Cut & Calc tool library
Practical calculators for real projects.
Fast, focused estimates for woodworking, metalworking, the workshop, and construction. Each tool explains its formula and gives a worked example.
Quick calculators
Use on the home page →Board Foot Calculator
Estimate hardwood volume from thickness, width, length, and quantity.
Calculate →Concrete Volume Calculator
Convert slab dimensions into cubic yards with a waste allowance.
Calculate →Stair Stringer Calculator
Find riser count, actual rise, tread count, and total run.
Calculate →Paint Estimator
Estimate gallons from wall area, openings, coats, and coverage.
Calculate →Woodworking
View category →Kerf Cut Calculator
Plan repeat cuts accurately by accounting for blade kerf between finished pieces.
Open calculator →Plywood Sheet Yield Calculator
Estimate how many rectangular parts fit on a sheet in either orientation.
Open calculator →Miter Angle Calculator
Find the saw setting for equal-sided frames and regular polygons.
Open calculator →Shelf Deflection Calculator
Estimate center sag for a simply supported shelf under an evenly distributed load.
Open calculator →Metalworking
View category →Metal Plate Weight Calculator
Estimate the weight of plate, flat bar, and rectangular stock from dimensions and density.
Open calculator →Sheet Metal Bend Allowance Calculator
Calculate bend allowance for flat-pattern development using a K-factor.
Open calculator →Cutting Speed and RPM Calculator
Convert surface speed and cutter diameter into spindle RPM and feed rate.
Open calculator →Workshop
View category →Tap Drill Size Calculator
Estimate an inch tap-drill diameter from nominal major diameter and threads per inch.
Open calculator →Open Belt Length Calculator
Estimate the length of an open belt connecting two pulleys.
Open calculator →Dust Collection CFM Calculator
Estimate airflow from duct diameter and target conveying velocity.
Open calculator →Construction
View category →Roofing Shingle Calculator
Estimate roof area, squares, and shingle bundles with pitch and waste allowances.
Open calculator →Deck Board Calculator
Estimate board count and linear footage for a rectangular deck surface.
Open calculator →Drywall Sheet Calculator
Estimate drywall sheets for walls and ceilings with openings and waste.
Open calculator →Gravel Volume and Tonnage Calculator
Estimate cubic yards and tons of gravel for paths, pads, and drainage layers.
Open calculator →