Acreage Calculator
Land parcel size in any unit, with sense-check comparisons to real-world references.
How to use
Pick your input mode (length × width OR direct area), pick the unit, and type the value. The calculator returns the same area in five units, with comparisons to football fields, NYC city blocks, parking stalls, and other recognizable references.
- Pick Length × Width if you have a rectangular parcel measured along each side. Pick Area if you already know the total area.
- Pick the unit you are entering: feet/metres for length, ft²/m² for area.
- Type your value(s). The conversion is instant.
- Read the area in acres, hectares, ft², m², and yd², plus comparison-shape readouts.
Reviewed 6 June 2026 · methodology cited
About this calculator
An acre is the standard US and Canadian unit for land parcel size. It is defined as 43,560 square feet, which is approximately the area a yoke of oxen could plough in one day — the historical origin of the unit. A hectare is the metric equivalent at 10,000 square metres, or about 2.47 acres.
This calculator handles both directions: you can enter length × width for a rectangular parcel and read the area in acres, hectares, square feet, square metres, and square yards, or you can enter a known area and read its equivalent in every other unit. It also compares the parcel to recognizable real-world objects — a football field, a NYC city block, a parking stall — so you have a gut sense of the size.
The math behind it
Area conversions: 1 acre = 43,560 ft² = 4,046.86 m² = 0.4047 hectare = 4,840 yd². 1 hectare = 10,000 m² = 107,639 ft² = 2.4711 acres. Square yards exist mainly in legal descriptions and old surveys; modern practice uses square feet (US/Canada) or square metres (everywhere else).
Worked example — a half-acre lot for a custom home: 0.5 acre = 21,780 ft² = 2,023 m². A 100 ft × 217.8 ft rectangle equals exactly 0.5 acres. For real estate marketing, half-acre lots are sometimes described as 'almost 22,000 square feet' or 'about 2,000 square metres' depending on which unit feels bigger to the buyer.
For comparison, a regulation American football field including end zones is 360 × 160 = 57,600 ft² = 1.32 acres = 0.535 hectare. A standard NYC city block is roughly 264 × 900 = 237,600 ft² = 5.45 acres = 2.21 hectares. A standard parking stall is 9 × 18 = 162 ft² (varies by jurisdiction). Use these as sense-checks; if your math says a one-acre lot fits seven football fields, recheck.
Common land parcel sizes
| Size | Common label | Notes |
|---|---|---|
| 100 ft² | ~9.3 m² | Single parking stall (compact) |
| 162 ft² | ~15 m² | Standard parking stall (9 × 18 ft) |
| 500 ft² | 46 m² | Studio apartment, mechanical room |
| 1,000 ft² | 93 m² | Small 1-bedroom apartment |
| 5,000 ft² | 465 m² | Small urban lot, ~1/9 acre |
| 7,500 ft² | 697 m² | Typical suburban lot (~0.17 acre) |
| 10,890 ft² | 1,012 m² | 1/4 acre |
| 21,780 ft² | 2,023 m² | 1/2 acre |
| 43,560 ft² | 4,047 m² | 1 acre = 0.405 hectare |
| 57,600 ft² | 5,351 m² | 1.32 acres = American football field |
| 107,639 ft² | 10,000 m² | 2.47 acres = 1 hectare |
| 237,600 ft² | 22,073 m² | 5.45 acres = NYC city block |
| 1 mi² | 2.59 km² | 640 acres = 1 section (US/Canadian land survey) |
Acres, hectares, and rule-of-thumb references
Rule of thumb: an acre is roughly the size of a football field — actually about 75 percent of one, since a regulation field is 1.32 acres. Or remember 'one acre fits roughly 250 parking spaces' (43,560 ÷ 162). For metric, a hectare is one square hectometre — 100 metres on a side — so you can pace one out in roughly 130 steps each direction.
For very large parcels, hectares become more practical than acres. A 100-hectare farm (247 acres) reads cleaner than 247 acres or 10,763,910 ft². For very small parcels, ft² or m² is best — saying 'a 5,000 ft² lot' is clearer than '0.115 acres'.
North American real estate listings usually quote lot size as 'X acres' for rural land and 'X square feet' for urban lots. Watch out for descriptions that mix units — 'half-acre, 21,000 sqft' is suspicious because half an acre is 21,780 sqft, not 21,000. Use this calculator to verify any size claim before signing.
Frequently asked questions
How big is an acre?
An acre is 43,560 square feet, which is a square about 209 feet on each side. In metric, it is 4,047 square metres, or roughly 0.4047 hectares. For a visual reference: an American football field including end zones (360 × 160 ft) is 1.32 acres, so a single acre is about three-quarters of a football field.
How many acres are in a hectare?
One hectare equals 2.4711 acres. The reverse: one acre equals 0.4047 hectares. The conversion factor comes from 1 acre = 4,046.86 m² and 1 hectare = 10,000 m², so 1 ha = 10,000 ÷ 4,046.86 = 2.4711 acres. A 100-hectare property is 247 acres.
How is acreage calculated from length and width?
Multiply length × width to get square feet (or square metres), then divide by 43,560 for acres (or by 4,047 for acres-from-metres, or by 10,000 for hectares). A 100 ft × 218 ft lot is 21,800 ft², which is 21,800 ÷ 43,560 = 0.5005 acres — about half an acre.
Can I use this for an irregular-shaped lot?
Not directly — this calculator assumes a rectangular parcel. For irregular shapes, split the lot into rectangles or triangles, calculate each separately (use the Floor Area Calculator for multi-rectangle sums, or the Triangle Calculator for triangular sections), and add the totals. For a legal survey description, work from the metes-and-bounds rather than estimating shapes.
What is a section in US/Canadian land survey?
A section is one square mile = 640 acres = 2.59 km². The US Public Land Survey System divides land into townships of 36 sections each (6 × 6 grid). Canada uses a similar Dominion Land Survey in the prairie provinces. A quarter-section is 160 acres — the historical homestead allotment under the 19th-century homestead acts in both countries.
Why does a "half-acre lot" sometimes list as 21,000 or 22,000 ft²?
Half of 43,560 is 21,780 — that is the precise number. Listings that round to 21,000 or 22,000 are usually marketing approximations or rounded from a slightly-non-rectangular lot whose actual area falls in that range. Anything in the 20,000–22,000 ft² range can fairly be called "half an acre"; outside that range, the language is misleading. Use this calculator on the listed dimensions to verify.