Area Converter

Squares of every system

Area is where unit systems collide hardest, because two dimensions multiply and every factor appears squared. A garden is listed in hectares or acres, a flat in square metres, a house in square feet, and a plot on a survey map in any of them. This page converts across square millimetres, square centimetres, square metres, square kilometres, hectares, acres and square feet, and anchors the answer in the unit the reader's own listing or quote was written in — which is where comparisons stop wobbling.

The core anchors are few and stable. One metre is 10.7639 square feet at the squared length: 1 m² = 10.76391041671 ft² to be exact. One hectare is 10,000 m². One acre is 4,046.8564224 m², so a hectare is about 2.471054 acres. Everything else on the page is division or multiplication against those anchors.

A worked example, step by step

Problem: a plot listing says 0.25 acres. Your fencing supplier quotes per square metre. What area are you actually fencing?

1. Anchor: 1 acre = 4,046.8564224 m².
2. Multiply: 0.25 × 4,046.8564224 = 1,011.714106 m² (the panel's exact figure).
3. Hectare read: 1,011.714106 m² ÷ 10,000 = about 0.1012 ha — a tenth of a hectare.
4. Feet read only if the supplier thinks in feet: 1,011.714106 m² × 10.76391041671 ≈ 10,890 ft².
5. Sense-check: a quarter-acre is a generous town garden — roughly 1,000 m² matches the mental picture, so no decimal point wandered.

The ordering matters more than any single number: anchor first, multiply second, sanity-check against a familiar yardstick. A plot this size is occasionally mis-quoted by a factor of two when listing platforms mix metres with feet, and the anchor check is what catches it.

Listing sizes, converted

The benchmark row is the one worth memorising: 100 m² is a fraction over 1,076 ft², and every other listing size scales linearly from it — 80 m² is 20% less on both sides of the conversion, at the same precision.

Where land units come from

Land units are the one place this page bends the pattern: hectares and acres are anchors in their own right, not interchange steps. When a council plots a park in hectares and a listing quotes perches or other local relics, remember the historical definitions: an acre was the area a yoke of oxen could plough in a day, and a hectare is a modern metric square of 100 m sides. Both persist because tenure law persists; the tool converts whichever you were handed into whichever your reader uses.

Mistakes that quietly square the wrong number

• Squaring linear conversions freshly. 1 ft = 0.3048 m, but 1 ft² = 0.09290304 m²; converting areas one side at a time misses the square factor.
• Trusting length intuition. Doubling a side quadruples an area; 40,000 m² is not "about 2 hectares", it is exactly 4.
• Mixing listing bases. Usable floor area and gross floor area are different definitions; convert units, not definitions, on this page.
• Quoting per-m² prices across systems unconverted. A 300 per m² wall is about 27.87 per ft², not "30-ish" — divide by 10.7639, always.
• Saying hectare for acre (or the reverse). Land talk misses by a factor of 2.471 when the two are swapped — a 100 ha farm mislabelled as acres becomes 247 ha on paper.

Keep exploring

• Data Storage Converter — the other two-ladder converter on the site: decimal against binary bytes.
• Volume Converter — from 2-D areas to 3-D capacity: litres, cups, gallons.
• Length Converter — linear units, the ingredients every area needs.
• Guide: Unit Conversion Mistakes to Avoid.