# Concrete Weight Calculator

Calculate the weight of concrete for slabs, columns, and footings. Enter dimensions and density to get weight in pounds, tons, and kilograms.

## What this calculates

Knowing how much your concrete weighs matters for structural loading, transportation, and crane sizing. Enter the shape and dimensions of your concrete element to calculate its weight. Standard concrete weighs about 150 lb per cubic foot, but lightweight and heavyweight mixes differ significantly.

## Inputs

- **Shape** — options: Rectangular (Slab/Footing), Cylindrical (Column/Pier)
- **Length** (ft) — min 0 — For rectangular shapes only
- **Width** (ft) — min 0 — For rectangular shapes only
- **Diameter** (in) — min 0 — For cylindrical shapes only
- **Thickness / Height** (in) — min 0, max 120 — Slabs: 4-6 in, footings: 8-12 in, columns: 36-96 in
- **Concrete Density** (lb/ft³) — min 100, max 200 — Standard: 150, lightweight: 110, heavyweight: 180

## Outputs

- **Volume** (ft³)
- **Volume** (yd³)
- **Weight** (lbs)
- **Weight** (tons)
- **Weight** (kg)

## Details

## Concrete Weight by Type

Not all concrete weighs the same. The density depends on the aggregate used:

| Concrete Type | Density (lb/ft³) | Use Case |
|---|---|---|
| Lightweight | 90-115 | Upper floors, precast panels |
| Normal weight | 140-150 | Slabs, footings, walls |
| Heavyweight | 170-200 | Radiation shielding, counterweights |

### Quick Weight References

- **4 inch slab, 1 ft²:** About 50 lbs
- **4 inch slab, 10x10 ft:** About 5,000 lbs (2.5 tons)
- **12 inch diameter column, 8 ft tall:** About 942 lbs
- **1 cubic yard of concrete:** About 4,050 lbs (2 tons)

### Why Concrete Weight Matters

You need to know concrete weight when sizing structural supports beneath a slab, figuring out how many truckloads a pour requires, or determining if a floor can handle the load. A standard concrete truck holds about 10 cubic yards, which weighs around 40,000 lbs.

## Frequently Asked Questions

**Q: How much does a cubic yard of concrete weigh?**

A: A cubic yard of standard concrete weighs about 4,050 pounds (roughly 2 tons). Lightweight concrete runs about 2,500-3,100 lbs per cubic yard, while heavyweight concrete can reach 5,000+ lbs per cubic yard.

**Q: How much does a 4 inch concrete slab weigh per square foot?**

A: A 4 inch thick concrete slab weighs about 50 pounds per square foot using standard 150 lb/ft³ concrete. A 6 inch slab weighs about 75 lbs/ft², and an 8 inch slab weighs about 100 lbs/ft².

**Q: Does wet concrete weigh more than cured concrete?**

A: Freshly mixed concrete weighs slightly more than cured concrete because of the water content. The difference is small, typically 5-10%, as most of the mix water gets consumed in the chemical curing process. For estimating purposes, use the same density for both.

**Q: How do I calculate the weight of a concrete column?**

A: Multiply pi times the radius squared times the height to get volume in cubic feet. Then multiply by 150 (standard density). For example, a 12 inch diameter column that is 8 feet tall: 3.14159 x 0.25 x 8 = 6.28 ft³ x 150 = 942 lbs.

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Source: https://vastcalc.com/calculators/construction/concrete-weight
Category: Construction
Last updated: 2026-04-08