# Area Converter

> Area converter: square feet, acres, hectares, and square meters. Free area converter with the formula shown - runs entirely in your browser, no signup.

- **Canonical URL:** https://boringtoolskit.com/area-converter/
- **Category:** Converters
- **Evidence level:** authored-methodology
- **Reviewed:** 2026-09-20
- **Last verified:** 2026-10-12
- **Privacy:** Inputs and results stay in this browser unless the page clearly labels an external request.

## How it works

Area = value x (square metres per source unit) / (square metres per target unit). Factors: 1 m2 = 0.092903 ft2, 4046.86 m2 per acre, 10000 m2 per hectare.

## Worked example

1 acre = 4047 sq meter · 1 hectare = 2.471 acre · 1 sq foot = 0.0929 sq meter

## Assumptions

- Inputs are treated as exact decimal values.
- Standard (not historical or survey) unit definitions are used.
- The calculation uses the factors at the precision shown in the formula panel; rounding beyond that is display-only and adds no accuracy.

## Common questions

### Why convert through square meter instead of directly?

Routing every unit through a single base (square meter) means each unit needs only one exact factor against the standard, and any pair combines cleanly. Direct pair factors drift apart over time in hand-maintained tables; a base-unit graph cannot.

### Where do these exact factors come from?

From published standards (NIST: SP 811 conversion factors). Units like the inch are defined exactly (1 in = 2.54 cm since 1959), so conversions between standard units are exact, not approximate.

### How many decimal places should I trust?

The math is exact to the precision shown. The practical limit is your input: a tape measure is only good to ~1 mm and a kitchen scale to ~1 g, so 3–4 significant figures already exceeds the measurement's own accuracy.

## Sources

- [SP 811 conversion factors](https://www.nist.gov/pml/special-publication-811)

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