Spike's Calculators

Area and Perimeter


Spike VM

Calculate the area and perimeter of a square. This calculator uses feet and or inches for measurements.

Square = four equal sides and four 90° angles.


Square Area and Perimeter

Side Length ft in n
Decimal Precision


Length of Diagonal ft
Area of the Square:
Decimal Square Feet ft²
Square Feet ft² in²
Decimal Square Inches in²
Square Inches in²
Square Metres
Perimeter of the Square:
Decimal Feet ft
Feet ft in
Decimal Inches in
Inches in
Metres m


  1. the side length in feet and or inches
  2. decimal precision, the number of digits after the decimal point


  1. the length of the diagonal
  2. the area of the square in decimal square feet
  3. area in square feet and inches
  4. the area in decimal square inches
  5. the area in square inches
  6. the area in square metres
  7. the perimeter of the rectangle in decimal feet
  8. the perimeter in lineal feet and inches
  9. the perimeter in decimal inches
  10. the perimeter in inches
  11. the perimeter in metres
A = s²
P =  s4
where A is the area of the square
s the length of one of the sides
P  the perimeter of the square

one square foot ( ft²) = 144 square inches (in²)
one square inch (in²) = 0.00694444444444443 square feet (ft²)
one square foot ( ft²) = 0.09290304 square metres (m²)
square inch (in²) = 0.00064516 square metres (m²)
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