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🔧 mm to inch | Engineering Unit Converter

Professional mm ↔ inch bidirectional conversion · Batch processing · Copy & Export · Engineering reference

🔹 Input (mm)

📏 Result

1.0000 in

🚀 Batch conversion (one value per line, current mode: mm → inch)

⚡ Quick engineering values (one‑click fill)

💡 Click a button → auto‑fill input and convert

mm	inch	Copy

📐 Core formula
1 inch = 25.4 mm | Bidirectional conversion
✅ Engineering standard (ISO 2848) · CNC / CAD

🏭 Real engineering use cases

🛠️ CNC machining tolerance
Common tolerance ±0.1mm → ±0.0039in.

📏 Sheet metal thickness
1.5mm ≈ 0.059in; 2.0mm ≈ 0.079in.

🔩 Bolt size (M series)
M6 ≈ 0.236in.

🖨️ 3D printing scaling
1mm = 0.03937in for slicer.

📐 Mechanical drawing units
Avoid unit confusion.

⚙️ Spindle speed / feed
in/min → mm/min.

1959 international yard and pound agreement defined 1 inch = 25.4 mm.

NASA Mars Climate Orbiter crashed due to unit confusion.

✅ Copied to clipboard