Measurements & Conversions

Acreage Calculator

Convert a plot's length and width into acres, hectares and square feet for land, site and agricultural work.

  • Answers as you type
  • Every formula cited
  • Calculated in your browser
SettingsSettings for this calculationUS
Market
Imperial · sales tax
The long side of the plot.

For a plot that is not rectangular, this multiplication will over-read. Split it into rectangles and triangles, or take the figure from a title plan, which will state the area directly.

The short side of the plot.

This calculation assumes a rectangle, and plots very seldom are one. For an irregular boundary, split it into rectangles and triangles and add them — a single bounding measurement describes a box that includes land belonging to someone else. Where a boundary runs along a road or a watercourse, the titled line and the fence line are often not the same, and it is the title that is being measured.

Plot area

1.97 acres

High confidence

Exact for a rectangle. A plot with any other shape needs a survey figure or a decomposition into simple shapes.

Hectares
1.97 acres
Square metres
7,971.08 m²
Square feet
85,800 sq ft
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • 1 international acre = 4046.8564224 m² exactly, from the 1959 international yard
  • 1 hectare = 10,000 m² exactly (SI derived)

Inputs used

Length
330 ft
Width
260 ft

Intermediate steps

Hectares
1.97 acres
Square metres
7,971.08 m²
Square feet
85,800 sq ft
Final result1.97 acres

Confidence note: Exact for a rectangle. A plot with any other shape needs a survey figure or a decomposition into simple shapes.

What this calculation does not cover

  • Length times width returns the horizontal plan area, and nothing in the calculation asks about fall. A tape run down a 1-in-5 slope measures about two per cent longer than the horizontal distance it covers, so ground paced out across a hillside reads high against the plan area a title or planning drawing quotes — while seed, turf and spray, which cover the ground surface rather than its shadow, need about that much more than the acreage implies.
  • Where the tape was laid decides the answer, and the two numbers entered carry no record of it. Taking each boundary half a metre further out — hedge centre rather than fence face, far bank of the ditch rather than near — turns a 100 by 80 m (262 ft) plot into 101 by 81 m (266 ft) and adds 181 m², a little over 0.045 acre, with nothing on the page looking any different.
  • Only an area comes back, never a boundary length, so fencing, hedging, stock netting and perimeter drainage do not follow from it. A 200 by 40 m strip and an 89.4 m square both work out at 1.98 acres, yet the strip needs 480 m of fence line against the square's 358.
  • The hectares, square metres and square feet sit underneath as the same product re-expressed, not as four independent estimates. They agree with one another by construction, so a mistyped side or a boundary read off the wrong line runs through all of them identically and cannot be caught by checking one figure against the next.
  • Confidence is returned as high for any pair of sides inside the field range, whether they came off a registered title plan or off a stride count, and the headline is then printed to four significant figures — 1.977 acres for that 100 by 80 m (262 ft) plot. Half a metre of doubt on the 80 m (262 ft) side is worth 0.012 acre by itself, which already lands in the third figure, so the fourth is arithmetic rather than survey.
  • Each side is authored to run from 0 to 20,000 metres (0.00 to 65,617 ft) in the site's base units, and an entry past that still computes: the range check downgrades the confidence and says so rather than blocking the number. Anything at that scale, or a holding made of several parcels, wants to be split into rectangles and the acreages added.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

330 ft100.58 m260 ft79.25 m85,800 sq ft7,971.08 m²100 ft20 m

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-05 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations2
  1. 1 international acre = 4046.8564224 m² exactly, from the 1959 international yard
  2. 1 hectare = 10,000 m² exactly (SI derived)
Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

How to calculate acreage in 3 steps

  1. LengthThe long side of the plot.
  2. WidthThe short side of the plot.
  3. Plot areaThe tool computes the plot area from those figures and shows the formula, its sources, and a confidence rating alongside it.

Plot area by length

Page defaults, not your figures above.

LengthPlot area (acres)
200 ft1.21
300 ft1.81
400 ft2.41
500 ft3.01
600 ft3.62

Frequently asked questions

How big is an acre, really?
43,560 sq ft, or 4046.86 m². The traditional definition is a chain by a furlong — the area a yoke of oxen could plough in a day — which is why it is not a round number in any modern unit. A square acre is about 208.7 ft on a side.
Acres or hectares?
Acres in the United States and, informally, in the UK and Ireland for land. Hectares everywhere metric, including in Australian and Canadian official use. A hectare is about 2.47 acres, so they are not interchangeable at a glance.
My plot is not a rectangle. What now?
Split it into rectangles and right-angled triangles, work out each, and add. Multiplying an average length by an average width over-reads on almost any irregular plot, sometimes badly. For anything being bought, sold or built on, use the surveyed area from the title.
Is a US acre the same as a UK acre?
Yes, since 1959 — both use the international acre of 4046.8564224 m². The older US survey acre differs by about two parts in a million, which matters for federal land records and for nothing else.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.