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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.

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 (defaults to 1000 - the green dot top left of 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 (cross) 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.

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

Max Length Start Left
Max Width Start Top Trim
Clear Textbox Each Entry Clear Side Length each entry. Use WASD keys up, left, down, right
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).

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

Print Tickets Need to print numbered tickets? Design Tickets Free Online and Print on your Printer! Easy Step by Step Instructions. No Limits.

Use your iPad or Android Tablet On-Site Your iPad or Android Tablet is a valuable On-Site tool! Print Diagrams Printing to Scale Help

Lay your tablet on an angle to directly measure angles and automatically enter them into Roofing and Pitch Angle Calculator Apps.

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

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

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