Inch to Micrometer Converter
Enter the value that you want to convert inch (in) to micrometer (µm) or micrometer to inch.Also written as IN to ΜM conversion.
1 inch = 25400.0000000 micrometer
Formula: micrometer = inch value × 25400.0000000
IN to ΜM — inch to micrometer
10 inch = 254000.00000 micrometer
Popular Length Converters:
Why Convert Inch to Micrometer?
The Inch Explained
Inch (in) is a unit of length measurement. 1 inch is equal to 25400.0000000 micrometer.
The Micrometer Explained
Micrometer (µm) is a unit of length measurement. 1 micrometer is equal to 0.0000394 inch.
Length Conversions in Practice
Length conversions connect the metric system used by most of the world with the imperial system still dominant in the United States, UK construction, and aviation. Architects convert between meters and feet for international projects. Machinists work in thousandths of an inch while referencing metric specifications. Runners compare kilometer race distances to miles. Screen sizes, paper formats, and fabric measurements all require frequent conversion between systems.
inch to micrometer metric conversion table
| 0.01 in | = | 254.00000 µm |
| 0.1 in | = | 2540.00000 µm |
| 1 in | = | 25400.00000 µm |
| 2 in | = | 50800.00000 µm |
| 3 in | = | 76200.00000 µm |
| 4 in | = | 101600.00000 µm |
| 5 in | = | 127000.00000 µm |
| 6 in | = | 152400.00000 µm |
| 7 in | = | 177800.00000 µm |
| 8 in | = | 203200.00000 µm |
| 9 in | = | 228600.00000 µm |
| 10 in | = | 254000.00000 µm |
| 11 in | = | 279400.00000 µm |
| 12 in | = | 304800.00000 µm |
| 13 in | = | 330200.00000 µm |
| 14 in | = | 355600.00000 µm |
| 15 in | = | 381000.00000 µm |
| 16 in | = | 406400.00000 µm |
| 17 in | = | 431800.00000 µm |
| 18 in | = | 457200.00000 µm |
| 19 in | = | 482600.00000 µm |
| 20 in | = | 508000.00000 µm |
| 30 in | = | 762000.00000 µm |
| 40 in | = | 1016000.00000 µm |
| 50 in | = | 1270000.00000 µm |
| 60 in | = | 1524000.00000 µm |
| 70 in | = | 1778000.00000 µm |
| 80 in | = | 2032000.00000 µm |
| 90 in | = | 2286000.00000 µm |
| 100 in | = | 2540000.00000 µm |
| 200 in | = | 5080000.00000 µm |
| 300 in | = | 7620000.00000 µm |
| 400 in | = | 10160000.00000 µm |
| 500 in | = | 12700000.00000 µm |
| 600 in | = | 15240000.00000 µm |
| 700 in | = | 17780000.00000 µm |
| 800 in | = | 20320000.00000 µm |
| 900 in | = | 22860000.00000 µm |
| 1000 in | = | 25400000.00000 µm |
How to Convert IN to ΜM (Inch to Micrometer)?
We can convert inch to micrometer by using an example.
Example:
Convert 20 Inch to Micrometer?
We know 1 Inch = 25400.0000000 micrometer; 1 Micrometer = 0.0000394 inch.
20 inch = ___µm
20 × 25400.0000000 = 508000.00000 µm (we know 1 inch = 25400.0000000 micrometer)
Answer:
20 inch = 508000.00000 micrometer
How to Convert Inches to Micrometers (Step-by-Step)
Converting inches to micrometers (μm) is critical in precision machining, semiconductor manufacturing, and surface finish specifications. Since 1 inch equals exactly 25,400 micrometers, multiply by 25,400.
- Write down the measurement in inches.
- Multiply the inch value by 25,400.
- The result is the equivalent length in micrometers (μm).
Common Inches to Micrometers Conversions
Precision measurement reference for machining tolerances, surface finish, and thin materials.
| Inch | Micrometer |
|---|---|
| 0.0001 inches (0.1 mil) | 2.54 μm |
| 0.001 inches (1 mil) | 25.4 μm |
| 0.005 inches (5 mil) | 127 μm |
| 0.01 inches (10 mil) | 254 μm |
| 0.025 inches (25 mil) | 635 μm |
| 0.1 inches | 2,540 μm |
| 0.5 inches | 12,700 μm |
| 1 inch | 25,400 μm |
Solved Examples: Inches to Micrometers
Question 1: A machining tolerance is ±0.0005 inches. What is this in micrometers?
