Concrete Bag Calculator
Enter the size of your pour and get the bags to buy for each bag size, using the maker's yield for each one, with the working shown. A slab that is not a rectangle can be drawn with Draw a shape.
Estimates for planning, not professional advice. Read the full notice.
Shape
The drawing did not open. Length and width are still here.
Slab: shape and size
Skip the drawingDrag a round corner to move it. The small hollow diamond on a side is its curve handle: drag it across the side to curve the side (it is not a corner). To add a corner (a new point), tap the side itself, then choose Add a point here. Tapping a corner or a side opens its actions. Drag empty space to move the view; pinch, or Ctrl and the mouse wheel, to zoom. The keys are listed under Keys.
Keys
- Tab
- next corner; each says how far it is from corner 1
- Arrow keys on a corner
- move it one square; ten with Shift; 1/16 in with Alt
- Delete or Backspace
- remove the corner; its two sides join in one straight side
- + on a corner
- add a corner halfway along the next side
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- move the view; farther with Shift
- + and - on the drawing
- zoom in and out
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- show the whole shape
- Ctrl+Z (Cmd+Z on a Mac)
- undo, except inside a typed field (it keeps its own)
- Ctrl+Shift+Z or Ctrl+Y
- redo
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- put it back where it was
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- go to its actions
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- Area
- 115.63 ft²
- Perimeter
- 43 ft 6 in
- Cut-out edges
No area until the shape is fixed.
Estimate for planning, from what you entered and the product data shown. Check product labels and your supplier before you buy.
Shape: Rectangle Change
Sides
Corners
Cut-outs
Feet and inches, like 12' 6"
Product names are trademarks of their owners. HoneyDoMath is not affiliated with, sponsored by or endorsed by these makers. Figures come from each maker's published sheets and are shown for information only.
Example: a patio slab
71 80 lb bags
- Concrete in the slab 38.54 ft³
- To mix, with waste 42.4 ft³
- In 40 lb bags 142 × 40 lb bags
- In 50 lb bags 114 × 50 lb bags
- In 60 lb bags 95 × 60 lb bags
Your project
Enter a size to see your total.
Each product is rounded up once for the whole project, so the total can be less than the items bought alone added together. A line counted from a cut layout (sheets, boards or tiles laid out piece by piece) is counted for each item and added.
Shopping list
| Item | Size | Buy |
|---|---|---|
| Concrete mix | 80 lb bag | 71 |
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Saved projects
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Worked example: a patio slab
Assumptions
The figures behind the example. Sourced figures link to their source below; a default is a starting value to check against your label or supplier.
| Assumption | Value | Details and changes |
|---|---|---|
| Concrete waste allowance | 10%[1] | |
| Default 10% is the top of NRMCA's 4% to 10% range. | ||
| Yield of the 40 lb bag | approx. 0.3 ft³[2] | |
| A 40 lb bag of QUIKRETE Concrete Mix 1101 yields about this many cubic feet, as the maker's own sheet states. | ||
| Yield of the 50 lb bag | approx. 0.375 ft³[2] | |
| A 50 lb bag of QUIKRETE Concrete Mix 1101 yields about this many cubic feet, as the maker's own sheet states. | ||
| Yield of the 60 lb bag | approx. 0.45 ft³[2] | |
| A 60 lb bag of QUIKRETE Concrete Mix 1101 yields about this many cubic feet, as the maker's own sheet states. | ||
| Yield of the 80 lb bag | approx. 0.6 ft³[2] | |
| An 80 lb bag of QUIKRETE Concrete Mix 1101 yields about this many cubic feet, as the maker's own sheet states. | ||
| Yield of the 90 lb bag | approx. 0.675 ft³[2] | |
| A 90 lb bag of QUIKRETE Concrete Mix 1101 yields about this many cubic feet, as the maker's own sheet states. | ||
Feet and inches, like 12' 6"
Common jobs
Bags to buy for common jobs, by bag size
| Job (length × width × thickness) | Concrete with waste | 40 lb bags | 50 lb bags | 60 lb bags | 80 lb bags | 90 lb bags |
|---|---|---|---|---|---|---|
| 2 ft × 2 ft × 2 in | 0.73 ft³ | 3 × 40 lb bags | 2 × 50 lb bags | 2 × 60 lb bags | 2 × 80 lb bags | 2 × 90 lb bags |
| 10 ft × 10 ft × 4 in | 36.67 ft³ | 123 × 40 lb bags | 98 × 50 lb bags | 82 × 60 lb bags | 62 × 80 lb bags | 55 × 90 lb bags |
Each count includes the waste allowance in the assumptions above and is rounded up once, at the bag.
