在制造和工业机器零件的许多领域,将小数转换为英寸,将小数转换为小数极为重要. 了解一些简单如小数分数(0.1250)中1/8英寸的尺寸,或者分数分数中0.5938等分的小数可以对一个项目的结果产生重要影响. 本页提供从1/128到1英寸的综合转换表,并附有一个交互计算器,用于快速而方便的参考.
小数英寸到小数计算器
转换公式
混合数字: 整体 + (数值除号) = 十进制
示例: 2 3/8 = 2 + (3 ÷ 8) = 2 + 0.375 = 2.375英寸
小数英寸到小数转换表
完整参考表从1/128到1英寸,按分母排列. 数值四舍五入到小数点后4个位,供实际使用.
| 分数( 英寸) | 小数 (英寸) | 毫米 (mm) |
|---|
理解英寸分数
小分英寸系统
帝国分寸系统将分寸分为分寸,分寸,分寸,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相,分相分相. 每个关卡的精度都增加一倍. 这个系统在美国制造,建筑,和木工中都是标准的.
小数英寸
十进制英寸作为一英寸的十进制分数进行快度测量(如0.375而不是3/8). 这种格式在数控加工,精度工程,CAD软件中首选,其中小数计算更为实用.
英寸到毫米
1英寸正等于25.4毫米. 这一换算系数于1959年被国际标准化. 将任何英寸的测量转换为毫米,乘以25.4. 结果准确无误,没有四舍五入错误.
精度级别
常见精度等级:1/16"(0.0625)为普通Z建筑,1/32"(0.03125)为木工,1/64"(0.015625)为金属加工,1/128"(0.078125)为精密加工和测量.
用英寸分数工作的提示
实用准则
- Use 4 decimal places (0.0001") for most manufacturing — this equals 0.00254 mm accuracy
- When reading calipers, decimal inch scales show 0.001" increments; vernier scales show 0.0001"
- Drill bit sizes commonly use 1/64" increments from 1/64" to 1/2", then letter and number sizes
- For CNC programming, always use decimal inches or metric — never fractional input
- When converting back from decimal to fraction, find the closest standard fraction in the table above
- Tolerance stacking: each fractional conversion introduces rounding; carry extra decimal places in intermediate calculations
常见问题解答
To convert a fraction to decimal inches, divide the numerator by the denominator. For example, 3/8 inch = 3 ÷ 8 = 0.375 inches. For mixed numbers like 2 3/8, convert the fraction first (0.375) then add the whole number (2 + 0.375 = 2.375 inches). Use our calculator above for instant conversion.
1/8 inch as a decimal is 0.1250 inches. In millimeters, 1/8 inch equals 3.1750 mm. This is a common measurement in manufacturing, woodworking, and metalworking applications. It's also a standard drill bit and fastener size.
3/16 inch as a decimal is 0.1875 inches. In millimeters, 3/16 inch equals 4.7625 mm. This size is commonly used in drill bits, fasteners, and sheet metal work. It falls between 1/8" (0.125) and 1/4" (0.25).
To convert decimal inches to millimeters, multiply the decimal value by 25.4 (since 1 inch = 25.4 mm exactly). For example, 0.375 inches × 25.4 = 9.525 mm. This conversion factor is exact and internationally standardized since 1959, so there is no rounding error.
5/64 inch as a decimal is 0.0781 inches (rounded to 4 decimal places). The exact value is 0.078125 inches. In millimeters, 5/64 inch equals 1.9844 mm. This is a common drill bit size used in metalworking and precision applications.
在美国制造业中，分数英寸仍很常见，特别是在建筑、木工和老式机械领域。 许多工具、钻头和紧固件的尺寸仍以分数形式标注（以1/64、1/32、1/16为增量）。然而，在精密制造和数控加工领域，小数英寸和公制单位正被越来越广泛地采用。.
1/64 inch = 0.015625 decimal inches (0.3969 mm), while 1/128 inch = 0.0078125 decimal inches (0.1984 mm). The 1/128 increment is half the size of 1/64, providing finer precision. 1/128 increments are used in high-precision machining and gauge block measurements where extremely tight tolerances are required.
在一般制造和建筑领域，小数点后4位（0.0001英寸）是标准做法，其精度可达0.00254毫米。 在精密加工领域，通常采用小数点后4至5位。对于量块和高精度加工，可能需要小数点后多达6位。大多数以1/64英寸为单位的分数换算，在小数点后4位时即为精确值。.
