Spike's Calculators

Self Mix Concrete Calculator - Metric

Calculate the materials, including the amount of water needed, from a mixture ratio for on-site mixing of concrete. Calculator uses Metric measurements and calculates the amount of concrete needed for pouring a slab.

Mixing Ratio Cement #    Sand #    Gravel #
Cement/Water Ratio #
Length of Slab m
Width of Slab m
Depth of Slab mm


Volume of Concrete Needed
Volume and Weight of Cement m³    kg
Volume and Weight of Sand m³    kg
Volume and Weight of Gravel m³    kg
m³    kg    litres
Total Weight kg

The Calculation

  1. enter your mix ratio's
  2. cement to water ratio
  3. length of slab (metres)
  4. width of slab (metres)
  5. depth of slab (millimetres)


  1. volume of concrete needed in cubic metres
  2. cement volume and weight (cubic metres and kilograms)
  3. volume and weight of the fine aggregate (cubic metres and kilograms)
  4. volume and weight of the course aggregate (cubic metres and kilograms)
  5. water in litres and kilograms
  6. total weight of concrete mix in kilograms

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