Yield per bag
What one bag of the maker's concrete mix yields, by bag size
| Bag size | Yield per bag |
|---|---|
| 40 lb | approx. 0.3 ft³ |
| 50 lb | approx. 0.375 ft³ |
| 60 lb | approx. 0.45 ft³ |
| 80 lb | approx. 0.6 ft³ |
| 90 lb | approx. 0.675 ft³ |
Figures in the Yield per bag column are per QUIKRETE's data sheet, checked Nov 12, 2026.
Product names are trademarks of their owners. HoneyDoMath is not affiliated with, sponsored by or endorsed by these makers. Figures come from each maker's published sheets and are shown for information only.
Source: [2]
Your bag's label comes first. If it says something different, use the label.
Yield per bag, by maker and mix
What one bag yields, for each concrete mix and bag size the calculator offers, as its maker states
| Mix and bag size | Yield per bag |
|---|---|
| QUIKRETE 5000 High Early Strength Concrete Mix, 50 lb | approx. 0.375 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE 5000 High Early Strength Concrete Mix, 60 lb | approx. 0.45 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE 5000 High Early Strength Concrete Mix, 80 lb | approx. 0.6 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Concrete Mix 1101, 40 lb | approx. 0.3 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Concrete Mix 1101, 50 lb | approx. 0.375 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Concrete Mix 1101, 60 lb | approx. 0.45 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Concrete Mix 1101, 80 lb | approx. 0.6 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Concrete Mix 1101, 90 lb | approx. 0.675 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Crack Resistant Concrete Mix, 50 lb | approx. 0.375 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Crack Resistant Concrete Mix, 60 lb | approx. 0.45 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Crack Resistant Concrete Mix, 80 lb | approx. 0.6 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Fast-Setting Concrete Mix 1004, 50 lb | approx. 0.375 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Fast-Setting Concrete Mix 1004, 60 lb | approx. 0.45 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Q•MAX PRO Concrete Mix, 50 lb | approx. 0.375 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| QUIKRETE Q•MAX PRO Concrete Mix, 80 lb | approx. 0.6 ft³ (per QUIKRETE's data sheet, checked Nov 12, 2026) |
| Rapid Set CONCRETE MIX, 60 lb | approx. 0.5 ft³ (per Rapid Set's published data, checked Nov 12, 2026) |
| SAKRETE 5000 Plus Concrete Mix, 50 lb | 0.38 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE 5000 Plus Concrete Mix, 60 lb | 0.47 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE 5000 Plus Concrete Mix, 80 lb | 0.6 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Crack-Resistant Concrete Mix, 50 lb | 0.38 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Crack-Resistant Concrete Mix, 80 lb | 0.6 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Fast Setting Concrete Mix, 50 lb | 0.38 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE High Strength Concrete Mix, 40 lb | 0.3 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE High Strength Concrete Mix, 60 lb | 0.45 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE High Strength Concrete Mix, 80 lb | 0.6 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE High Strength Concrete Mix, 90 lb | 0.66 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Maximizer Concrete Mix, 40 lb | 0.46 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Maximizer Concrete Mix, 80 lb | 0.92 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
| SAKRETE Pro-Mix Advanced Concrete Mix, 50 lb | 0.375 ft³ (per SAKRETE's data sheet, checked Nov 12, 2026) |
Product names are trademarks of their owners. HoneyDoMath is not affiliated with, sponsored by or endorsed by these makers. Figures come from each maker's published sheets and are shown for information only.
Sources: [3][2][4][5][6][7][8][9][10][11][12][13]
The list is in alphabetical order by maker, then by mix. Your bag's label comes first. If it says something different, use the label.
Questions
How many bags of concrete do I need?
Find the volume of your pour, add a waste allowance, divide by the yield on your bag's label and round up once, at the bag. The calculator does this for each bag size and shows every step.
How many 80 lb bags of concrete do I need for a 10x10 slab?
