Count the 25 kg bags you need.
⚙️Calculation Parameters
📊Calculated Output
How 25 kg Concrete Bag Calculator Works?
To count 25 kg bags, the 25 kg Concrete Bag Calculator divides the form volume by 0.011 cubic meters (m³), the yield of one 25 kg bag. The process takes 4 steps.
Enter the form size
Type diameter in centimeters (cm) and depth in meters (m).
Calculate m³
The calculator finds the fill volume in m³ and liters (L).
Divide by 0.011 m³
One 25 kg bag yields about 11 L (0.39 ft³).
Read the order
The tool shows bags, tonnes of dry mix and the water to stage.
25 kg Concrete Bag Calculator Formula
The 25 kg Concrete Bag Calculator uses an 11 L yield.
Bag count
Bags = ⌈V (L) ÷ 11⌉V in liters.
Bags per m³
1,000 ÷ 11 ≈ 91 bagsAbout 2,273 kg of dry mix per m³.
Water per bag
≈ 2.0 L to 2.5 LFollow the product label.
Worked example: 4 deck piers in 30 cm × 1.2 m forms
- V = 4 × 0.0848 = 0.3393 m³ (339 L)
- Bags = ⌈339 ÷ 11⌉ = 31 bags
- Dry weight = 775 kg (0.78 t)
25 kg Concrete Bag Calculator Conversion Table
The 25 kg bag conversion table lists the form height 1 bag fills and bag counts at 1.0 m and 1.2 m depths.
| Form diameter | Height per bag | Bags at 1.0 m | Bags at 1.2 m | Bags at 1.2 m + 10% |
|---|---|---|---|---|
| 15 cm (5.9 in) | 62.2 cm | 2 | 2 | 3 |
| 20 cm (7.9 in) | 35.0 cm | 3 | 4 | 4 |
| 25 cm (9.8 in) | 22.4 cm | 5 | 6 | 6 |
| 30 cm (11.8 in) | 15.6 cm | 7 | 8 | 9 |
| 40 cm (15.7 in) | 8.8 cm | 12 | 14 | 16 |
| 45 cm (17.7 in) | 6.9 cm | 15 | 18 | 20 |
Yield is about 11 L per 25 kg bag. Brands vary between 10 L and 12 L.
What is 25 kg Concrete Bag Calculator?
A 25 kg Concrete Bag Calculator is a metric bag counter set to the 11 L (0.011 m³) yield of a 25 kg bag of concrete mix.
The 25 kg bag is the standard size for bagged cement products in the United Kingdom (UK), the European Union (EU), India and many other markets. Many health and safety guides use 25 kg as the upper single-person lift for frequent handling. A 30 cm form rises 15.6 cm per bag.
The calculator gives the bag count, the tonnes of dry mix for delivery planning and the water for each batch.
What are the uses of 25 kg Concrete Bag Calculator?
There are 4 main uses of the 25 kg Concrete Bag Calculator.
Metric deck piers
Builders count bags for 25 cm to 40 cm round piers.
Builder merchant orders
Buyers order bags by the pallet or loose.
Delivery weight
Users convert the count into tonnes for the delivery vehicle.
Site safety
Supervisors keep lifts at the 25 kg guideline.
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