Cement Calculator
Cement is the powder that binds concrete together. This estimates how many bags of cement a pour needs, based on the volume and how much cement the mix uses.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Mixes use a set amount of cement for each cubic metre. The default here, 335 kilograms, is close to the common mix of six 94 lb bags per cubic yard. Multiply the volume by that amount to get the total weight of cement.
A 94 lb bag holds about 42.6 kilograms. The total weight is divided by that and rounded up to a whole bag. A richer mix needs more cement, so use the figure from your own mix design when you have it.
Worked example
A pour of 1 yd³ of concrete needs 565 lb of cement in total. That is 7 bags of 94 lb cement.
Questions
Is cement the same as concrete?
No. Cement is the powder. Concrete is cement mixed with sand, gravel and water. Bags of ready-mix already contain all of them.
What if I use bags of ready-mix?
Ready-mix bags hold the cement, sand and gravel together, so use the Concrete Bag Calculator for those.
Where do I find the cement figure?
A mix design or your supplier can give the cement per cubic metre. If you have no figure, the default is a reasonable starting point.
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