Concrete Calculators
Almost every concrete job comes down to one number — the volume, in cubic yards or cubic metres — and these calculators get it from the shape you are pouring. The Concrete Calculator covers a rectangular slab or footing; the Concrete Footing, Column, Pier and Stairs calculators handle those specific forms; the Sonotube Concrete Calculator does round tube forms and the Concrete Calculator for Fence Posts subtracts the posts from the hole volume. Two cost tools, the Concrete Cost Calculator and the Cement Calculator, turn a volume into a price or a site-mix bag count. Each one shows the formula, keeps the waste allowance visible and editable, and reports the exact quantity and the recommended order amount as two separate figures. Reinforcing steel and any gravel base are counted separately.
12 calculators · all live
All Concrete Calculators · 12
Concrete Calculator
How much concrete a rectangular slab or footing needs, in cubic yards or cubic metres.
Concrete Cost Calculator
Estimated material cost of a concrete pour from its volume and a unit price.
Concrete Block Calculator
Number of concrete masonry units (blocks) for a wall of a given area.
Concrete Block Fill Calculator
Grout volume needed to fill the cores of a concrete block wall.
Concrete Calculator for Fence Posts
Concrete volume to set a run of fence posts, allowing for the posts displacing concrete in each hole.
Sonotube Concrete Calculator
Concrete volume for round column forms (Sonotube-style tubes).
Concrete Pier Calculator
Concrete volume for pier foundations with an optional bell base.
Concrete Guides
How to Calculate Concrete Volume for a Slab
Concrete volume for a slab is length × width × depth, converted to a single unit. Here's the formula, the unit traps, and a worked example.
How Much Concrete Do I Need? Complete Guide
A complete walkthrough for sizing a concrete order — volume, waste allowance, and the difference between the exact figure and what you actually call in.
How to Calculate Concrete With Waste
Waste allowance turns a mathematical volume into a realistic order quantity. Here's how much to add and why it's never applied silently.
How to Calculate Concrete for Fence Posts
Fence-post concrete isn't the hole volume alone — it's the hole minus the post that sits inside it, repeated per post.
How to Calculate Concrete for Footings
A footing is calculated the same way as a slab — length × width × depth — but often needs to be split into multiple sections for a stepped or T-shaped profile.