There are 1000 mils (thou) in an inch. To convert from inches to mil, multiply the inch value by 1000. To convert from mil to inches, divide the mil value by 1000 (or multiply by 0.001).
1 Inch = 1 000 Mils
1 Mil = 0.001 Inch
Inch is an Imperial and US Customary length unit. The abbreviation is "in".
Mil (also know as "thou") is an imperial length unit and equals to one thousandth of an inch. Usually used in engineering for precise measurements.