Acres to Hectares Converter

Convert acres to hectares instantly, with a reference table covering farmland, plots and estates.

Acres

Hectares

1 ac = 0.4047 ha

Multiply acres by 0.40468564 to get hectares.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Acres to hectares reference table

The conversions people look up most often, rounded to 4 decimal places.

Common acres to hectares conversions
Acre (ac)	Hectare (ha)
0.25 ac	0.1012 ha
0.5 ac	0.2023 ha
1 ac	0.4047 ha
2 ac	0.8094 ha
5 ac	2.0234 ha
10 ac	4.0469 ha
20 ac	8.0937 ha
50 ac	20.2343 ha
100 ac	40.4686 ha
250 ac	101.1714 ha
500 ac	202.3428 ha
1,000 ac	404.6856 ha
2,471 ac	999.9782 ha

How the acres to hectares converter calculation works

An acre is exactly 0.40468564224 hectares:

hectares = acres × 0.404686

An acre was originally the area a man with an ox could plough in a day — a furlong long by a chain wide, which is 660 by 66 feet, or 43,560 square feet. A hectare is far tidier: 100 m by 100 m, or 10,000 square metres.

The useful anchor is that one hectare is about 2.47 acres, so a hectare is roughly two and a half acres.

Common holdings:

0.25 acres (a suburban US lot) → 0.101 ha
1 acre → 0.405 ha
10 acres → 4.047 ha
100 acres → 40.47 ha
640 acres (a US survey section, one square mile) → 258.999 ha

Where the unit matters. UK and Irish farmland is still traded in acres despite metric being official, while EU agricultural subsidies and land registries work in hectares — so the same field routinely has two numbers attached to it. Australian and New Zealand rural property is quoted in hectares; American farmland almost always in acres.

A useful mental picture: a football pitch is about 1.76 acres or 0.71 ha, and an American football field including end zones is 1.32 acres or 0.535 ha. Neither is a hectare, though the pitch is closer than most people guess.

To convert back, multiply hectares by 2.47105.

Frequently asked questions

How do I convert acres to hectares?

Multiply the number of acres by 0.404685642 to get hectares.

How many hectares are in 5 ac?

5 ac equals 2.0234 ha. The reference table on this page lists the other values people look up most often.

How do I convert hectares back to acres?

Divide the number of hectares by 0.404685642, or use the swap control on the converter above.

Is this conversion exact?

Yes. The factor is fixed by international definition rather than measured, so the conversion is exact - only the displayed rounding limits precision.

Acres to Hectares Converter