ShopCalc: Machinist Calculator

The machinist calculator your shop uses every day — speeds and feeds, tap drill, threading, and conversational G-code, all offline. Stop guessing your speeds and feeds. Stop hunting for the tap drill chart on a greasy notebook page. Stop typing G-code by hand for simple ops. ShopCalc puts every machinist calculation a tap or two away — fully offline, no account, no ads. WHAT'S INSIDE • Speeds & Feeds — RPM, SFM, IPM, IPR for any tool, any material • Tap Drill — UNC, UNF, metric, full chart with class fits • Threading — single-point thread cutting (60° UN, ISO metric, ACME) • Drilling — peck schedules, point lengths, blind-hole depths • Drill Chart — number, letter, fractional, metric — all sizes side-by-side • Boring & Reaming — finish allowance and feed corrections • G-Code Generators — facing, threading, drilling, simple OD/ID • Bolt Circle Generator — XY points + canned cycle for any pattern • Lathe Jaw Bore — soft-jaw boring cycles with spring-pass option • G-Code Reference — quick lookup for G/M codes and program structure • Conversions — feed/speed unit conversions, taper math • Metal Weight — bar stock, plate, tube, by material and shape • Surface Finish — Ra ↔ Rz, common roughness conversions • Tool Library — save your shop's tools, pull settings instantly • Reference — material hardness, common tap sizes, common drill sizes WHO IT'S FOR Manual machinists, CNC operators, programmers, apprentices, hobbyists. If you spend any time at a lathe, mill, or VMC, ShopCalc earns its place on your phone in the first week. FREE vs PRO Free forever: speeds & feeds, tap drill, threading, conversions, drill chart, G-code reference. Pro unlocks G-code generators, bolt circle, jaw bore, tool library, metal weight, surface finish, and the full reference set. One-time purchase or subscription. NO ACCOUNT. NO ADS. NO DATA COLLECTION. ShopCalc works on the floor, in the cab, in a shielded plant. Everything runs locally. — From the makers of BuilderCalc, WelderCalc, and ElectricianCalc. doublevision.company/calculators