Enter each piece of your lawn as a simple shape, tag it add (lawn) or subtract (a bed, driveway, patio, or pool), and we sum them into one net total. The four-unit line is computed from the unrounded net, so the number drops straight into per-1,000-sq-ft or per-acre product math.

rectangle  = l × w
triangle   = (base × height) / 2
circle     = π × r²            (π = 3.14159)
semicircle = (π × r²) / 2
oval       = l × w × 0.8       (Clemson homeowner factor)

curved-area helpers:
  offset (strip)   = mean(widths) × run length
  average-radius   = π × mean(radii)²

aggregate:
  added       = Σ area where op = add
  subtracted  = Σ area where op = subtract
  net         = max(0, added − subtracted)

conversions (from the unrounded net):
  sq yd  = net / 9
  acres  = net / 43,560
  m²     = net / 10.7639

Primitive and curve formulas follow Clemson HGIC's Measuring the Area of a Home Lawn; the multi-shape sum with cut-out subtraction follows Sod Solutions. Clemson prints π as 3.14 (a homeowner rounding) — we use the more precise 3.14159, which still reproduces the cited totals at whole square feet. The 0.8 oval factor is Clemson's homeowner approximation, not the exact ellipse. 1 acre = 43,560 sq ft is the standard US unit definition. No address, map, or satellite image is used.

A measured area is the first line of almost every lawn quote. The recurring side starts with the mowing rate a property of this size supports, the paperwork the customer actually reads comes from a mowing estimate with the scope written out, and a renovation priced off the same square footage belongs on what to charge to lay new sod.

Lawn Area Calculator

Sources