Summary table
| Measure | Result |
|---|---|
| Side | — |
| Diagonal | — |
| Perimeter | — |
| Area | — |
Square area calculator
Compute square area, perimeter, diagonal or side from any given value, with units and formulas.
Square area
Compute square area, perimeter, and diagonal starting from a single known value.
Input data
e.g. 5.75
Accepts comma or dot as decimal separator.
0–10
Controls rounding for all outputs.
Results
Main area
Enter your data and press Calculate
Side (s)
—
Diagonal (d = s·√2)
—
Perimeter (P = 4s)
—
Area (A = s²)
—
Area conversions
mm²
—
cm²
—
m²
—
in²
—
ft²
—
Includes every calculated value.
Formulas used
- Area from side: A = s²
- Diagonal from side: d = s·√2
- Perimeter from side: P = 4s
- Side from area: s = √A
Which input can I start from?
You can start from the side, diagonal, perimeter, or area. The tool applies square formulas to return every other magnitude and prepares all conversions instantly.
How do area conversions to cm², m², in², or ft² work?
Select the base unit (m, cm, mm, in, or ft) and the calculator normalizes the value before showing the area in every available unit, including the squared version of your selection.
Is the diagonal calculated with the Pythagorean theorem?
Yes. It relies on d = s·√2 and its inverse s = d/√2 to obtain the side even when you only know the diagonal.
What precision do the results use?
The “Decimals” field lets you choose between 0 and 10 digits. Every output is rounded with the same precision to avoid discrepancies.
Can I enter decimals and copy the results?
Yes. You can type numbers with a comma or a dot and then use “Copy results” to grab a complete summary of sides, perimeter, diagonal, and converted areas.
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