Acreage Calculator — Acres, Square Feet, Square Yards, Hectares, Square Meters and 2026 Land / Service Cost
This acreage calculator converts any land parcel into acres, ft², yd², hectares, and m² in one calculation — with presets for the historic surveyor’s acre (66 ft × 660 ft Gunter chain × furlong) and 2026 cost defaults for mowing, bush hog, and raw rural land. Tied to the NIST conversion 1 acre = 43,560 ft² = 4,046.86 m² exactly.
Acreage Calculator
Enter project dimensions below — results update instantly. Switch units freely.
Estimates assume typical industry density and waste factors. Always verify with your supplier and local building code before purchasing material.
Why 1 Acre = 43,560 ft² (and Where That Strange Number Comes From)
One acre is exactly 43,560 ft². The constant looks arbitrary until you know its history: an acre is 1 chain (66 ft) wide by 1 furlong (660 ft) long — the area a pair of oxen could plough in one day. 66 × 660 = 43,560 ft², and the surveyor’s Gunter chain (invented 1620) has used those proportions ever since.
That history creates four equally valid acre shapes that all surveyors see in the field:
- Square acre — 208.71 ft × 208.71 ft (√43,560). The shape developers slice modern subdivisions into.
- Gunter chain acre — 66 ft × 660 ft (1 chain × 1 furlong). The shape on old survey deeds and the section/township grid.
- Strip acre — 33 ft × 1,320 ft (1/2 chain × 2 furlongs). Common on long rural road frontages.
- Random-shape parcel — the irregular polygon every actual deed describes after 200 years of subdivision.
Three places acre estimates go wrong:
- Confusing acres with hectares. 1 hectare = 2.471 acres (or 1 acre = 0.4047 ha). Reading a metric soil-test report or international land listing without converting throws every per-acre rate off by 2.47×.
- Mixing up acres with ‘square acres’. There’s no such unit as a ‘square acre’ — an acre is already a unit of area. The confusion arises because people picture a square parcel and want to compute its side length: 1 acre square = 208.71 ft per side.
- Per-acre service pricing. 2026 mowing $35–$65/ac (residential property); bush-hog $90–$145/ac (rural overgrown); raw rural land $3,000–$8,000/ac (varies 10× by region). The calculator above multiplies acres by your $/ac to compute a quick total — useful for budgeting before a property visit.
How to Calculate Acreage Calculator
Hectares = acres × 0.4046856422
m² = ft² × 0.09290304
All three constants are exact per NIST SP 811. 43,560 ft² / acre comes from 66 ft × 660 ft; 0.09290304 m² / ft² comes from (0.3048 m / ft)²; 0.4046856422 ha / acre is 43,560 × 0.09290304 / 10,000. The calculator above carries these constants to full precision so the round-trip ft² → acres → m² → hectares is lossless to 6 decimals.
Common Acre Shapes & Side Lengths
| Shape | Dimensions (ft) | Where you see it |
|---|---|---|
| Perfect square | 208.71 × 208.71 | Modern subdivision lots |
| Gunter chain rectangle | 66 × 660 (1 chain × 1 furlong) | 1872 General Land Office survey grid |
| Football-field comparison | 360 × 121 (approximately) | An NFL field is 1.32 acres (360 × 160 ft incl. end zones) |
| Half-mile road frontage | 16.5 × 2,640 (1 rod × 1/2 mile) | Long-and-narrow rural road parcel |
| Quarter-mile road frontage | 33 × 1,320 (2 rods × 1/4 mile) | Common rural agricultural strip |
| City block-ish | 200 × 218 | Urban / suburban block parcel |
Memorized Conversion Constants (NIST SP 811)
- 1 acre = 43,560 ft²
- 1 acre = 4,840 yd²
- 1 acre = 4,046.8564224 m²
- 1 acre = 0.4046856422 hectare
- 1 hectare = 2.4710538147 acres
- 640 acres = 1 sq mile (Section)
- 1 sq mile = 27,878,400 ft²
2026 Per-Acre Service & Land Cost (Mid-Atlantic Baseline)
| Service / Asset | $/Acre | Notes |
|---|---|---|
| Residential lawn mowing | $35–$65 | Per cut, typical 0.25–1 acre lots, includes trimming |
| Bush hog / rotary cutter (weekly overgrowth) | $60–$95 | 2-ft tall grass, accessible terrain |
| Bush hog (heavy, 4-ft+ growth or saplings) | $110–$175 | First cut after multi-year neglect |
| Hay baling (round bales) | $25–$45 | Per acre cut; producer keeps hay value |
| Land clearing (light brush) | $1,500–$3,500 | Dozer / skid steer + haul-off |
| Land clearing (forest, mature trees) | $5,000–$12,500 | Full forestry mulcher or selective harvest |
| Raw rural land (Mid-Atlantic, 5+ ac parcel) | $4,000–$8,500 | Untilled, no utilities; varies wildly by region |
| Subdivided residential lot (1/4–1 acre) | $25,000–$150,000 | Per acre equivalent on small lots is misleading; lot pricing dominates |
| Mid-Atlantic farmland (good soil) | $8,000–$16,000 | USDA NASS Land Values 2025: VA / MD / DE / NJ average |
For sub-acre projects, the Square Footage Calculator stays in ft² without the 43,560 conversion. For volume-from-area work (excavation, topsoil), use the Cubic Yard Calculator. For lumber and BF math, the Board Foot Calculator.
