Square Feet to Acres Converter

The formula

1 acre = 43,560 square feet — a figure fixed by historical English land-measurement law (an acre is defined as 1 chain × 1 furlong, which works out to that exact square-foot count). The tool divides your input by 43,560 and rounds to six decimal places, since an acre is large enough that typical lot sizes convert to small fractional values. Enter 10000 and it returns 10000 square feet = 0.229568 acres.

Why six decimal places

A single square foot is only 0.000023 of an acre, so fewer decimal places would round small residential lots down to 0.00 or 0.23 with no useful distinction between, say, a 9,000 sqft and 11,000 sqft lot. Six decimals keeps roughly 1 sqft of resolution.

Reference values