By Kevin Beck Updated Aug 30, 2022
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When we talk about a cubic meter (m³), we refer to a volume unit in the metric system. Though the term is common, visualizing it can be challenging.
The International System of Units (SI) was introduced in the late 18th century to replace inconsistent units like feet and inches. The meter was originally defined as one‑ten‑millionth of the distance from the equator to the North Pole, while the kilogram was based on the mass of one liter of water. These definitions have evolved with advancements in measurement precision.
A cubic meter represents the volume of a cube that is 1 m on each side, or any shape whose volume equals 1 m³. For instance, a rectangular tank measuring 2 m × 1 m × 0.5 m has a volume of 1 m³ (2 × 1 × 0.5 = 1).
Historically, the term stere was used for a cubic meter, especially in the timber industry. Today, the SI system prefers the notation m³. One cubic meter equals 35.315 cubic feet or 0.276 cord.
1. Aquarium Tank Volume
An aquarium measuring 20 m long, 20 m wide, and 10 m deep holds 20 × 20 × 10 = 4,000 m³ of water. Since 1 L of water weighs 1 kg, a cubic meter holds 1,000 kg, or roughly 2,200 lb (1 metric ton). Thus, 4,000 m³ of water has a mass of 4,000 t (≈ 4,400 US tons).
2. Inflated Ball Capacity
A spherical ball 2 m in diameter (radius = 1 m) can hold a volume of V = (4/3)πr³ = (4/3)π(1)³ ≈ 4.19 m³, which is about 12.57 m³ (rounded to two decimal places).
Use an online cubic meter calculator to switch between m³ and other units like gallons or cubic yards. The Resources section on our site offers multiple conversion tools.
