Conversion basics
Use the exact relationship of 1 inch = 25.4 mm for drawing, workshop, and procurement review.
Read mm to inch guideConversion bidirectionnelle professionnelle mm ↔ inch · Traitement par lots · Copier et exporter · Référence technique
💡 Cliquez sur un bouton → remplissage automatique et conversion
| mm | inch | Copier |
|---|
L'accord international sur la verge et la livre de 1959 a défini 1 pouce = 25,4 mm.
Le Mars Climate Orbiter de la NASA s'est écrasé à cause d'une confusion d'unités.
Use the exact relationship of 1 inch = 25.4 mm for drawing, workshop, and procurement review.
Read mm to inch guideReview source units, decimal precision, tolerances, and release notes before sharing converted dimensions.
Read drawing checklistConvert lists of values for sheet thickness, hole sizes, stock length, and inspection reports.
Read batch guideIt uses the exact relationship 1 inch = 25.4 millimeters. Millimeters are divided by 25.4 to get inches, and inches are multiplied by 25.4 to get millimeters.
Yes. Paste one value per line in the batch area, choose the current direction, and run batch conversion.
Use enough decimals for the drawing tolerance and process capability. Reference values can use fewer decimals than manufacturing control dimensions.