See how many mixer loads you need.
⚙️Calculation Parameters
📊Calculated Output
How Mixer Batch Count Calculator Works?
To count batches, the Mixer Batch Count Calculator divides the job volume by the usable mixed concrete per batch you enter. The process takes 4 steps.
Enter job volume
Type tube sizes and counts, or a volume in cubic feet (ft³).
Enter usable capacity
Type the mixed volume per batch, or the bags per batch. Usable capacity is less than drum size.
Divide and round up
The calculator divides and rounds up to whole batches.
Read time
Enter minutes per batch to see total mixing time.
Mixer Batch Count Calculator Formula
The Mixer Batch Count Calculator uses usable capacity.
Batches
N = ⌈V ÷ C_usable⌉C_usable in ft³.
From bags
C_usable = bags per batch × Y2 × 80 lb = 1.20 ft³.
Mixing time
T = N × t_batcht_batch is load, mix and dump time.
Worked example: 8 piers at 12 in × 48 in + 10%, 3.5 ft³ drum with 2 × 80 lb per batch
- V = 27.65 ft³
- N = ⌈27.65 ÷ 1.20⌉ = 24 batches
- At 8 minutes per batch: 192 min (3.2 h)
Mixer Batch Count Calculator Conversion Table
The batch count conversion table lists batches and mixing time for 8 piers at 12 in × 48 in with 10% waste (27.6 ft³, 0.78 m³) at 8 minutes per batch.
| Mixer setup | Usable ft³ | Batches | Mixing time |
|---|---|---|---|
| Wheelbarrow, 1 × 80 lb | 0.60 | 47 | 6.3 h |
| 3.5 ft³ drum, 2 × 60 lb | 0.90 | 31 | 4.1 h |
| 3.5 ft³ drum, 2 × 80 lb | 1.20 | 24 | 3.2 h |
| 6 ft³ drum, 3 × 80 lb | 1.80 | 16 | 2.1 h |
| 9 ft³ drum, 5 × 80 lb | 3.00 | 10 | 1.3 h |
Do not overfill a drum. Most drums mix well at about one-third to one-half of nominal volume.
What is Mixer Batch Count Calculator?
A Mixer Batch Count Calculator is a planning tool that counts mixer loads from the job volume and the usable mixed capacity of the mixer.
A mixer rated at 3.5 ft³ holds that much dry and wet material in motion, not that much finished concrete. Most mix 2 bags of 80 lb, or 1.20 ft³ of concrete, per batch. The calculator uses the usable figure, so the batch count matches the work.
Batch count drives crew time and rental time. The calculator shows both.
What are the uses of Mixer Batch Count Calculator?
There are 4 main uses of the Mixer Batch Count Calculator.
Mixer rental
Owners pick a drum size for a 1-day rental.
Crew planning
Supervisors assign mixer and wheelbarrow roles.
Pour timing
Crews plan batches to finish each pier without delay.
Labor estimates
Estimators convert batches into hours.
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