Squaring a factor is not optional
This is the mistake area conversion invites, and it is not a careless one — it is the natural thing to do. A metre is 3.2808 feet, so converting square metres to square feet by multiplying by 3.2808 feels obviously right. It is wrong by a factor of 3.28: a square metre is 10.7639 square feet, because a square metre is a square one metre on each side, and both sides convert.
Put visually: a square metre is 3.28 feet wide and 3.28 feet deep, so it contains 3.28 × 3.28 square feet. Every area factor is a length factor squared, and every volume factor is a length factor cubed — which is why a cubic yard is 27 cubic feet rather than 3.
The error is durable because the result stays plausible. A 90 m² flat converted wrongly reads as 295 ft² instead of 969 ft² — both are numbers a flat could have, and nothing about 295 announces itself as wrong unless you know the room. This converter does the squaring for you, and shows every unit at once so the relationship between them is visible rather than assumed.
Acres and hectares
The acre is not a shape and never was. It is exactly 4,840 square yards — 43,560 square feet — and that odd-looking number is historical: an acre was notionally the land a yoke of oxen could plough in a day, standardised as a strip one furlong long by one chain wide. Nothing about it requires a square, and a real acre is usually whatever shape the field is.
The hectare is the metric answer to the same question and is far tidier: exactly 10,000 square metres, or a square 100 m on a side. One hectare is about 2.471 acres, and one acre is about 0.4047 hectares. The are that the hectare is built from — 100 m², a square 10 m on a side — still appears in European land records and in the Indian cent’s neighbourhood of units.
A useful anchor: an international football pitch is roughly 0.7 hectares or 1.75 acres, so an acre is a little over half a pitch and a hectare is a little under one and a half.
Local land units
Land is the one area application where the units stayed local. The tool carries the cent — exactly one hundredth of an acre, 435.6 square feet — which is standard in land records across Tamil Nadu, Kerala, Karnataka and Andhra Pradesh, and the square yard, which north Indian property listings call a gaj.
What the tool deliberately does not carry is the bigha, the katha, the gunta and their relatives. Not because they are unimportant — they are how a great deal of Indian land is actually described — but because they genuinely differ between states and sometimes between districts. A bigha is roughly a third of an acre in some places and nearly two thirds in others. Publishing one number for it would be inventing a national standard that does not exist, and a converter that does that is worse than no converter, because the answer looks authoritative.
If you have a figure in one of those units, the factor to use is the one in your own state’s land records or the registered document — not a general table.
Working out an area before converting it
This page converts an area you already have. Getting that area is a separate step, and worth doing in one unit throughout rather than converting midway.
A rectangle is length × width. A triangle is half the base times the perpendicular height — the perpendicular height, not the sloping side. A circle is π r², where r is the radius, so a circle described by its 4 m diameter has an area of π × 2², about 12.57 m², and using the diameter in place of the radius overstates it fourfold.
For an irregular plot, split it into rectangles and triangles, work each out, and add them — that is what a surveyor does, and it is more reliable than any single formula. For a room with an alcove, the same approach applies. Convert once, at the end, when the total is settled.
Doing it in a spreadsheet
CONVERT handles the square units directly in current Excel and Google Sheets — =CONVERT(A1,"m2","ft2") — and the land units are available as "ang2"-style codes that are easy to get wrong. Written out it is unambiguous: =A1*10.763910417 for square metres to square feet, =A1*4046.8564224 for acres to square metres, and =A1*2.4710538147 for hectares to acres.
If you are building the factor yourself from a length factor, square it in the formula rather than in your head: =A1*(3.280839895^2) makes the squaring visible and reviewable, where a pasted 10.7639 does not show where it came from. That is the same reason this tool derives its area factors by squaring the exact length factors rather than storing a separate table — one definition, no chance of two units disagreeing.
Sources and methodology
Nothing here is fetched and there is no data feed: every figure is computed from what you type, on factors derived by squaring the exact length factors rather than being typed in separately. The definitions are what the sources settle — the acre as 4 840 square yards, the hectare as 10 000 m², and the fact that several Indian land units vary by state and so cannot be given one national factor.