Square Footage Calculators — all 9

Rectangle

Length

Width

Calculate Clear

Rectangle Border (area of frame)

Provide outer dimensions and border width (border removed equally on all sides)

Outer Length

Outer Width

Border Width (along each edge)

Calculate Clear

Circle

Radius

Calculate Clear

Ring (Annulus)

Outer Radius (R)

Inner Radius (r)

Calculate Clear

Triangle — Edge Lengths (Heron's)

Edge a

Edge b

Edge c

Calculate Clear

Triangle — Base & Height

Base

Height

Calculate Clear

Trapezoid

Base 1 (b1)

Base 2 (b2)

Height (h)

Leg 1 (optional — for perimeter)

Leg 2 (optional — for perimeter)

Calculate Clear

Sector

Radius (r)

Angle (degrees)

Calculate Clear

Parallelogram

Base (b)

Height (h)

Side length (optional — for perimeter)

Calculate Clear