What Most Online Calculators Get Wrong Reviewed by Ethan Walker, Senior Asphalt Estimator & Paving Consultant (22 yrs)
The default AI answer to “how many acres is X square feet?” is sqft ÷ 43,560. That's correct for rectangular lots in flat country, and wrong for the four scenarios below — which describe most real-world parcels. Knowing where the simple formula breaks is the difference between a clean closing and a 6–12% surveyor correction at title:
- Flat-plan acreage on sloped land. The 43,560 ft² / acre constant is the plan-projected area (looking straight down). On a 25% slope, the surface area is ~3.1% larger than the plan area; on a 50% slope, ~11.8% larger. AI calculators output plan acreage and call it done. Tell: county tax assessors use plan acreage (this is correct); useful acreage for grazing or planting is surface acreage. For accurate surface-area calcs, multiply plan area by sec(slope angle).
- Irregular polygons treated as rectangles. Most parcels aren't rectangles — they have 5–12 vertices following old field boundaries, streams, or road curves. Default AI calculators ask for ‘length × width’ and let you input one number for each. Result: 8–15% error on the typical L-shape or trapezoidal parcel. The correct method is the surveyor's shoelace formula (sum of cross-products of vertex coordinates ÷ 2), or the Bing/Google polygon-draw tool for rough estimates. This calculator accepts polygon vertices, not just length × width.
- Right-of-way / easement deduction missed. Public-road right-of-way (typically 25–33 ft from centerline on each side) is part of the parcel but not part of the usable lot. AI calculators output gross parcel acreage; building setbacks, septic reserve, and utility easements then further reduce the buildable area by 15–35%. Result: a ‘1.2-acre lot’ might have only 0.78 buildable acres. Always subtract right-of-way and easement strips before treating acreage as buildable.
- Confusing ‘acre’ (43,560 ft²) with ‘square acre’ (209 ft per side). 1 acre = 43,560 ft² but a square acre is 208.71 ft per side (√43,560). Many AI tools, when asked ‘how many feet in an acre,’ confidently answer 43,560 ft — conflating ft² with ft. Tell: any AI answer that says ‘an acre is 43,560 feet’ without the squared unit is wrong; it's 43,560 square feet or 208.71 feet per side on a square parcel.
This calculator outputs plan-projected acres (the legal-record number) along with optional slope correction for surface acreage, accepts polygon vertices for irregular parcels (not just rectangle L × W), and shows the difference between gross parcel acreage and post-deduction usable acreage. The decisions that matter happen before dividing by 43,560.
Acreage Coverage Table and Material Reference
| Lot dimensions | ft² | Acres | Hectares | Common use |
|---|---|---|---|---|
| 60 × 100 | 6,000 | 0.138 | 0.056 | Urban townhome lot |
| 80 × 120 | 9,600 | 0.220 | 0.089 | Small suburban lot |
| 100 × 150 | 15,000 | 0.344 | 0.139 | Typical 1980s suburban |
| 120 × 180 | 21,600 | 0.496 | 0.201 | Half-acre suburban |
| 150 × 290 | 43,500 | 0.999 | 0.404 | 1-acre lot (essentially) |
| 208.71 × 208.71 | 43,560 | 1.000 | 0.405 | Exact 1-acre square |
| 330 × 660 | 217,800 | 5.000 | 2.023 | 5-acre rural lot |
| 660 × 660 | 435,600 | 10.000 | 4.047 | 10-acre rural parcel |
| 1,320 × 2,640 | 3,484,800 | 80.000 | 32.375 | Quarter-section (80 acres) |
| 5,280 × 5,280 | 27,878,400 | 640.000 | 258.999 | Full section (1 sq mile) |
All dimensions assume a rectangular parcel for simplicity. Actual deeds describe irregular polygons via metes-and-bounds or coordinate geometry; survey area calculation is the source of truth.
| Acres | ft² | yd² | m² | Hectares |
|---|---|---|---|---|
| 0.25 ac (1/4) | 10,890 | 1,210 | 1,012 | 0.101 |
| 0.5 ac (1/2) | 21,780 | 2,420 | 2,023 | 0.202 |
| 1 ac | 43,560 | 4,840 | 4,047 | 0.405 |
| 2 ac | 87,120 | 9,680 | 8,094 | 0.809 |
| 5 ac | 217,800 | 24,200 | 20,234 | 2.023 |
| 10 ac | 435,600 | 48,400 | 40,469 | 4.047 |
| 40 ac | 1,742,400 | 193,600 | 161,875 | 16.187 |
| 160 ac (1/4 section) | 6,969,600 | 774,400 | 647,497 | 64.750 |
| 640 ac (1 section) | 27,878,400 | 3,097,600 | 2,589,988 | 258.999 |
Memorize the 1-acre row; everything else multiplies linearly.
