Area Units Converter

Overview

This reference page provides conversion factors and tools for translating between common area units used in engineering, construction, land surveying, and manufacturing. Area is a two-dimensional quantity ($\text{length}^2$), so all conversion factors are squared versions of their linear counterparts.

Original source text preserved: "Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!" Original heading preserved: "Convert between units of area." Original calculator description preserved: "This calculator can used to convert between commonly used area units."

Key Formulas

To convert an area value from one unit to another, multiply by the appropriate factor:

$A_{\text{target}} = A_{\text{source}} \times \frac{\text{source unit in m}^2}{\text{target unit in m}^2}$

For example, converting square feet to square meters:

$A_{\text{m}^2} = A_{\text{ft}^2} \times 0.09290$

For circular areas, the base unit conversion applies after:

$A = \frac{\pi d^2}{4}$

Variables

Conversion Factors

Quick-Reference Pairs

Area Conversion Calculator

Use the table above to find the correct conversion factor. Enter your source area as the input, and the factor that multiplies it to reach the target unit.

For instance, to convert 100 ft² to m², enter 100 for the area and 0.09290 for the factor.

Restored Original Source Tables

The following tables are restored from the original source page to preserve the complete reference data.

Engineering Notes

• Squared relationship: A common mistake is using linear conversion factors for area. Since area is length × length, you must square the linear factor. For example, $1 \text{ in} = 25.4 \text{ mm}$, but $1 \text{ in}^2 = 645.16 \text{ mm}^2$, not $25.4 \text{ mm}^2$.
• Precision in design: For structural and architectural drawings, conversions should maintain at least four significant figures. Rounding too early can cause misalignment or material shortages.
• Land surveying: In the US, land areas are commonly reported in acres. Internationally, hectares are standard. One acre equals approximately 0.4047 hectares or 43,560 ft².
• Metric prefixes: Note that the prefix applies to the base length, not the area. One square kilometer is $(1000 \text{ m})^2 = 1{,}000{,}000 \text{ m}^2$, not $1000 \text{ m}^2$.
• Barns: The barn ($10^{-28} \text{ m}^2$) is a unit used in nuclear and particle physics to express cross-sectional areas of atomic nuclei.
• Always document your conversion factors in calculations for traceability, especially in regulated industries or formal submittals.

References

• Original Source — Engineering ToolBox Area Units Converter