Conversion basics
Use the exact relationship of 1 inch = 25.4 mm for drawing, workshop, and procurement review.
Read mm to inch guideConversión bidireccional profesional mm ↔ inch · Procesamiento por lotes · Copiar y exportar · Referencia de ingeniería
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El acuerdo internacional de yarda y libra de 1959 definió 1 pulgada = 25.4 mm.
El Mars Climate Orbiter de la NASA se estrelló debido a confusión de unidades.
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.