20 mm to Inches

20 mm ≈ 0.7874 in

20 millimeters is approximately 0.7874 inches.

How to convert 20 mm to in

Use the formula in = mm ÷ 25.4:

in = 20 ÷ 25.4
in = 0.787402

So 20 mm = 0.787402 in, or about 0.7874 in rounded.

Rounded values and quick estimate

Rounded to a whole number: 1 in
Rounded to one decimal place: 0.8 in
Conversion factor: 1 millimeter = 0.0394 inches

Quick mental estimate: divide by 25. For 20 mm that gives about 0.8 in — off by 0.0126 in (1.6%). Use the exact formula when precision matters.

20 mm in other units

20 mm is 0.787 inches — 2 centimetres, just over 3/4″ (0.75″ = 19.05 mm) and very close to 25/32″. It is a standard size for electrical conduit, garden hose fittings and worktop thickness.

Inches: 0.7874 in
Centimeters: 2 cm
Meters: 0.02 m
Kilometers: 0.00002 km
Feet: 0.0656 ft
Yards: 0.0219 yd
Miles: 0.000012 mi
Micrometers: 20000 µm
Hands: 0.1969 hh
Nautical miles: 0.000011 nmi
Mils (thou): 787.4 mil

20 mm and nearby values

Millimeters	Inches
16 mm	0.6299 in
17 mm	0.6693 in
18 mm	0.7087 in
19 mm	0.748 in
20 mm	0.7874 in
21 mm	0.8268 in
22 mm	0.8661 in
23 mm	0.9055 in
24 mm	0.9449 in

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 20 mm in Inches?

20 millimeters is about 0.7874 inches (20 mm ≈ 0.7874 in).

How do you convert 20 mm to in?

Apply in = mm ÷ 25.4: in = 20 ÷ 25.4, in = 0.787402.

How many millimeters is 0.7874 in?

0.7874 in is about 20 millimeters.

Is 20 mm bigger than 3/4 inch?

Yes, by about 0.95 mm. A 3/4″ hole or fitting will be slightly too small for a 20 mm part.