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About Kopo

Kopo is the essential toolkit for machinists, technicians, students, and mechanical professionals. All your workshop calculations in one app, usable without an internet connection.

MACHINING CALCULATIONS
• Spindle speed (rpm) from cutting speed and diameter
• Milling feed (mm/min) and feed per revolution
• Surface finish Ra as a function of feed and tool radius
• Pilot tap with stainless steel allowance

MECHANICAL CALCULATIONS
• Screw strength: breaking strength, yield strength, shear strength
• Tightening torque (Nm) by screw class
• Metric thread: standardized dimensions M3 to M30
• Trigonometry: solving right triangles

TOLERANCES & ASSEMBLIES
• ISO 286-1 tolerances: bore and shaft, grades IT3 to IT14
• Fits: free, uncertain, interference, press fit — instant result
• ISO 6636 keys
• DIN 471/472 circlips
• Pins and dowel pins

LIBRARY MATERIALS & TOOLS
• 10 predefined materials: steel, stainless steel, aluminum, brass, cast iron
• Complete properties: Rm, Young's modulus, HB hardness, indicative Vc
• Create and save your custom materials
• Tools: HSS, carbide, ceramic, cermet, diamond with Vc coefficients

DESIGNED FOR THE WORKSHOP
• Works 100% offline — no Wi-Fi or network required
• Simple and fast interface, designed for use with dirty hands
• No account creation, no registration required
• Instant results with displayed formulas
• Technical diagrams on each calculator
Kopo is the pocket reference every mechanic should have.