Cube Surface Area
Six square faces means the surface area is six times the edge squared. The space diagonal — corner to opposite corner through the middle — is the edge times √3.
Your numbers
Surface area
600cm²
Volume
1,000cm³
Diagonal
17.321cm
Formula
Surface area = 6 × Side ²
Wrapping paper needs more than the surface area. Folds and overlaps usually take another 15–20%.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Side (cm)One edge of a square or cube. | 10 | 0 and up |
Step by step
Quick reference table
Results when only Side (cm) changes and everything else stays put.
| Side (cm) | Surface area (cm²) | Volume (cm³) | Diagonal (cm) |
|---|---|---|---|
| 5 | 150 | 125 | 8.66 |
| 7.5 | 337.5 | 421.88 | 12.99 |
| 10 | 600 | 1,000 | 17.321 |
| 15 | 1,350 | 3,375 | 25.981 |
| 20 | 2,400 | 8,000 | 34.641 |
What each result means
| Result | At default values |
|---|---|
| Surface area (cm²)The total area of a solid’s outer skin. | 600 |
| Volume (cm³)The space a solid holds — length cubed. | 1,000 |
| Diagonal (cm)Corner to opposite corner. | 17.321 |
Common mistakes
Wrapping paper needs more than the surface area. Folds and overlaps usually take another 15–20%.
Glossary
- Side
- One edge of a square or cube.
- Surface area
- The total area of a solid’s outer skin.
- Volume
- The space a solid holds — length cubed.
- Diagonal
- Corner to opposite corner.
Frequently asked questions
Q. How is Cube Surface Area calculated?
Surface area = 6 × Side ² — Six square faces means the surface area is six times the edge squared. The space diagonal — corner to opposite corner through the middle — is the edge times √3.
Q. Can you walk through an example?
With Side 10cm, the answer is Surface area 600cm².
Q. What do I need to enter?
Enter Side. The result recalculates as you type, and an empty box counts as zero.
Q. How much does the answer move if I change a number?
Changing only Side (cm) moves the answer to Side (cm) 5 → Surface area (cm²) 150 and Side (cm) 20 → Surface area (cm²) 2,400. The table below lays out five steps.
Q. How are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
Q. Anything to watch out for?
Wrapping paper needs more than the surface area. Folds and overlaps usually take another 15–20%.
Related calculators
Keep your length units consistent across inputs — mixing centimetres and metres throws results far off.