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Concrete Volume Calculator
To use this calculator, first draw the shape of your concrete slab: Demo Click the green 'Demo' button to see how it works.

Measure Left click in diagram, hold button down and drag to measure dimensions and area at full scale.

1: Enter Max Length and Max Width of slab. (Add ~2000 to Length and Width to keep diagram in from edges)

2: Enter Start Top and Start Left, for starting point of diagram (the green dot in grid)

3: Hit Re-Set or Clear + Start and enter Side Length of first side to draw and hit appropriate direction (Arrow) button to draw first side. You can also use WASD → keyboard keys instead of arrow buttons. The Q key = Undo Last.

4: Repeat and continue to draw complete (closed) slab shape. DO NOT overlap sides.

5: When shape is complete, it will fill solid color. Enter Slab Thick, edge and internal thickenings if required, then click Calculate for results.

Max Length Start Left
Max Width Start Top
Clear Textbox Each Entry Clear Side Length each entry. Use WASD keys up, left, down, right Increase diagram size to best fit
Side Length

Do not overlap sides DO NOT overlap (cross) sides.
Slab Thick Internal Thickening Length
Edge Beam Width Internal Thickening Width
Edge Beam Thick Internal Thickening Thick


Keyboard entry To enter Side Lengths and draw diagram, enter length and use WASD → to draw the side. Hit Q to remove the last entered side, and C to close the diagram. You can enter multiple length sides in same direction, but cannot go back (against) the previous direction, cross or intersect any other side.

The current distance (X and Y) to start point is displayed below the Side Length entry. Draw a side at 1 of the lengths displayed to get back to a point horizontally or vertically so you can close the diagram. If the last drawn side end is in line with the start point (not diagonal), hit 'Close Diagram' to auto add the last side and close the diagram. Clicking the X or Y entry will enter its length into the Side Length box. You can then hit the Close Diagram button, or the C key to close the diagram.

Check 'Splay Internal Edges' to splay internal footing edges at 45° (see drawing). recommends Quality Builder - Gary White - All Areas Contact

Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

Open new window containing only diagram images in current page ↓ This will better fit printed page. Printing to Scale Help
Print all diagrams on current page

Use your iPad or Android Tablet On-Site Your iPad, iPhone or Android Tablet or Phone is a valuable On-Site tool!
Lay your phone or tablet on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

If you've benefited from this free service, please consider a small donation to
Blue Dragon Children's Foundation

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Greg Tarrant - ph: (Australia) +61 7 40987645 - mob: 0438 165 753

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