A
Geometry & Dimensions
Add sections by dimensions, or enter volume directly.
B
Mix Design
Select a standard structural mix or define your own ratio.
- PAV1 / C30 — 1:2:3 Heavy-duty slabs, outdoor pathways
- PAV2 / C35 — 1:1.5:2.5 Heavy structural, walls, footings
- General Purpose — 1:2:4 Standard sheds, paths
- All-in Ballast (GP) — 1:5 Drives, paths — most common ballast mix
- All-in Ballast (Strong) — 1:4 Heavy structural, footings, bases
- Standard Mortar — 1:4 Sharp Sand Bedding, paving slab installation
- Custom Mix Define your own parts ratio
📐 1:2:3 — Heavy-duty slabs, outdoor pathways
C
Merchant & Packaging
Sets the small bag weight used in buying strategy calculations.
25 kg (Standard)
- Wickes Major Bag 22.5 kg — sand, gravel, ballast
- B&Q Large Bag 20.0 kg — sand, gravel, ballast
- Standard Handy Bag 25.0 kg — generic
850 kg (Jumbo / IBC)
D
Additives & Modifiers
Optional. Adjusts output instructions and water ratios.
Enter dimensions and hit Calculate Materials
Results show raw weights, all buying strategies, and a per-batch mixer recipe.