Conversion basics
Use the exact relationship of 1 inch = 25.4 mm for drawing, workshop, and procurement review.
Read mm to inch guideConversione bidirezionale professionale mm ↔ inch · Elaborazione batch · Copia ed esporta · Riferimento tecnico
💡 Fai clic su un pulsante → riempimento automatico e conversione
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L'accordo internazionale su yarda e libbra del 1959 definì 1 pollice = 25,4 mm.
Il Mars Climate Orbiter della NASA si è schiantato a causa di confusione di unità.
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.