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One cubic yard needs 45 bags of 80 lb concrete, 60 bags of 60 lb, or 90 bags of 40 lb. Enter any volume in the free concrete bag calculator below and it converts to exact bag counts for all three common bag sizes.

How to use the concrete bag calculator

1. Enter the concrete volume in cubic yards.
2. Read the bag counts for 80, 60 and 40 lb bags.
3. Round up: buy one or two spare bags for touch-ups.
4. Check the coverage note: it shows the cubic feet behind the count.

Formula

Bags = volume ÷ bag yield. Yields: 80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45 ft³, 40 lb ≈ 0.30 ft³.

Practical tips

• Bag yields are approximate: allow 5 percent extra on big counts.
• Above 1 cubic yard (45 bags of 80 lb), ready-mix is usually cheaper per yard.
• Store bags dry and off the ground: damp cement sets in the bag.
• Mix no more than you can place in 90 minutes.

Frequently asked questions

How many 80 lb bags in a yard?

45 bags of 80 lb concrete make one cubic yard.

How many 60 lb bags in a yard?

60 bags of 60 lb concrete make one cubic yard.

Bags or ready-mix: which is cheaper?

Bags win under about 1 cubic yard. Above that, a ready-mix truck is cheaper and far less labour.

Working from measurements instead? Use the slab calculator or the full hub.

Worked examples

Example 1: 1 cubic yard. 45 x 80 lb bags, 60 x 60 lb bags, or 90 x 40 lb bags.

Example 2: 2.5 cubic yards. 113 x 80 lb bags, 150 x 60 lb bags, or 225 x 40 lb bags.

Bag count reference table

No waste included. Add 10% for spillage.

Volume	80 lb	60 lb	40 lb
0.5 yd3	23	30	45
1 yd3	45	60	90
2 yd3	90	120	180
3 yd3	135	180	270
5 yd3	225	300	450

More bag questions

How many 80 lb bags in a cubic yard?

45. Each 80 lb bag yields about 0.60 cubic feet, and 27 / 0.60 = 45.

How many 25 kg bags per cubic metre (UK)?

About 86. Each 25 kg bag yields roughly 0.0117 m3.