Construction Calculators

Free construction calculators for materials and measurements: concrete, lumber, roofing, stairs, and more, in metric and imperial units.

11 calculators

• Stair Calculator

  Find the number of steps, riser height, total run, and stringer length.

• Cubic Yard Calculator

  Find how many cubic yards of concrete, dirt, or fill you need, with cost.

• Cubic Feet Calculator

  Find the volume of a box, room, or load in cubic feet from any units.

• Board Foot Calculator

  Find the board feet of lumber and its cost from the board sizes.

• Roofing Calculator

  Estimate roof area, roofing squares, and shingle bundles from the house size.

• Roof Pitch Calculator

  Convert roof pitch between x/12, degrees, and percent, or find it from rise and run.

• Pool Volume Calculator

  Find how many gallons or liters of water your pool holds.

• Soil Calculator

  Find how much soil you need for raised beds, in cubic yards and bags.

• Drywall Calculator

  Find how many drywall sheets you need for a room, minus doors and windows.

• Voltage Drop Calculator

  Estimate the voltage drop in copper or aluminum wire by size, length, and current.

• Ohm's Law Calculator

  Enter any two of voltage, current, resistance, and power to find the others.