Calculators · Dirt & site work

Footings & piers calculator

Concrete for round piers — deck footings, post bases, sonotubes.

How it is worked out

π × (diameter ÷ 2)² × depth × count = cubic feet

What it assumes

Depth is to the BOTTOM of the hole — below your frost line, which is local.
Bags figured at 80 lb, 0.60 ft³ each; ready-mix rarely delivers this small.

This is the same calculator that is in your Hub

Nothing on this page is a demo of the real thing — it runs the identical code. What a TradeForge account adds is everywhere the number then goes: saved against the job it belongs to, dropped straight onto a quote, and priced at a rate built from your own overhead instead of a guess.

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