Work out grid levelling volume instantly with clear inputs, formula shown and shareable results.
In the grid or borrow pit method, each spot level contributes according to how many squares share it: corner points once, edge points twice, interior points four times. Volume is a quarter of the grid area times the weighted sum of depths, which is simply the average depth over the whole area expressed efficiently.
Grid volume
V = (grid area / 4) x (sum h1 + 2 sum h2 + 4 sum h4)
V = (grid area / 4) x (sum h1 + 2 sum h2 + 4 sum h4). In the grid or borrow pit method, each spot level contributes according to how many squares share it: corner points once, edge points twice, interior points four times.
Yes. A coarse grid misses local highs and hollows. Grid spacing should be close enough that the ground can be treated as planar within each square, typically 10 to 20 metres on open sites.
This calculator takes 4 inputs: Grid square side, Sum of depths used once, Sum of depths used twice, Sum of depths used four times. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.