Solution:
μm = inches × 25,400
= 0.0005 × 25,400
= 12.7 μm
Answer: ±0.0005 inches = ±12.7 μm tolerance
Question 2: A surface finish specification is 32 micro-inches (μin). Convert to micrometers.
Solution:
32 micro-inches = 32 × 10⁻⁶ inches
μm = 32 × 10⁻⁶ × 25,400
= 0.813 μm
Answer: 32 μin = 0.813 μm (typical machined surface finish)
Question 3: A PCB copper layer is 0.0014 inches (1.4 mil). How many micrometers?
Solution:
μm = 0.0014 × 25,400
= 35.56 μm
Answer: 0.0014 inches = 35.56 μm (1 oz copper foil thickness)
Question 4: Convert a bearing clearance of 0.002 inches to micrometers.
Solution:
μm = 0.002 × 25,400
= 50.8 μm
Answer: 0.002 inches = 50.8 μm (typical engine bearing clearance)
Practice Questions
Try solving these on your own to test your understanding:
- Convert 0.01 inches to micrometers. (Answer: 254 μm)
- A coating is 0.003 inches thick. How many μm? (Answer: 76.2 μm)
- Convert 0.0002 inches to micrometers. (Answer: 5.08 μm)
- A wire is 0.032 inches diameter. Express in μm. (Answer: 812.8 μm)
- Convert 0.1 mil to micrometers. (Answer: 2.54 μm)
Precision Machining: Thousandths and Micrometers
In CNC machining, tolerances are specified in thousandths of an inch (thou/mils) or micrometers. Common conversions: ±0.001" = ±25.4 μm (standard machining), ±0.0005" = ±12.7 μm (precision machining), ±0.0001" = ±2.54 μm (ultra-precision/grinding). Surface roughness (Ra): 125 μin = 3.18 μm (rough cut), 32 μin = 0.81 μm (finish cut), 8 μin = 0.20 μm (ground/polished).
PCB Manufacturing: Mils to Micrometers
Printed circuit board specifications use mils (thousandths of an inch): trace width 5-10 mil (127-254 μm), trace spacing 5-10 mil, via drill 8-12 mil (203-305 μm), copper weight 1 oz = 1.4 mil (35.56 μm), 2 oz = 2.8 mil (71.12 μm). Solder mask thickness is 0.4-1.0 mil (10-25 μm). As PCB features shrink, the industry moves toward micrometer specifications.
Surface Finish Standards: Micro-inches to Micrometers
Surface roughness (Ra) is specified in micro-inches (μin) in the US or micrometers (μm) internationally. Conversion: 1 μin = 0.0254 μm. Common finishes: as-cast 250-1000 μin (6.35-25.4 μm), milled 32-125 μin (0.81-3.18 μm), ground 8-32 μin (0.20-0.81 μm), lapped/polished 1-4 μin (0.025-0.10 μm). ISO standards use μm exclusively.
Key Takeaways
- Multiply inches by 25,400 to get micrometers (1 inch = 25,400 μm).
- 1 mil (0.001 inch) = 25.4 μm — the most used conversion in machining.
- Surface finish: 32 μin = 0.81 μm (standard machined surface).
- PCB traces: 5 mil = 127 μm, 10 mil = 254 μm.
- Precision tolerance ±0.0005" = ±12.7 μm.
- International standards use μm; US shops often use mils (thou).
Inch to Micrometer Conversion Formula
micrometer = inch × 25400.0000000
1 inch = 25400.0000000 micrometer
1 micrometer = 0.0000394 inch
Reverse: inch = micrometer × 0.0000394
Frequently Asked Questions
How many micrometer are in 1 inch?
There are 25400.0000000 micrometer in 1 inch. To convert inch to micrometer, multiply the value by 25400.0000000.
How do I convert inch to micrometer?
Multiply your inch value by 25400.0000000 to get the equivalent in micrometer. For example, 5 inch = 5 × 25400.0000000 = 127000.00000 micrometer.
How do I convert micrometer to inch?
Multiply your micrometer value by 0.0000394 to get the equivalent in inch. Alternatively, divide by 25400.0000000.
What is 10 inch in micrometer?
10 inch is equal to 254000.00000 micrometer.
What is 100 inch in micrometer?
100 inch is equal to 2540000.00000 micrometer.