How Big Is 40 Acres?
40 acres is 1,742,400 square feet — a square about 1,320 feet per side, or roughly 30.3 football fields. Walking its perimeter takes about 20 minutes at 3 mph.
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Search your own address below and the map drops a 40-acre square on the satellite imagery — drag it anywhere to see exactly how much land it covers next to landmarks you know.
Drops a draggable 40-acre square on free satellite imagery
Area
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Drop at least 3 corners to see area and perimeter.
40 Acres to scale
Each side of a square 40 acres is 3.7 football-field lengths long, and the whole square holds 30.3 football fields, end zones included — the same area as 40 one-acre squares like the dashed outline.
40 Acres in every unit
| Unit | 40 Acres equals |
|---|---|
| Acres | 40 |
| Square feet | 1,742,400 |
| Square meters | 161,874 |
| Hectares | 16.19 |
| Square miles | 0.0625 |
| Football fields (incl. end zones) | 30.3 |
Typical dimensions of 40 acres
Acreage measures area, not shape. Every rectangle below encloses exactly 40 acres:
| Width (ft) | Length (ft) | Shape |
|---|---|---|
| 1,320 | 1,320 | A perfect square |
| 660 | 2,640 | A realistic rectangular parcel |
| 1,000 | 1,742.4 | A realistic rectangular parcel |
A square 40 acres is exactly 1,320 × 1,320 ft — the quarter-quarter section of the Public Land Survey System, the original American “forty.”
Real parcels are rarely perfect rectangles. To measure an actual property, trace its boundary corner by corner with the acreage calculator.
How much fence for 40 acres?
Fencing a square 40 acres takes about 5,280 ft of fence (1.00 miles). Stretch the same area into a 2:1 rectangle and the fence grows to about 5,600 ft — the longer and narrower a parcel, the more fence it needs for the same acreage. At 10-ft post spacing the square needs roughly 528 line posts before corners and gates; the fence calculator estimates materials for a real fence line once you trace it.
What can you do with 40 acres?
Forty acres is the historic American farm unit — the quarter-quarter section. It is enough land for a genuine small farm: tens of acres in crop or hay, pasture for a cow-calf handful, plus buildings and a woodlot.
As recreational land, a forty is the benchmark parcel in much of the rural U.S.: large enough to manage habitat, hold wildlife and hunt several ways, small enough for one owner to know every corner.
A forty usually comes with history you can read from above: old fence rows, field roads, drainage ditches and a farmstead site often show clearly on satellite imagery. Tracing them on a map is a quick way to see how much of the parcel is tillable, wooded or wet before you walk it.
Compare other sizes
Related tools and guides
Frequently asked questions
- How many square feet is 40 acres?
- 40 acres is 1,742,400 square feet (40 × 43,560 sq ft per acre). In metric units that is 161,874 square meters, or 16.19 hectares. The conversion table on this page lists every common unit.
- How many football fields is 40 acres?
- 40 acres is about 30.3 American football fields, counting the end zones — each full field covers 57,600 square feet, or 1.32 acres. Football fields are one of the most reliable mental yardsticks because almost everyone has stood on one.
- What are the dimensions of 40 acres?
- 40 acres has no fixed shape — any boundary enclosing 1,742,400 square feet qualifies. A perfect square would measure about 1,320 × 1,320 feet. Real parcels are usually rectangles or irregular shapes, so the dimensions table on this page shows several realistic layouts with the same area.
- How long does it take to walk 40 acres?
- Walking the perimeter of a square 40 acres — about 1.00 miles — takes roughly 20 minutes at a normal 3 mph pace (20 minutes per mile). Irregular or brushy parcels take longer, which is worth knowing before you walk a property line with an agent.
- Why is 40 acres called a quarter-quarter section?
- In the Public Land Survey System a section is one square mile, or 640 acres. Quartering it gives four 160-acre quarter sections, and quartering one of those gives four 40-acre quarter-quarters — each a 1,320 ft square on the survey grid. That is why so many rural deeds, plat maps and land listings in the central and western U.S. come in multiples of 40 acres.
Sources
- NIST — Revised Unit Conversion Factors (U.S. survey foot) — 1 acre = 43,560 sq ft = 10 square chains = 4,046.86 m².
- NFL Rulebook, Rule 1 — The Field — A football field is 360 × 160 ft including both end zones.
- Public Land Survey System (Wikipedia) — A section is 1 square mile (640 acres); a quarter-quarter section is 40 acres.