Free Tools
Free construction calculators
Quick answers for the numbers you work out all the time. Each one runs in your browser, and nothing you type is saved or sent.
Volume
Concrete Calculator
Free concrete calculator for slabs, footings, walls and round columns. Enter the sizes, get cubic yards with a waste allowance. Nothing is saved or sent.
Pricing
Markup vs. Margin Calculator
Free markup and margin calculator. Enter your cost and either a markup, a margin or a selling price, and see all of them side by side. Nothing is saved or sent.
Electrical
Wire Pull Tension Calculator
Free wire and cable pulling tension calculator. Enter the weight, the friction and each straight run and bend, and see the tension and sidewall pressure at every step. Nothing is saved or sent.
Finishes
Drywall Calculator
Free drywall calculator. Enter wall length, height, ceiling area and openings, pick the sheet size, and get the number of sheets with a waste allowance. Nothing is saved or sent.
Electrical
Voltage Drop Calculator
Free voltage drop calculator. Choose the wire size and material, enter the current and one-way length, and see the drop in volts and percent. Nothing is saved or sent.