Free Acres to Hectares Converter for Land in Europe

By ExpatMoneyEU Research Team · Published 14 November 2026 · Updated 14 November 2026

Researched by ExpatMoneyEU Team · Last updated 14 November 2026 · Data: NIST SP 811, Appendix B

What this converter does: it turns an area in acres into the same area in hectares, so a plot quoted in acres can be compared directly with European land listings quoted in hectares. If your starting figure is already in hectares, use the Free Hectares to Acres Converter instead. If the plot comes with a house, our Free House Buying Costs Calculator for Europe helps you work out what buying the property would cost overall.

How to use the converter

1. Type the area in the acres box — the hectare value updates as you type, with no button to press.
2. Read the result line: the converted area, plus both directions of the rate (1 acre in hectares, and 1 hectare in acres).
3. To go the other way, type in the hectares box instead, or press Swap direction to flip the converter and carry the converted value over as the new input.
4. Decimals are welcome: 2.5 acres converts just as easily as 2 acres.
5. Check the plot figure: a listing may quote the whole plot, the buildable area or the farmed area — compare like with like.

The formula

Let A_ac be the area in acres and A_ha be the same area in hectares. The two directions are:

• Hectares from acres: A_ha = A_ac × 0.40468564224
• Acres from hectares: A_ac = A_ha × 2.47105381467 (equivalently, A_ha ÷ 0.40468564224)

The number 0.40468564224 is exact, not rounded: the acre is defined as 4,840 square yards, the yard is exactly 0.9144 m, so one acre is 4,046.8564224 m² exactly — and a hectare is 10,000 m², so 4,046.8564224 ÷ 10,000 = 0.40468564224 ha. Any rounding you see comes only from how many decimal places are displayed. For the reverse direction in its own tool, see the Free Hectares to Acres Converter.

Worked example

A plot is listed as 12 acres, and you want to compare it with European listings priced per hectare:

• Multiply by the exact factor: 12 × 0.40468564224 = 4.85622770688 ha (shown as 4.8562 ha)
• Check the other way: 4.85622770688 ÷ 0.40468564224 = 12 acres, back where we started
• Illustrative price check (hypothetical numbers only, not a market rate): at an assumed €20,000 per hectare, the plot would cost 4.85622770688 × €20,000 = €97,124.55, which is about €97,124.55 ÷ 12 = €8,093.71 per acre

So the plot is just under 5 hectares. Try 12 in the converter above to see the same answer.

Acres to hectares conversion table

Hectares and square metres are shown to four decimal places. The underlying factor is exact, so the only rounding is in the display.

Everyday benchmarks: sizes that build a feel for the units

The sizes below are round examples to build a feel for the two units — not statistics about any market. Each line is a straight conversion of the same area:

• One acre — 1 acre = 0.4047 ha = 4,046.8564 m². It is also exactly 43,560 sq ft and 4,840 square yards.
• Half an acre — 0.5 acres = 0.2023 ha. A garden-plot-sized example.
• One hectare in reverse — 1 ha = 2.4711 acres. A hectare is a square 100 m × 100 m.
• Ten acres — 10 acres = 4.0469 ha. A small-field-sized example.
• A hundred acres — 100 acres = 40.4686 ha. A farm-sized example.
• Two hundred fifty acres — 250 acres = 101.1714 ha. Just over a square kilometre of land.

For floor area rather than land, the Free Square Feet to Square Metres Converter and Free Square Metres to Square Feet Converter cover homes and flats.

Rounding and exactness

The factor 0.40468564224 is exact, so this converter never estimates: the only rounding is the four decimal places shown on screen. For money sums, convert first with the full result and round the euros last. For a purchase, the land registry or survey figure governs — this converter translates that figure into the other unit, it does not measure the land.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units (SI), Appendix B: conversion factors for the foot, yard, square foot, acre and hectare.
• BIPM SI Brochure — the International System of Units, definitions of the metre and the hectare.
• International Yard and Pound Agreement, 1959 — 1 yard = 0.9144 m exactly, giving 1 ft = 0.3048 m, 1 sq ft = 0.09290304 m² and 1 acre = 4,046.8564224 m² exactly.