The Common jobs table on this page shows a slab of that size in every bag size, with the waste allowance added and the count rounded up once.
Why round up only once?
Rounding each part of a job first can add or drop a bag. The calculator adds the exact volumes, puts the waste allowance on the total, and rounds up once, at the bag.
Where do the bag yields come from?
From the bag maker's own data sheet, listed under Sources with the date it was checked. Other mixes and other makers can yield differently, so read your own bag's label.
How much extra should I order?
The National Ready Mixed Concrete Association says to order a little more than the estimate worked out from the plan dimensions, to cover contingencies. The allowance here is a starting value you can change.
Sources (13)
-
CIP 31, Ordering Ready Mixed Concrete (opens in new tab), National Ready Mixed Concrete Association, 2000, 2016, 2023.
Standards or industry body.
“Quantity of concrete ordered should be 4% to 10% more than an estimate calculated from the plan dimensions to account for contingencies.”
Checked November 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 1) -
QUIKRETE Concrete Mix No. 1101 data sheet (opens in new tab), The Quikrete Companies, Revised October 2022.
Manufacturer data.
“An 80 lb (36.2 kg) bag yields approximately 0.60 ft3 (17 L)”
“A 40 lb (18.1 kg) bag yields approximately 0.30 ft3 (8.5 L)”
“A 50 lb (22.6 kg) bag yields approximately 0.375 ft3 (10.6 L)”
“A 60 lb (27.2 kg) bag yields approximately 0.45 ft3 (12.7 L)”
“A 90 lb (40.8 kg) bag yields approximately 0.675 ft3 (19.1 L)”
Per QUIKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 2) -
QUIKRETE 5000 High Early Strength Concrete Mix No. 1007 data sheet (opens in new tab), The Quikrete Companies, Revised November 2022.
Manufacturer data.
“A 50 lb (22.6 kg) bag yields approximately 0.375 ft3 (10.6 L)”
“A 60 lb (27.2 kg) bag yields approximately 0.45 ft3 (12.7 L)”
“An 80 lb (36.2 kg) bag yields approximately 0.60 ft3 (17 L)”
Per QUIKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 3) -
QUIKRETE Crack Resistant Concrete Mix No. 1006 data sheet (opens in new tab), The Quikrete Companies, Revised December 2021.
Manufacturer data.
“A 50 lb (22.6 kg) bag yields approximately 0.375 ft3 (10.6 L)”
“A 60 lb (27.2 kg) bag yields approximately 0.45 ft3 (12.7 L)”
“An 80 lb (36.2 kg) bag yields approximately 0.60 ft3 (17 L)”
Per QUIKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 4) -
QUIKRETE Fast-Setting Concrete Mix No. 1004 data sheet (opens in new tab), The Quikrete Companies, Revised November 2025.
Manufacturer data.
“Each 50 lb (22.6 kg) bag yields approximately 0.375 cu ft (10.6 L)”
“Each 60 lb (27.2 kg) bag yields approximately 0.45 cu ft (12.7 L)”
Per QUIKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 5) -
QUIKRETE Q•MAX PRO Concrete Mix No. 1004-81 data sheet (opens in new tab), The Quikrete Companies, Revised April 2022.
Manufacturer data.
“A 50 lb (22.6 kg) bag and an 80 lb (36.2 kg) bag of QUIKRETE Q•MAX PRO Concrete Mix will yield approximately 0.375 ft3 (10.6 L) and 0.6 ft3 (16.9 L) respectively, at the recommended consistency.”
Per QUIKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 6) -
Rapid Set CONCRETE MIX datasheet DS_004_EN (opens in new tab), CTS Cement Manufacturing Corporation (Rapid Set), Datasheet DS_004_EN, web view, © 2026.
Manufacturer data.
“One 60-lb (27.2-kg) bag of CONCRETE MIX will yield approximately 0.5 ft3 (0.01 m3).”
Per Rapid Set's published data, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 7) -
SAKRETE 5000 Plus Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, Technical data sheet, 2023 (sakrete.com copy).
Manufacturer data.
“50 lb 0.38 ft3 2.1 qts”
“60 lb 0.47 ft3 2.5 qts”
“80 lb 0.6 ft3 3.5 qts”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 8) -
SAKRETE Crack-Resistant Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, Technical data sheet, no date read (sakrete.com copy).
