# Cubic Feet Calculator

Calculate volume in cubic feet for boxes, rooms, and cylinders. Convert to cubic yards, cubic meters, and gallons instantly. Includes a quantity multiplier for multiple items.

## What this calculates

Need to know how much space a box takes up, how much water a tank holds, or how many cubic yards of gravel to order? This calculator figures out the volume in cubic feet for rectangular and cylindrical shapes, then converts to cubic yards, cubic meters, and US gallons so you can order materials or plan storage with confidence.

## Inputs

- **Shape** — options: Rectangular / Box, Cylinder — Select the shape of the object or space
- **Length** (ft) — min 0 — Length of the box or room (not used for cylinders)
- **Width** (ft) — min 0 — Width of the box or room (not used for cylinders)
- **Height** (ft) — min 0 — Height of the box, room, or cylinder
- **Radius** (ft) — min 0 — Radius of the cylinder (cylinders only)
- **Quantity** — min 1, max 1000 — Number of identical objects or spaces

## Outputs

- **Volume per Unit** (ft³) — Volume of a single object or space
- **Total Volume** (ft³) — Combined volume for all units
- **Total Volume** (yd³) — Useful for ordering fill material or concrete
- **Total Volume** (m³) — Metric volume equivalent
- **Total Volume** (gallons) — Liquid capacity (US gallons)

## Details

The formulas:

  - Rectangular / Box: Volume = Length x Width x Height

  - Cylinder: Volume = pi x Radius2 x Height

Once you have cubic feet, converting to other units is simple multiplication:

  - Cubic yards: divide by 27 (there are 27 cubic feet in a cubic yard)

  - Cubic meters: multiply by 0.0283168

  - US gallons: multiply by 7.48052

Common uses for cubic feet calculations:

  - Shipping: Freight carriers charge by dimensional weight, which depends on the box's cubic footage

  - Storage: Moving companies estimate truck space in cubic feet. A typical 26-foot moving truck holds about 1,700 cubic feet.

  - Landscaping: Mulch, soil, and gravel are often sold by the cubic yard. Calculate cubic feet first, then divide by 27.

  - Aquariums and tanks: Convert cubic feet to gallons to know exact water capacity

If you are measuring in inches rather than feet, switch the unit dropdown to inches and the calculator handles the conversion automatically.

## Frequently Asked Questions

**Q: How do I calculate cubic feet of a box?**

A: Multiply the length, width, and height together. A box that is 3 feet long, 2 feet wide, and 1.5 feet tall has a volume of 9 cubic feet (3 x 2 x 1.5 = 9).

**Q: How many cubic feet are in a cubic yard?**

A: There are exactly 27 cubic feet in one cubic yard (3 x 3 x 3 = 27). To convert cubic feet to cubic yards, divide by 27. For example, 54 cubic feet equals 2 cubic yards.

**Q: How many gallons are in a cubic foot?**

A: One cubic foot holds approximately 7.48 US gallons. A 10 cubic foot tank, for instance, would hold about 74.8 gallons of water.

**Q: How do I calculate the cubic feet of a cylinder?**

A: Use the formula pi x radius squared x height. For a cylinder with a 2-foot radius and a 5-foot height: 3.14159 x 4 x 5 = 62.83 cubic feet. Make sure you use the radius (half the diameter), not the full diameter.

**Q: What is the difference between cubic feet and board feet?**

A: A cubic foot is a volume measurement for any material (1 ft x 1 ft x 1 ft). A board foot is specific to lumber and equals 1 ft x 1 ft x 1 inch (1/12 of a cubic foot). There are 12 board feet in one cubic foot.

---

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