# Hectares to Square meters (ha to m²)

> Convert hectares to square meters: 1 ha = 10000 m². Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.

- Page id: `hectares-to-square-meters` · Quantity: Area (`area`, base unit m2) · Tool: `convert_units`
- Canonical page: https://tttkmbb.com/conversion/hectares-to-square-meters · This document: https://tttkmbb.com/conversion/hectares-to-square-meters.md · JSON: https://tttkmbb.com/conversion/hectares-to-square-meters.json (add `?value=` for a result)

## Formula

- `1 ha = 10000 m²`
- `square meters = hectares × 10000`
- Reverse: `hectares = square meters × 0.0001`

The factor follows from the SI definitions of both units (NIST SP 811); values below are rounded to 6 significant figures, the API returns up to 12.

## Worked examples

- 5 ha = 50000 m²
- 12.5 ha = 125000 m²
- 100 ha = 1000000 m²

## Conversion table

| Hectares (ha) | Square meters (m²) |
| --- | --- |
| 1 | 10000 |
| 2 | 20000 |
| 3 | 30000 |
| 4 | 40000 |
| 5 | 50000 |
| 6 | 60000 |
| 7 | 70000 |
| 8 | 80000 |
| 9 | 90000 |
| 10 | 100000 |
| 15 | 150000 |
| 20 | 200000 |
| 25 | 250000 |
| 30 | 300000 |
| 40 | 400000 |
| 50 | 500000 |
| 75 | 750000 |
| 100 | 1000000 |
| 200 | 2000000 |
| 250 | 2500000 |
| 500 | 5000000 |
| 1000 | 10000000 |

## API

- `GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ha&to_unit=m2` → unified JSON envelope with `result.values.result`, `formula`, `factor`, `sources`, `freshness`
- MCP: server `https://tttkmbb.com/mcp`, tool `convert_units` with `{"value":5,"from_unit":"ha","to_unit":"m2"}`
- All area units: https://tttkmbb.com/api/v1/units?quantity=area · full converter: [Area Converter](https://tttkmbb.com/conversion/area.md)
- Authentication: none. Freshness: `static` (fixed conversion factors).

## FAQ

**How many square meters are in one hectare?**

1 ha = 10000 m². The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.

**What is the formula to convert hectares to square meters?**

Multiply the value in hectares by 10000: square meters = hectares × 10000. For example, 5 ha = 50000 m².

**How do I convert square meters back to hectares?**

Multiply by the inverse factor 0.0001 (hectares = square meters × 0.0001), or use the square meters-to-hectares page.

## Related conversions

- [Square meters to hectares](https://tttkmbb.com/conversion/square-meters-to-hectares.md) (reverse)
- [Square meters to Square feet](https://tttkmbb.com/conversion/square-meters-to-square-feet.md)
- [Square feet to Square meters](https://tttkmbb.com/conversion/square-feet-to-square-meters.md)
- [Acres to Hectares](https://tttkmbb.com/conversion/acres-to-hectares.md)
- [Hectares to Acres](https://tttkmbb.com/conversion/hectares-to-acres.md)
- [Acres to Square meters](https://tttkmbb.com/conversion/acres-to-square-meters.md)
- [Square meters to Acres](https://tttkmbb.com/conversion/square-meters-to-acres.md)
- [Square kilometers to Square miles](https://tttkmbb.com/conversion/square-km-to-square-miles.md)
- [Square miles to Square kilometers](https://tttkmbb.com/conversion/square-miles-to-square-km.md)

## Data Sources

- NIST Special Publication 811 – Guide for the Use of the International System of Units (SI), Appendix B conversion factors — https://www.nist.gov/pml/special-publication-811 (standard, retrieved 2026-09-24)
- BIPM – The International System of Units (SI Brochure, 9th edition) — https://www.bipm.org/en/publications/si-brochure (standard, retrieved 2026-09-24)
- Wikipedia – Conversion of units — https://en.wikipedia.org/wiki/Conversion_of_units (reference, retrieved 2026-09-24)