance.

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

Cement mass derived from mix parts × dry volume factor in the handler, then ÷ bag weight (typically 50 kg) with wastage.

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

Cement is bought in bags, not cubic metres. This calculator turns a mix ratio and a volume into bag counts so a pour or plastering day is not short one stack.

Dry volume is larger than wet (bulking). The handler uses its documented conversion — do not double-add your own 54% if the tool already did. Store bags off the monsoon floor; damaged bags are wastage twice.

Frequently Asked Questions

Wet volume (m³), mix parts (default 1:2:4 cement:sand:aggregate), and dry-volume factor (default 1.54). Bags use density 1,440 kg/m³ and 50 kg bag weight.
Wet concrete occupies less than dry ingredients (voids/bulking). 1.54 is a common site factor encoded as the default. Do not add another 54% on top if the field is already 1.54.
OPC in Nepal/India is typically 50 kg (BAG_WEIGHT_KG in the handler). Scale if you buy another pack size.
No. Enter wet volume from drawings or the concrete calculator first.
Set aggregate ratio to 0 and parts to your mortar ratio. Confirm dry factor with your engineer for plaster vs concrete.
It is the usual bulk density used in quantity surveying for this class of estimate, not a lab certificate.
Not a separate field here. Increase wet volume or bags after the result if monsoon storage is poor.
Translate the mix you were given into ratio parts. This tool does not look up IS grade tables by name.
Not computed. This is ingredient mass/bags from mix parts, not slump design.
RMC is ordered in wet m³. Use this when you site-mix and need bag counts.

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