Manufacturer data.
“50 lb 22.7 kg 0.38 ft3 0.01 m3”
“80 lb 36.3 kg 0.6 ft3 0.017 m3”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 9) -
SAKRETE Fast Setting Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, Rev. 05/18.
Manufacturer data.
“50 lb (22.6 kg) 0.38 ft3 (.01 m3) 2.5 to 3 qts (2.4 - 2.9 L)”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 10) -
SAKRETE High Strength Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, Technical data sheet, 2023 (sakrete.com copy).
Manufacturer data.
“40 lb 0.30 ft3 1.75 qts”
“60 lb 0.45 ft3 2.5 qts”
“80 lb 0.6 ft3 3.5 qts”
“90 lb 0.66 ft3 4.25 qts”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 11) -
SAKRETE Maximizer Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, File name dated 04-24 (sakrete.com copy).
Manufacturer data.
“40 lb 18.1 kg 0.46 ft3 0.013 m3”
“80 lb 36.3 kg 0.92 ft3 0.026 m3”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 12) -
SAKRETE Pro-Mix Advanced Concrete Mix technical data sheet (opens in new tab), SAKRETE of North America, Technical data sheet, no date read (sakrete.com copy).
Manufacturer data.
“50 lb 22.7 kg 0.375 ft3 0.01 m3”
Per SAKRETE's data sheet, checked Nov 12, 2026. Figures and codes change; verify with the source. Back to where this is used (Source 13)
These are summaries of what the sources say, not professional advice. Codes and product data change. Check with your building department and the product label about your own project.
Sources
- [1] National Ready Mixed Concrete Association, CIP 31, Ordering Ready Mixed Concrete. Checked November 12, 2026. https://www.nrmca.org/wp-content/uploads/2021/01/31pr.pdf
- [2] QUIKRETE, QUIKRETE Concrete Mix No. 1101 data sheet. Checked November 12, 2026. https://www.quikrete.com/PDFs/DATA_SHEET-Concrete%20Mix%201101.pdf
- [3] QUIKRETE, QUIKRETE 5000 High Early Strength Concrete Mix No. 1007 data sheet. Checked November 12, 2026. https://www.quikrete.com/PDFs/DATA_SHEET-QUIKRETE%205000%201007.pdf
- [4] QUIKRETE, QUIKRETE Crack Resistant Concrete Mix No. 1006 data sheet. Checked November 12, 2026. https://www.quikrete.com/PDFs/DATA_SHEET-Crack%20Resistant%20Concrete%20Mix%201006-80.pdf
- [5] QUIKRETE, QUIKRETE Fast-Setting Concrete Mix No. 1004 data sheet. Checked November 12, 2026. https://www.quikrete.com/PDFs/DATA_SHEET-Fast%20Setting%20Concrete%20Mix%201004-50.pdf
- [6] QUIKRETE, QUIKRETE Q•MAX PRO Concrete Mix No. 1004-81 data sheet. Checked November 12, 2026. https://www.quikrete.com/PDFs/DATA_SHEET-QMAX-PRO-1004-81.pdf
- [7] Rapid Set, Rapid Set CONCRETE MIX datasheet DS_004_EN. Checked November 12, 2026. https://www.ctscement.com/datasheet/CONCRETE_MIX_Datasheet_DS_004_EN
- [8] SAKRETE, SAKRETE 5000 Plus Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2021/07/Sakrete-5000-Plus-TDS.pdf
- [9] SAKRETE, SAKRETE Crack-Resistant Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2021/07/Sakrete-Crack-Resistant-Concrete-TDS.pdf
- [10] SAKRETE, SAKRETE Fast Setting Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2021/07/Fast-Setting-Concrete.pdf
- [11] SAKRETE, SAKRETE High Strength Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2024/01/Sakrete-High-Strength-Concrete-Mix-TDS.pdf
- [12] SAKRETE, SAKRETE Maximizer Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2024/09/Sakrete-Maximizer-Concrete-Mix-TDS-04-24.pdf
- [13] SAKRETE, SAKRETE Pro-Mix Advanced Concrete Mix technical data sheet. Checked November 12, 2026. https://www.sakrete.com/wp-content/uploads/2023/02/Pro-Mix-Advanced-Concrete-Mix-TDS-1.pdf