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100% browser-based · no account · instant answers

Workshop math for makers,
without the guesswork

Six free calculators built for home workshop and woodworking hobbyists: how much finish to buy, which sandpaper grits to work through, how to size dust collection for a duct run, compound miter angles for frames and crown molding, an optimized lumber cut list, and a safe router bit speed for any material.

Finish coverageGrit progressionCut-list optimizerFree forever
Wood Finish Coverage CalculatorEnter your project's surface area, number of coats and finish type to see how much finish you need in millilitres and litres, and how many cans to buy.Sanding Grit Progression PlannerPick your starting surface condition and target finish quality to get the right grit sequence to sand through, plus an estimate of sheets needed per stage.Workshop Dust Collection SizerEnter your tool and ductwork run to see the dust collector airflow rating you actually need after realistic static-pressure losses in the duct.Compound Miter Angle CalculatorEnter the number of sides for a frame, box or room, plus a spring angle for crown molding, to get the miter and bevel angles to set on your saw.Lumber Cut-List OptimizerEnter the pieces you need to cut and your stock board length to see the minimum number of boards to buy and your total waste percentage.Router & Spindle Speed CalculatorEnter your bit diameter and the material you're cutting to get a safe recommended RPM range, since larger bits need slower speeds than small ones.

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Plan a project from finish to first cut

Start with the wood finish coverage calculator and the sanding grit progression planner to prep and finish a surface properly, size your dust collection for the tools you're running, then work out your miter angles and an efficient lumber cut list before you make a single cut. The router speed calculator keeps every bit running at a safe, clean-cutting RPM.

More tools

Wood Finish Coverage CalculatorEnter your project's surface area, number of coats and finish type to see how much finish you need in millilitres and litres, and how many cans to buy.Sanding Grit Progression PlannerPick your starting surface condition and target finish quality to get the right grit sequence to sand through, plus an estimate of sheets needed per stage.Workshop Dust Collection SizerEnter your tool and ductwork run to see the dust collector airflow rating you actually need after realistic static-pressure losses in the duct.Compound Miter Angle CalculatorEnter the number of sides for a frame, box or room, plus a spring angle for crown molding, to get the miter and bevel angles to set on your saw.Lumber Cut-List OptimizerEnter the pieces you need to cut and your stock board length to see the minimum number of boards to buy and your total waste percentage.Router & Spindle Speed CalculatorEnter your bit diameter and the material you're cutting to get a safe recommended RPM range, since larger bits need slower speeds than small ones.

Frequently asked questions

Is MakerBench really free, with no account needed?

Yes — every calculator runs entirely in your browser with no sign-up, no data collection and no cost. Nothing you type is sent to a server.

Who is MakerBench built for?

Home workshop and woodworking hobbyists — anyone finishing a project, sanding a tabletop, setting up dust collection, cutting miters, planning a cut list, or dialing in router speed, whether that's a weekend maker or a serious hobby shop.

Are these measurements in metric units?

Yes — every calculator on MakerBench uses metric units (centimetres, millimetres, square metres and litres) so it works for a global audience, not just one country's measurement system.

Can these tools replace careful measuring and test cuts in the shop?

No — they're planning and estimation tools built on realistic workshop defaults, not a substitute for measuring your own project, checking manufacturer specs, or making a test cut or test coat before committing to the real piece.