30 mm to Inches
30 mm ≈ 1.18 in
30 millimeters is approximately 1.18 inches.
How to convert 30 mm to in
Use the formula in = mm ÷ 25.4:
in = 30 ÷ 25.4in = 1.181102
So 30 mm = 1.181102 in, or about 1.18 in rounded.
Rounded values and quick estimate
- Rounded to a whole number: 1 in
- Rounded to one decimal place: 1.2 in
- Conversion factor: 1 millimeter = 0.0394 inches
Quick mental estimate: divide by 25. For 30 mm that gives about 1.2 in — off by 0.0189 in (1.6%). Use the exact formula when precision matters.
30 mm in other units
30 mm is 1.181 inches, about 1 3/16″. Rifle scopes are made with either 1″ or 30 mm main tubes, which need different rings, and 30 mm is a common size for bike, furniture and machine parts.
- Inches
- 1.18 in
- Centimeters
- 3 cm
- Meters
- 0.03 m
- Kilometers
- 0.00003 km
- Feet
- 0.0984 ft
- Yards
- 0.0328 yd
- Miles
- 0.000019 mi
- Micrometers
- 30000 µm
- Hands
- 0.2953 hh
- Nautical miles
- 0.000016 nmi
- Mils (thou)
- 1181.1 mil
30 mm and nearby values
About millimeters and inches
A millimeter is one thousandth of a meter (0.1 cm). It is used for small, precise measurements like rainfall, screws and paper thickness.
An inch is defined as exactly 2.54 centimeters. There are 12 inches in a foot; inches are used in the US for screens, heights and small lengths.
Related conversions
Frequently asked questions
What is 30 mm in Inches?
30 millimeters is about 1.18 inches (30 mm ≈ 1.18 in).
How do you convert 30 mm to in?
Apply in = mm ÷ 25.4: in = 30 ÷ 25.4, in = 1.181102.
How many millimeters is 1.18 in?
1.18 in is about 29.97 millimeters.
What is 30 mm in inches as a fraction?
About 1 3/16″ (1.1875″), which is 0.16 mm larger than 30 mm.