Acreage Calculator
A 66 ft by 660 ft lot is 43,560.00 square feet, 4,046.86 square meters, 1.0000 acres, and 0.4047 hectares.
Last updated . Rectangle is selected, at 66 ft by 660 ft. Acre and hectare lines use four decimal places. One acre is 43,560 square feet, and one hectare is 10,000 square meters.
An acreage calculator for a lot: rectangle, triangle, circle, or four sides plus the diagonal that splits them into two triangles. You can also type square feet or square meters.
Adding and subtracting shapes in square feet, without acres: square footage calculator. A slab from that area: concrete slab calculator.
Lot size to acres
Walk the boundary in order. Side 1 and side 2 form one triangle with the diagonal. Side 3 and side 4 form the other. The diagonal joins the corner between side 4 and side 1 to the corner between side 2 and side 3.
One acre is 43,560 square feet. One hectare is 10,000 square meters. One square foot is 0.09290304 square meters. Adding and subtracting shapes in square feet, without acres, is the square footage page.
Results
How acres are calculated
Convert each side to meters, find the area in square meters, then divide by 0.09290304 to get square feet. Acres = square feet ÷ 43,560. Hectares = square meters ÷ 10,000. One square foot is 0.09290304 square meters because one foot is 0.3048 meters. A 66 ft by 660 ft rectangle is one acre exactly: 66 × 660 = 43,560.
Square feet and square meters display two decimals. Acres and hectares display four, so one acre reads 1.0000 and one hectare reads 1.0000. One acre is 0.40468564224 hectares, which rounds to 0.4047.
The single triangle uses ½ × base × height, and the height is perpendicular to the base. The circle uses π × (diameter ÷ 2)². A four-sided lot is split by the diagonal you measure. One triangle is side 1, side 2, and the diagonal. The other is side 3, side 4, and the same diagonal. For sides a, b, and c, the semi-perimeter is s = (a + b + c) ÷ 2 and the area is √[s(s − a)(s − b)(s − c)]. The lot area is the sum. If a + b is not greater than c for either triangle, or any length is zero, the panel shows an error and leaves the area blank.
Lot sizes
Change the shape menu. The other shapes are already filled with these sizes.
| Lot | ft² | m² | Acres | Hectares |
|---|---|---|---|---|
| 66 × 660 ft rectangle | 43,560.00 | 4,046.86 | 1.0000 | 0.4047 |
| 200 × 100 ft rectangle | 20,000.00 | 1,858.06 | 0.4591 | 0.1858 |
| Triangle, base 200 ft, height 100 ft | 10,000.00 | 929.03 | 0.2296 | 0.0929 |
| Circle, diameter 100 ft | 7,853.98 | 729.66 | 0.1803 | 0.0730 |
| Sides 60, 80, 100, 120 ft, diagonal 100 ft | 7,200.00 | 668.90 | 0.1653 | 0.0669 |
| 10,000 m² typed in | 107,639.10 | 10,000.00 | 2.4711 | 1.0000 |
Worked example
Leave the rectangle at 66 ft by 660 ft. Square feet reads 43,560.00. Square meters reads 4,046.86. Acres reads 1.0000. Hectares reads 0.4047.
Irregular lot
Choose Irregular, 4 sides and a diagonal, and leave 60 ft, 80 ft, 100 ft, 120 ft, and a 100 ft diagonal. The first triangle is 60, 80, and 100. That is a 3-4-5 right triangle enlarged by 20, and ½ × 60 × 80 = 2,400 square feet. The second triangle is 100, 120, and 100. Its semi-perimeter is (100 + 120 + 100) ÷ 2 = 160, and √[160 × 60 × 40 × 60] = 4,800 square feet. Added, the lot is 7,200.00 square feet, 668.90 square meters, 0.1653 acres, and 0.0669 hectares. 7,200 ÷ 43,560 = 0.165289…, which rounds to 0.1653.
Acreage questions
How many acres is 66 feet by 660 feet?
Leave the shape on Rectangle, length 66 ft, and width 660 ft. Square feet reads 43,560.00. Square meters reads 4,046.86. Acres reads 1.0000. Hectares reads 0.4047. An acre is 43,560 square feet, and 66 × 660 is that number.
How do I turn a 200 by 100 foot lot into acres?
Set length to 200 ft and width to 100 ft. Square feet reads 20,000.00. Square meters reads 1,858.06. Acres reads 0.4591. Hectares reads 0.1858. Acres = 20,000 ÷ 43,560.
How many acres is a triangle with a 200 foot base and a 100 foot height?
Choose Triangle. Base stays 200 ft and height stays 100 ft. Square feet reads 10,000.00. Square meters reads 929.03. Acres reads 0.2296. Hectares reads 0.0929. The area is ½ × 200 × 100. The height is perpendicular to the base.
How many acres is a circle 100 feet across?
Choose Circle. Diameter stays 100 ft. Square feet reads 7,853.98. Square meters reads 729.66. Acres reads 0.1803. Hectares reads 0.0730. The area is π × 50².
How many acres is a 4-sided lot with a 100 foot diagonal?
Choose Irregular, 4 sides and a diagonal. Side 1 stays 60 ft, side 2 stays 80 ft, side 3 stays 100 ft, side 4 stays 120 ft, and the diagonal stays 100 ft. Square feet reads 7,200.00. Square meters reads 668.90. Acres reads 0.1653. Hectares reads 0.0669. Side 1, side 2, and the diagonal are a 60-80-100 triangle, a 3-4-5 triangle scaled by 20, so its area is 2,400 square feet. Side 3, side 4, and the diagonal are 100, 120, and 100. Their semi-perimeter is 160, and Heron's formula gives 4,800 square feet. The lot is 2,400 + 4,800.
What happens if the sides cannot form a triangle?
Choose Irregular, 4 sides and a diagonal. Set side 1 to 60 ft, side 2 to 80 ft, side 3 to 50 ft, side 4 to 50 ft, and the diagonal to 10 ft. Square feet, square meters, acres, and hectares each read —. The message reads: Side 1, side 2, and the diagonal cannot form a triangle. Each pair must add up to more than the third side. Here 60 + 10 is not greater than 80. Side 3, side 4, and the 10 ft diagonal do form a triangle, so only the first message appears.
How many acres is 10,000 square meters?
Choose Square feet or square meters. Set the area to 10000 and the unit to m². Square feet reads 107,639.10. Square meters reads 10,000.00. Acres reads 2.4711. Hectares reads 1.0000. One hectare is 10,000 square meters.
Is this the square footage calculator?
No. This page turns one lot into acres and hectares. It does not add and subtract several shapes. Adding a rectangle, a triangle, a circle, and an L-shape in square feet is the square footage calculator.