2.5 cubed equals 15.6250, because 2.5 × 2.5 × 2.5 = 15.6250.

How do you cube a number?

To cube a number, multiply it by itself three times: n³ = n × n × n. The cube of a negative number is also negative (odd power). Geometrically, n³ represents the volume of a cube with edge length n.

2.5 Cubed = 15.6250

Quick Answer

2.5³ = 15.6250

Because 2.5 × 2.5 × 2.5 = 15.6250

Cubed Calculator

Cubed (n³) Cube Root (∛n) Simplify Cube Root Is N a Perfect Cube? Exponents (bⁿ)

Use the calculator above to cube any real number (positive, negative, or decimal). See below the step-by-step method, the formula, and tables of common perfect cubes.

Step-by-Step: 2.5 Cubed

Cubing a number means multiplying it by itself three times. To compute 2.5³:

Multiply 2.5 by itself (squaring):
2.5 × 2.5 = 6.25
Multiply the result by 2.5 again:
6.25 × 2.5 = 15.6250

2.5³ = 15.6250

Formula

The cube of a number n is defined as:

n³ = n × n × n

Equivalently, in exponent notation: n³ (read as "n cubed" or "n to the third power").

Geometrically, n³ represents the volume of a cube with edge length n — that's where the name comes from.

How to Cube a Number

Write the number you want to cube.
Square it first (multiply by itself once): n × n = n².
Multiply the result by n one more time: n² × n = n³.
If n is negative, parenthesize when writing each factor and remember the result is negative.

Nearby Cubed Values

n	n³
1	1
2	8
3	27
4	64
5	125
6	216
7	343
8	512
9	729
10	1,000
11	1,331
12	1,728

Cubed Numbers Tables

Cubed Numbers Table for Positive Numbers

n	n³
0	0
1	1
2	8
3	27
4	64
5	125
6	216
7	343
8	512
9	729
10	1000
11	1331
12	1728
13	2197
14	2744
15	3375
16	4096
17	4913
18	5832
19	6859
20	8000

Cubed Numbers Table for Negative Numbers

n	n³
-0	0
-1	-1
-2	-8
-3	-27
-4	-64
-5	-125
-6	-216
-7	-343
-8	-512
-9	-729
-10	-1000
-11	-1331
-12	-1728
-13	-2197
-14	-2744
-15	-3375
-16	-4096
-17	-4913
-18	-5832
-19	-6859
-20	-8000

References

Popular Cubed Calculations

Top n³ values from search demand + real traffic — click any to see the step-by-step:

Related Calculators

Cube Root Calculator (∛n) — the inverse operation
Simplify Cube Root — radical form (e.g. ∛24 = 2∛3)
Is N a Perfect Cube? — check any integer (incl. negatives)
Geometry Calculators — volume of a cube = side³