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.

Subscriptions auto-renew until cancelled. Manage in your Apple ID Subscription Settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://doublevision.company/privacy

NO ACCOUNT. NO ADS. NO DATA COLLECTION.
ShopCalc works on the floor, in the cab, in a shielded plant. Everything runs locally.