Case 1
- Pour shape
- Rectangular slab
- Length (slab / footing)
- 3m
- Width (slab / footing)
- 2m
- Depth (slab / footing)
- 10cm
- Yield per bag (m³)
- 0.009m³
- Extra to order
- 0%
0.78 yd³ · 0.60 m³ · 67 bags
Open with these valuesConcrete Calculator
Change any value to update the result.
0.78 yd³ · 0.60 m³ · 67 bags
Concrete to order: 0.78 yd³ · 0.60 m³ · 67 bags- In other units
- 9.84 ft · 6.56 ft · 3.94 in
Examples
Choose a slab, rectangular footing or solid round column. Enter metric or US dimensions; volume is length × width × depth or π × radius² × height. Set any extra percentage yourself. The result shows order volume in cubic yards and metres plus whole bags at your chosen bag yield.
The numbers at a glance
Held fixed: Pour shape Rectangular slab, Length (slab / footing) 3.00 m, Width (slab / footing) 2.00 m, Depth (slab / footing) 10.00 cm, Yield per bag (m³) 0.0090 m³.
| Extra to order (%) | Concrete to order |
|---|---|
| 0.0Your value | 0.78 yd³ · 0.60 m³ · 67 bags |
| 0.1 | 0.79 yd³ · 0.60 m³ · 67 bags · base volume 0.60 m³ |
| 0.2 | 0.79 yd³ · 0.60 m³ · 67 bags · base volume 0.60 m³ |
| 0.3 | 0.79 yd³ · 0.60 m³ · 67 bags · base volume 0.60 m³ |
| 0.4 | 0.79 yd³ · 0.60 m³ · 67 bags · base volume 0.60 m³ |
| 0.5 | 0.79 yd³ · 0.60 m³ · 67 bags · base volume 0.60 m³ |
Worked examples
Case 2
- Pour shape
- Rectangular slab
- Length (slab / footing)
- 3.048m
- Width (slab / footing)
- 3.048m
- Depth (slab / footing)
- 10.16cm
- Yield per bag (m³)
- 0.017m³
- Extra to order
- 0%
1.23 yd³ · 0.94 m³ · 56 bags
Open with these valuesCase 3
- Pour shape
- Solid round column
- Diameter (solid column)
- 20.32cm
- Height (solid column)
- 1.2192m
- Yield per bag (m³)
- 0.017m³
- Extra to order
- 0%
0.05 yd³ · 0.04 m³ · 3 bags
Open with these valuesHow it's calculated
base m³ = L × W × D or π × (diameter/2)² × H; order m³ = base × (1 + extra/100); bags = ⌈order m³ / yield⌉
- StepChoose a slab, rectangular footing or solid round column and switch to feet/inches if needed.
- StepEnter rectangle dimensions or column diameter and height; only the selected shape is calculated.Diameter (solid column)=20.32cm·Height (solid column)=1.22m·Pour shape=Rectangular slab
- StepEnter the yield printed on your mix bag in m³; 0.017 m³ approximates an 80 lb QUIKRETE Concrete Mix bag.Yield per bag (m³)=0.009m³
- StepSet any extra percentage explicitly; zero keeps the measured base volume.Extra to order=0%
- ResultRead order volume in yd³ and m³ and the whole-bag count; check structural design separately.Extra to order=0%→0.78 yd³ · 0.60 m³ · 67 bags
What this number means
Base volume and order volume differ
The geometric volume assumes the measured shape. Uneven ground and handling can increase the order, so choose an allowance explicitly; zero adds nothing. The result keeps the base volume visible when you add extra.
Bags are bought whole
A 3 × 2 m slab at 10 cm holds 0.6 m³, or 66.7 bags at 0.009 m³ each. The formula rounds that up to 67. Bag yields vary with product and size; enter the figure on your packaging.
Compare bagged mix and ready-mix
For a large pour, compare a supplier quote for ready-mix with the bag count. This tool estimates quantity only; it does not choose a concrete specification or certify a footing or column design.
Commonly misread
MisconceptionThe measured base is 0.6 m³, so the order must be exactly 0.6 m³.
CorrectionThat is the ideal geometric volume. Choose any extra for uneven ground or handling in the allowance field; the added amount is shown separately from the base.
MisconceptionI entered the depth in metres while the input showed centimetres.
CorrectionThe unit is shown beside each field. In metric mode enter 10 for 10 cm; in US mode enter the depth or diameter in inches.
MisconceptionEvery bag yields the 0.009 m³ the calculator starts with.
CorrectionYield follows the bag size and the mix, and it is printed on the bag. The data sheet behind this calculator puts a 27.2 kg bag at 12.7 litres and a 36.2 kg bag at 17 litres.
Reference table
| Shape and measurements | Base volume | Bags, 0% extra |
|---|---|---|
| Slab 3 m × 2 m × 10 cm; 0.009 m³/bag | 0.60 m³ / 0.78 yd³ | 67 |
| Slab 10 ft × 10 ft × 4 in; 80 lb bag | 0.94 m³ / 1.23 yd³ | 56 |
| Column Ø 8 in × 4 ft; 80 lb bag | 0.04 m³ / 0.05 yd³ | 3 |
Questions
How much concrete do I need?
Choose a rectangular slab/footing or a solid round column. The result shows base or adjusted order volume in m³ and yd³ plus whole bags based on the yield entered. A 3 × 2 m slab at 10 cm is 0.6 m³ and 67 bags at 0.009 m³ each.
How thick should a concrete slab be?
Required thickness or footing size depends on the load, ground and local requirements. Enter the dimensions from your project plan; a quantity calculation does not establish that a slab or foundation is structurally adequate.
What bag yield should I enter?
The 0.009 m³ default is an approximate small-bag yield. QUIKRETE lists about 0.0085 m³ for 40 lb, 0.0127 m³ for 60 lb and 0.017 m³ for 80 lb Concrete Mix. Use your bag's stated mixed yield; changing it changes only the bag count, not the pour volume.
Should I use bags or ready-mix?
Compare quantities and supplier quotes for the mix you need. This calculator estimates volume and bag count; it does not price delivery or decide whether a product meets structural requirements.
Should I order a little extra?
Set the extra percentage yourself. Zero leaves the geometric base unchanged; a positive value increases the order volume before the bag count is rounded up. The base volume remains visible beside the order result.