Count the bags you need from the bag yield.
⚙️Calculation Parameters
📊Calculated Output
How Sonotube Bag Count Calculator Works?
To count bags, the Sonotube Bag Count Calculator divides the tube volume by the yield of each standard bag size and rounds up. The process takes 4 steps.
Enter tube size and count
Type the diameter, depth and number of tubes.
Calculate total volume
The calculator finds the fill in cubic feet (ft³) and adds the waste margin.
Divide by every bag yield
The tool divides the volume by 4 standard yields: 0.30 ft³ (40 lb), 0.375 ft³ (50 lb), 0.45 ft³ (60 lb) and 0.60 ft³ (80 lb).
Compare the counts
All 4 counts show side by side with the total weight to carry, so you can pick the bag size that suits the crew and the vehicle.
Sonotube Bag Count Calculator Formula
The Sonotube Bag Count Calculator applies one division per bag size.
Bag count
Bags = ⌈V ÷ Y⌉V is volume in ft³ and Y is the bag yield in ft³.
Standard yields
Y = 0.30 | 0.375 | 0.45 | 0.60 ft³For 40, 50, 60 and 80 lb premixed concrete.
Carry weight
W = Bags × bag weightTotal pounds (lb) to lift and haul.
Worked example: one 10 in × 48 in tube (2.18 ft³)
- 80 lb: ⌈2.18 ÷ 0.60⌉ = 4 bags (320 lb)
- 60 lb: ⌈2.18 ÷ 0.45⌉ = 5 bags (300 lb)
- 50 lb: ⌈2.18 ÷ 0.375⌉ = 6 bags; 40 lb: ⌈2.18 ÷ 0.30⌉ = 8 bags
Sonotube Bag Count Calculator Conversion Table
The bag count conversion table compares 4 bag sizes for 4 common tubes at 48 in (122 cm) deep, with no waste added.
| Tube | ft³ | 40 lb bags | 50 lb bags | 60 lb bags | 80 lb bags |
|---|---|---|---|---|---|
| 8 in × 48 in | 1.40 | 5 | 4 | 4 | 3 |
| 10 in × 48 in | 2.18 | 8 | 6 | 5 | 4 |
| 12 in × 48 in | 3.14 | 11 | 9 | 7 | 6 |
| 16 in × 48 in | 5.59 | 19 | 15 | 13 | 10 |
Smaller bags weigh less each but add bags, trips and mixing time.
What is Sonotube Bag Count Calculator?
A Sonotube Bag Count Calculator is a premixed concrete tool that converts round form volume into a whole number of bags for each standard bag size.
Stores sell the same concrete in 40 lb, 50 lb, 60 lb and 80 lb sizes. Bigger bags cost less per cubic foot, and smaller bags are easier to lift. A 12 in × 48 in pier takes 6 bags of 80 lb mix (480 lb) or 11 bags of 40 lb mix (440 lb). The calculator puts the options next to each other.
Every count rounds up, since a partial bag cannot be bought.
What are the uses of Sonotube Bag Count Calculator?
There are 4 main uses of the Sonotube Bag Count Calculator.
Shopping lists
Buyers get a bag count before driving to the store.
Bag size choice
Crews pick lighter bags for solo work or heavier bags to cut cost.
Vehicle loads
Owners check the total weight against truck or trailer payload.
Labor planning
Supervisors size the crew to the number of bags to mix.
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