Acreage Calculator
One acre is 43,560 square feet — a square about 208.7 ft per side. To calculate acreage, multiply length × width in feet and divide by 43,560, or skip the math: draw your property on the satellite map below and read the acres instantly.
How to calculate acreage
There are two ways to measure acres, and this page — an acreage calculator and acre calculator in one — handles both:
- Draw it on the map (any shape). Search your address, then tap a corner point at each bend of the boundary. After three points the acreage updates live as you add or drag corners. This is the only method that works for the irregular parcels most rural properties actually are — and you can cut out ponds or building sites for net acres.
- Length × width ÷ 43,560 (rectangles only). Multiply the two sides in feet to get square feet, then divide by 43,560. A 660 × 660 ft field is 435,600 sq ft — exactly 10 acres.
Drawn measurements on clear imagery typically land within 1–2% of a professional survey for parcels over an acre — accurate enough for seeding, fertilizing, leasing, and planning, though not a substitute for a licensed survey on legal matters.
Dimensions to acres
Common parcel dimensions and the acreage they work out to. All figures use the exact 43,560 sq ft per acre definition.
| Dimensions (ft) | Square feet | Acres | What that looks like |
|---|---|---|---|
| 208.71 × 208.71 | 43,560 | 1.00 | A square acre |
| 660 × 66 | 43,560 | 1.00 | 1 furlong × 1 chain — the original surveyed acre |
| 435.60 × 100 | 43,560 | 1.00 | A long, narrow one-acre strip |
| 100 × 100 | 10,000 | 0.23 | A large residential lot |
| 150 × 150 | 22,500 | 0.52 | Roughly a half-acre parcel |
| 200 × 200 | 40,000 | 0.92 | Just under an acre |
| 300 × 300 | 90,000 | 2.07 | A small hobby-farm field |
| 660 × 660 | 435,600 | 10.00 | 10 acres — a common rural parcel |
| 1,320 × 1,320 | 1,742,400 | 40.00 | 40 acres — a quarter-quarter section |
Acreage reference table
What common acreages measure in square feet, and the side length of an equivalent square parcel.
| Acres | Square feet | Square parcel (ft per side) |
|---|---|---|
| 0.25 ac | 10,890 | 104.4 × 104.4 |
| 0.5 ac | 21,780 | 147.6 × 147.6 |
| 1 ac | 43,560 | 208.7 × 208.7 |
| 2 ac | 87,120 | 295.2 × 295.2 |
| 5 ac | 217,800 | 466.7 × 466.7 |
| 10 ac | 435,600 | 660.0 × 660.0 |
Real parcels are rarely square — see how big an acre is for realistic shapes and visual comparisons, or measure your own boundary above for the real number.
Related tools
Frequently asked questions
- How do you calculate acreage from dimensions?
- Multiply length by width in feet to get square feet, then divide by 43,560. For example, a 300 × 300 ft parcel is 90,000 square feet, which works out to about 2.07 acres. This only works for rectangles — for an irregular parcel, trace its actual corners on the satellite map above and the tool computes the exact acreage for any shape.
- How many acres is my property?
- Outline your property boundary on the satellite map above and the acreage appears instantly — no deed or survey needed for a solid estimate. Place a corner point at each bend of the boundary and drag points to refine them against visible features like fence lines and tree rows. For the official recorded acreage, check your county assessor's parcel records.
- How do I calculate acreage on Google Maps?
- Google Maps can only measure straight-line distance — it has no area measurement on the web or in its mobile app. The usual workaround is desktop Google Earth, where you draw a polygon and dig the area out of its properties panel. The tool on this page skips all of that: tap the corners of your parcel on satellite imagery and read the acreage immediately, on any device.
- How many football fields is an acre?
- An acre is about 0.76 of a football field including the end zones — roughly three-quarters of the field. Flipped around, a full football field is about 1.32 acres. It's one of the most useful mental anchors for judging acreage at a glance.