Free Construction Tools & Calculators

Get the exact anchor type, diameter, drill bit size, and embedment depth for your project. Answer 6 plain-English questions — get a complete anchor spec in seconds.

Compute tensile and shear capacity for concrete anchors per ACI 318-19 Chapter 17. Steel failure, concrete breakout, live utilization check. Imperial and metric.

Describe your project and get a complete tool list, materials list, step-by-step plan, and common mistakes to avoid. Built for contractors and serious DIYers.

Calculate riser height, tread depth, number of steps, and stringer length from your total rise. IRC code compliance check included. Imperial and metric.

Calculate exactly how many bags you need for slabs, footings, post holes, and round slabs. All bag sizes (25-80 lb), waste factor, ready-mix alert, CA and US pricing.

Calculate post hole depth, concrete bags, and cure time with frost depth data for 60+ cities across Canada and the US. Fence posts, deck posts, and more.

Find the exact drill bit type and size for concrete, metal, wood, tile, glass, and more. Includes anchor pilot hole sizes for Tapcon, wedge, sleeve, and drop-in anchors.

Find the right screw gauge, length, pilot hole size, and coating for any project. Covers deck, drywall, framing, cabinets, structural, and outdoor applications.