Convert 80 mm to inches | Calculator

Quick Answer: 80 mm = 3.1496 inches ≈ 3 532"

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80 mm = 3.1496 inches

80 mm ≈ 3 in (error: 4.75%)

80 mm ≈ 3 14 in (error: 3.19%)

80 mm ≈ 3 18 in (error: 0.78%)

80 mm ≈ 3 532 in (error: 0.21%)

80 mm ≈ 3" (error: 4.75%)

Quick calculation:

  1. 80 mm ÷ 25.4 = 3.1496"
  2. 3.1496 × 2 = 6.3 → round to 6
  3. Result: 6/2

3" / 8 cm on a Ruler

Imperial (inches)

3 in on a ruler 0 1 2 3 4 3 in

Metric (cm)

8 cm on a ruler 0 1 2 3 4 5 6 7 8 9 10 8 cm

The red markers show 80 mm as 3" (imperial) and 8 cm (metric).

Learn more about converting mm to fractional inches →

Similar MM to Inches Conversions

Values close to 80 mm for quick reference:

Millimeters Decimal Inches Fractional Inches
55 mm 2.1654″ 2 11/64″
60 mm 2.3622″ 2 23/64″
65 mm 2.5591″ 2 9/16″
70 mm 2.7559″ 2 3/4″
75 mm 2.9528″ 2 61/64″
80 mm 3.1496″ 3 5/32″
85 mm 3.3465″ 3 11/32″
90 mm 3.5433″ 3 35/64″
95 mm 3.7402″ 3 47/64″
100 mm 3.937″ 3 15/16″
105 mm 4.1339″ 4 9/64″

See Also

Frequently Asked Questions

How much is 80 mm in inches?

80 millimeters equals 3.1496" (exactly 80 ÷ 25.4 inches).

How do I convert 80 mm to inches?

Divide millimeters by 25.4: 80 ÷ 25.4 = 3.1496 inches.

Is the conversion exact?

Yes. 1 inch = 25.4 mm exactly (1959 International Yard and Pound Agreement). All values on this page use this exact factor.

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80 mm to inches — 3.1496"

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All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.

Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes