Concrete Bag Calculator

Convert a required concrete volume into whole bags using the yield printed on your mix.

Result

You need 34 bags of concrete mix.

Based on: 0.6 ft³ yield per bag

Calculated bags before roundingest.: 33.8bags
Concrete required: 20.3ft³

Bag yield varies by product. The bag label is authoritative.

How the concrete bag calculator works

Bag count is volume divided by yield per bag, rounded up to a whole bag. The required volume should come from the concrete calculator or the project drawings.

Bag weight is not yield. Two mixes with the same bag weight can publish different mixed volumes, so the product label is the number that belongs in the yield field.

Formula used for concrete bag calculator

The calculator keeps the measured quantity separate from any purchase rounding or allowance.

Normalize volumerequired cubic feet = cubic yards × 27
Bagsbags = required cubic feet ÷ yield per bag, rounded up

Planning choices for concrete bag calculator

Situation	Use	Why it matters
Small repair or post holes	Bagged mix	Practical for limited volumes
Larger continuous pour	Compare ready-mix	Bag count and mixing time rise quickly
Product changed	Replace yield	Yield belongs to the exact mix

These are measurement and ordering choices, not structural specifications or code requirements.

Measure and order concrete bag

Calculate every hole or shape before adding the volumes. Use the yield from the current bag, not a remembered figure from another brand.

Round up only after dividing the total volume by yield. Rounding each shape separately can overstate a multi-part order.

Concrete Bag Calculator questions

Is an 80 lb bag always 0.6 cubic foot?
No. Treat that only as a starting figure and use the yield printed by the manufacturer.
Does water added change the yield?
Mixing outside the product instructions can change performance and usable volume; follow the label.
When should I order ready-mix?
Compare the total bag count, labour, batch consistency, access and supplier minimums rather than using a universal cutoff.

Variables and units

For the default “Required concrete volume” mode. Other modes label their own fields in the calculator.

volume: Concrete required: yd³, ft³, m³.
yield: Yield per bag: ft³.

Worked example: 0.6 cubic yard using 0.6 ft³ bags

A small pour requires 0.6 cubic yard and the selected bag states a yield of 0.6 cubic foot.

What goes in
Field	Value
Concrete required	0.6 yd³
Yield per bag	0.6 ft³

What comes out
Result	Value
Whole bags to buy	27 bags
Calculated bags before rounding	27 bags
Concrete required	16.2 ft³

These figures are generated by the same calculation the calculator above uses, so they update automatically if the method changes.

Where these numbers come from

Draft: not yet published or indexed

Assumption	Value used	Status
Yield of an 80 lb bag of concrete mix.Bag yield differs between products. Read the yield printed on the bag you are actually buying and enter it here. Applicability: Launch-market starting value only. A future market must supply reviewed regional or product-specific provenance before overriding it. You can replace this with your own figure.	0.6 ft³	Not yet verified

This figure is a working placeholder. It has not yet been checked against the source listed, so treat it as indicative and confirm with your supplier.

Sources

Manufacturer published bag yield (product data sheets): Individual bagged-concrete manufacturers Not yet checked

Published by Material Totals. Review the calculation methodology and source registry.

Suggested citation: Material Totals, “Concrete Bag Calculator,” https://materialtotals.com/concrete-bag-calculator/