Home & DIY Calculators
Sizing, cost, and payback math for projects around the house and yard.
Hot Tub Volume Calculator
Enter your hot tub's shape and dimensions to get its water volume in gallons and liters.
Solar Panel Payback Period Calculator
See how many years until your solar panels pay for themselves in electricity savings.
Basement Finishing Cost Estimator
Get a ballpark cost estimate for finishing your basement, based on square footage and finish quality.
Pond Liner Size Calculator
Enter your pond's dimensions to get the exact liner size you need to buy.
Chandelier Size Calculator
Get the recommended chandelier diameter and hanging height from your room's dimensions.
Duplex Construction Cost Calculator
Get a ballpark cost estimate for building a duplex, based on total square footage and finish quality.
End Grain Cutting Board Calculator
Find how many strips you need and how wide your raw board should be, accounting for saw kerf loss.
Flexible Duct Sizing Calculator
Enter your required airflow (CFM) to get the recommended flexible duct diameter.
Paver Base Calculator
Enter your patio or walkway dimensions to get exactly how much gravel base and bedding sand to order, including the compaction allowance.
Log Board Foot Calculator
Enter a log's small-end diameter and length to compare its estimated lumber yield under the Doyle, Scribner, and International 1/4-inch scaling rules.
Chicken Coop Size Calculator
Enter your flock size and breed mix to get the indoor coop space and outdoor run space your chickens need.
Pipe Slope Calculator
Get the total fall and grade percentage for a drain pipe run, checked against IPC/UPC code minimums.
Foundation Squaring Calculator
Check a rectangular foundation, deck, or slab layout is truly square using the diagonal or 3-4-5 method.
Unit Price Calculator
Enter the price, quantity, and unit for two products to see which is the better deal per ounce, pound, gram, or liter, and by how much.
Hip Roof Calculator
Enter your building's length, width, pitch, and overhang to get ridge length, common and hip rafter lengths, roof area, and roofing squares.