Calculator for Concrete is a free calculator site for concrete work: 43 tools that turn measurements into cubic yards, bags, weight and cost, each backed by a full guide and a blog that answers the pricing and how-to questions behind the numbers.
What This Site Does
Every calculator on this site answers one practical question, how much material does this job need?, and shows its working. Enter the dimensions of a slab, footing, column, wall, staircase or any of the other shapes covered here, and the tool returns the order quantity in cubic yards, the bag count if you are mixing yourself, the total weight for transport and load checks, and an estimated cost from the prices you type in.
There is no signup, no fee and no locked results. The tools run entirely in your browser, and every result on the page is calculated live from your own inputs.
The Tools
The 43 calculators cover the whole estimating chain:
- Volume: slab, cubic yards, footing, column, wall, stairs, curb & gutter, circular, monolithic, beam, pier and sonotube.
- Materials: bags, mix design, mortar, mix water, bag pallets and bag cost.
- Reinforcement: rebar, rebar weight, rebar spacing and wire mesh.
- Aggregates: gravel, pea gravel, tons to yards, gravel cost, gravel driveways and crushed concrete.
- Projects: driveways, patios, sidewalks, pads, post holes and fence posts, plus weight, cost, tank & trench and flowable fill.
How the Numbers Work
Every tool is built on the same published arithmetic: volume in cubic feet divided by 27 for cubic yards, standard US bagged-concrete yields (an 80 lb bag makes 0.60 ft³), 150 lb per cubic foot for normal-weight concrete, and a 5–10% waste allowance that you control. Each calculator page shows its formula and a worked example whose figures were checked by hand against the tool before the page was published, so you can verify any result yourself with a pencil.
Our guides cite the standards the trade works to: National Ready Mixed Concrete Association (NRMCA) ordering and yield guidance, American Concrete Institute (ACI) practice, and Portland Cement Association (PCA) design guidance. Where a figure depends on your local building code, such as frost depth or footing size, the pages say so, and the code governs.
Who Uses This Site
Builders sanity-check a supplier’s yardage before signing a pour schedule. Contractors price small jobs without calling the plant for every estimate. Engineers and architects use the weight figures as a first-pass check. Homeowners use the tools to walk into a supplier conversation already knowing the number. The Editorial Standards page explains how the content behind the tools is researched, checked and corrected.
Talk to Us
Found a figure that looks wrong, or a job our calculators do not cover yet? The Contact page is the fastest way to reach the editorial team, corrections from readers are a normal part of how these pages stay accurate.