Real-World Example Calculations
Suburban Lot 80 ft × 120 ft
Typical 1990s-era suburban building lot; computing acreage for mowing service quote.
- L × W
- 120 ft × 80 ft
- Service rate
- $45/acre lawn mowing
Takeaway: Far below the typical $35 per-cut minimum; mowing service will charge their minimum, not the per-acre rate. Useful for budgeting bush-hog on rural lots only.
Rural Land Parcel 660 ft × 660 ft
10-acre square parcel for hobby farm; computing raw-land cost at $4,500/acre.
- L × W
- 660 ft × 660 ft
- $/acre
- $4,500 (raw rural)
Takeaway: 10 acres = 4.047 hectares for international comparison. Bush-hogging the whole parcel annually at $95/ac runs $950/year if accessible.
Section Quarter (1320 ft × 1320 ft)
Quarter-section (40 acres) on the General Land Office survey grid — common rural deed unit.
- L × W
- 1,320 ft × 1,320 ft
- $/acre
- $8,500 (good Midwest farmland)
Takeaway: 1 quarter-section = 40 acres = 16.19 hectares. The PLSS section grid built the entire western US property system; almost every Midwest rural deed describes parcels in fractions of sections (40, 80, 160 acres).
Sources & Standards
These references are used for terminology, safety boundaries, and engineering assumptions. Local code, supplier specifications, and licensed design documents still control your project.
-
NIST Special Publication 811 — Guide for the Use of the International System of Units (SI)
National Institute of Standards and Technology
Referenced for exact unit-conversion constants: 1 acre = 4,046.8564224 m² (exact); 1 ft = 0.3048 m (exact); 1 ft² = 0.09290304 m² (exact).
-
US Public Land Survey System (PLSS) Manual
Bureau of Land Management
Referenced for the Section / Township / Range grid used in 30 western US states (1 section = 1 sq mile = 640 acres; quarter section = 160 acres).
-
USDA NASS Land Values 2025 Summary
USDA National Agricultural Statistics Service
Referenced for 2025 state-by-state cropland and pastureland $/acre values; basis for the 2026 estimates in the per-acre cost table above.
-
ALTA/NSPS Land Title Survey Standards (2021)
American Land Title Association + National Society of Professional Surveyors
Referenced for the boundary-survey standard used in closing-grade acreage determination (relative positional precision ± 0.07 ft + 50 ppm), and the shoelace polygon-area formula used for irregular parcel computation in this calculator.
-
FGDC-STD-007.3 — National Standard for Spatial Data Accuracy
Federal Geographic Data Committee
Referenced for the GPS-grade vs survey-grade acreage accuracy comparison (consumer GPS ± 3-5 ft = 1-3% acreage error on a 1-acre parcel; survey grade ± 0.1 ft = essentially zero error), used in the ‘why your phone GPS doesn't agree with the title’ explanation.
Frequently Asked Questions
How many square feet are in an acre?
43,560 ft². This comes from the historic surveyor’s acre: 1 Gunter chain (66 ft) × 1 furlong (660 ft) = 43,560 ft². Memorize this constant; it underlies every per-acre conversion.
What size is a 1 acre square lot?
208.71 ft × 208.71 ft (the square root of 43,560). Useful for picturing acreage: about half the length of an NFL football field on each side, or roughly the size of a square city block in a modern subdivision.
How do I convert acres to hectares?
Multiply by 0.4047 (or divide by 2.471). Example: 5 acres × 0.4047 = 2.024 hectares. Going the other way: 1 hectare = 2.471 acres. Both conversion factors are NIST-exact to many decimal places.
How many acres in a square mile?
640 acres. This is the basis of the US Public Land Survey System (PLSS) Section: 1 mi × 1 mi = 640 ac. A quarter section is 160 acres; an aliquot 1/16 section is 40 acres — the unit most rural deeds use.
How big is an acre compared to a football field?
An NFL regulation football field (including both end zones, 360 ft × 160 ft = 57,600 ft²) is 1.32 acres. So 1 acre is about 76% the size of a US football field. A soccer pitch (FIFA standard 105 m × 68 m = 7,140 m²) is 1.76 acres.
How much does it cost to mow an acre in 2026?
Per-cut residential rates: $35–$65/acre for established turf. Bush-hogging (overgrown grass / brush): $60–$95/acre normal; $110–$175/acre for heavy 4-ft+ growth after multi-year neglect. Most services have a minimum charge of $35–$50 regardless of small lot size.
How much is an acre of land worth?
Wildly variable by region. 2026 estimates: raw rural Mid-Atlantic $4,000–$8,500/acre; good Midwest farmland $8,000–$16,000/acre; subdivided suburban lots $25,000–$150,000/acre equivalent; urban infill lots $300,000+/acre equivalent. USDA NASS publishes annual state-by-state Land Values Bulletin.