Acres to Hectares Converter
Convert acres to hectares instantly. Enter acres to get hectares using the 0.404686 factor, with the reverse hectares to acres direction shown.
Updated 2026-06-14 · Free · No sign-up · Runs privately in your browser
Show the formula & steps
How the Acres to Hectares Converter Works
This tool converts acres to hectares (ha) and back. The acre is the traditional imperial land unit in the US and UK, while the hectare is the metric area unit equal to 10,000 square meters used worldwide. One acre is about 0.4 hectares.
The Formula
Hectares = acres × 0.404686 Acres = hectares ÷ 0.404686
The factor comes from the exact definitions: 1 acre is 4,046.86 m² and 1 hectare is 10,000 m².
Worked Example
Convert 10 acres to hectares:
- Hectares = 10 × 0.404686 = 4.05 ha
A larger property of 100 acres:
- 100 × 0.404686 = 40.47 ha
Going the other way, 5 hectares in acres:
- Acres = 5 ÷ 0.404686 = 12.36 acres
Acres to Hectares Quick Reference
| Acres | Hectares |
|---|---|
| 1 | 0.405 |
| 5 | 2.023 |
| 10 | 4.047 |
| 50 | 20.234 |
| 100 | 40.469 |
Where You Use This Conversion
This conversion matters in farming, land surveying and property sales that cross between imperial and metric systems. A US ranch listed in acres can be compared with European farmland in hectares, and government land records in metric countries can be translated for buyers used to acres. Because a hectare is about two and a half acres, the numbers shrink noticeably when converting from acres to hectares.
Frequently asked questions
How many hectares are in an acre?+
One acre equals about 0.404686 hectares. So 10 acres is about 4.05 hectares. To convert acres to hectares, multiply by 0.404686.
How do I convert acres to hectares?+
Multiply the acre value by 0.404686. For example, 10 acres × 0.404686 = 4.05 hectares. To reverse it, divide hectares by 0.404686 or multiply by 2.47105.
What is 1 acre in hectares?+
1 acre equals about 0.405 hectares, a little under half a hectare. An acre is 4,046.86 square meters, while a hectare is 10,000 square meters.
How many hectares is 100 acres?+
100 acres equals about 40.47 hectares. Large US and UK landholdings are often quoted in acres, so converting to hectares helps compare them with metric land records.
Is an acre smaller than a hectare?+
Yes. An acre is about 0.4 hectares, so a hectare is roughly two and a half acres. It takes about 2.47 acres to make one hectare.