# Hectares to Ares (ha to a)

Source: https://www.unitconvertercalculator.com/area/hectares-to-ares/

**1 ha = 100 a**

One hectare equals exactly 100 ares. To convert, multiply the number of hectares by 100 or move the decimal point two places to the right. This is the downscaling companion within the metric land unit chain, moving from the agricultural scale of hectares to the residential scale of ares.

The relationship is built into the names. The hectare is literally a hecto-are, meaning one hundred ares. The prefix hecto means one hundred in Greek, the same prefix that gives hectoliters and hectopascals. So the conversion is not just clean — it is definitional. One hectare is one hundred ares by construction, with no approximation possible.

This conversion is primarily relevant in German-speaking countries, where both units are in active daily use. A farmer who owns 4.5 hectares of land can describe each of the subdivided plots in ares. A real estate agent listing a 0.8-hectare rural property might break it into building plot (6 Ar), garden (12 Ar), orchard (18 Ar), and meadow (44 Ar) for the detailed listing. The hectare states the total; the ares give the breakdown.

In Austrian and Swiss land registry systems, the are is the working unit for individual parcels while the hectare appears in the summary statistics. A municipality's cadastral records might show a housing development of 3.2 hectares subdivided into 48 parcels averaging about 6.7 ares each. The surveyor works in ares; the planner summarizes in hectares; and the conversion between them is always multiplication or division by 100.

## Formula

Multiply the hectare value by 100

## Conversion Table

| Hectares (ha) | Ares (a) |
|---|---|
| 0.03 ha | 3 a |
| 0.05 ha | 5 a |
| 0.1 ha | 10 a |
| 0.2 ha | 20 a |
| 0.5 ha | 50 a |
| 1 ha | 100 a |
| 2 ha | 200 a |
| 5 ha | 500 a |
| 10 ha | 1000 a |
| 20 ha | 2000 a |
| 50 ha | 5000 a |
| 100 ha | 10000 a |
| 200 ha | 20000 a |
| 500 ha | 50000 a |
| 1000 ha | 100000 a |
| 5000 ha | 500000 a |
| 10000 ha | 1000000 a |
| 50000 ha | 5000000 a |

## Units

### Hectare (ha)

A metric unit of area equal to 10,000 square meters or 100 ares. The primary unit for measuring agricultural land, forests, and medium-sized land parcels worldwide. Accepted for use with the SI system.

### Are (a)

A metric unit of area equal to 100 square meters. Primarily used in European land measurement, especially for residential plots and gardens. One hundredth of a hectare.

## Background

Vineyard management in German-speaking wine regions shows this conversion clearly. The Rheingau wine region covers about 3,200 hectares or 320,000 ares of vineyards. Individual vineyard plots in the Rheingau range from about 2 to 20 ares, with most estates consisting of many small, separate parcels scattered across different hillside sites. The estate owner reports total holdings in hectares; the cellar master tracks each parcel in ares.

In Switzerland, the conversion appears in the official land registry unit. Swiss cadastral maps typically record parcel areas in ares and square meters simultaneously, with the are figure appearing prominently in property documents. A Swiss farmhouse plot of 0.12 hectares is 12 ares in the registry notation, and that 12 Ar figure appears on the property deed.

Allotment garden associations in Germany organize their sites in both units. A colony of 80 Schrebergärten, each averaging 3.5 ares, totals 280 ares or 2.8 hectares. The association's annual report gives the total in hectares; the individual plot lease specifies ares. Both figures appear regularly in the same document.

Land consolidation projects, common in rural Germany and Austria where historical subdivision has created many tiny fragmented parcels, use both units throughout. The total area being consolidated might be 120 hectares, while each of the hundreds of individual parcels is described in ares. The consolidation outcome produces fewer, larger parcels — from an average of 0.8 ares to an average of 3 ares — while the total area remains 12,000 ares or 120 hectares.

## Good to Know

This conversion is a DACH specialty. Germany, Austria, and Switzerland use both hectares and ares as active units in land law, agriculture, and property records. The factor of 100 is exact and definitional — the word hectare literally means one hundred ares.

## FAQ

### How many ares are in one hectare?

Exactly 100 ares. The word hectare literally means one hundred ares — the prefix hecto means 100. This makes the conversion definitional rather than approximate.

### How do I convert hectares to ares?

Multiply the number of hectares by 100. For example, 2.5 hectares times 100 equals 250 ares. You can also move the decimal point two places to the right.

### When is this conversion used?

Primarily in German, Austrian, and Swiss land administration, where ares describe individual residential and vineyard parcels while hectares describe total farm holdings and land-use zones. Both units appear together in property deeds, cadastral maps, and agricultural records.

## Non-Frequently Asked Questions

### Why does Germany have a unit that the rest of the world ignores?

The are is actually part of the original metric system, introduced in France in 1795 alongside the meter and liter. Most of the world moved straight from square meters to hectares and forgot about the are. Germany, Austria, and Switzerland kept it because it perfectly fits the residential property scale. The rest of the world simply does not have as many Schrebergärten.

### How many ares is a typical German wine estate?

A small family wine estate in Germany might own 5 to 15 hectares, or 500 to 1,500 ares. That sounds like a lot of ares until you realize they are usually scattered across 20 to 50 separate small parcels in different vineyards, each a few ares in size. German wine geography is gloriously complicated.

### If I dug up one are of garden per day, how long to clear one hectare?

Exactly 100 days. At one are of digging per day, clearing 100 ares takes 100 days. That is about three and a half months of daily digging. Your back would file a formal complaint well before day 30.

## See Also

- [Ares to Hectares](https://www.unitconvertercalculator.com/area/ares-to-hectares/)