Convert 31 MM to Inches - Precision Calculator

Convert 31 millimeters to inches with precision control

Quick Answer
31 mm = 1.2205 in
โ‰ˆ 1 2/9" (fractional)
1 inch = 25.4 mm ยท 31 mm รท 25.4 = 1.2205 in

๐Ÿ“ Visual Size Comparison

Real-world comparison
About a table tennis ball (40 mm)
Actual size31 mm = 1.2205" (1 2/9")
Millimeters (mm)25031 mmInches (in)1.001.220"
Millimeter ticks
Inch ticks (1/16")
Note:The ruler shows actual size. You can verify it against a physical ruler.

Detailed Results

Decimal (4 places)
1.2205 in
Fraction (1/16")
1 2/9"
2 / 4 / 6 decimals
1.22 in ยท 1.2205 in ยท 1.220472 in
Reverse check
1.2205 in ร— 25.4 = 31 mm
1.2205 in
1 2/9"
31 mm = 1.2205 inches
Formula: 31 mm รท 25.4 = 1.2205 inches

Adjust Precision

Results at Different Precisions

2 Decimal Places
1.22 in
4 Decimal Places
1.2205 in
6 Decimal Places
1.220472 in

Fractional Inch Results

1/8" Precision
1 1/5"
1/16" Precision
1 2/9"
1/32" Precision
1 7/32"

๐Ÿชต Woodworking Application

For woodworking projects, 31 mm converts to approximately 1 2/9" when using 1/16" precision, which is standard for most woodworking measurements.

Common Wood Sizing:
Standard lumber thickness

โš™๏ธ Engineering Application

In engineering contexts, 31 mm equals 1.220472 inches with high precision (6 decimal places) for accurate technical specifications.

Engineering Format:
31 mm (1.220472")

๐Ÿ›’ E-commerce Product Description

For online product listings, you can describe this measurement as:

Standard: Size: 31 mm (1.22 inches)
Approximate: Approx. 1.22" (31mm)
Dimension: 31mm / 1.22"

๐Ÿ–จ๏ธ 3D Printing Application

For 3D printing, 31 mm is the standard metric measurement. The imperial equivalent is 1.2205 inches.

3D Print Context:
Medium part dimension

Where This Size Is Used

Small sizes (< 10 mm)
  • Precision measurement and tolerances
  • Electronics components and connectors
  • Jewelry and craft parts
Medium sizes (10โ€“100 mm)
  • Common hardware and fasteners
  • Phones, tablets, and accessories
  • Furniture fittings and fixtures
Large sizes (> 100 mm)
  • Construction and building materials
  • Furniture dimensions and clearances
  • Engineering project measurements
31 mm is close to Ruler width (30 mm)
31 mm is close to Notebook thickness (15 mm)
31 mm is close to Phone thickness (7.5 mm)

Quick Reference Table

MillimetersInches (Decimal)Inches (Fraction)
15.50 mm0.6102 in8/13"
23.25 mm0.9154 in11/12"
31.00 mm1.2205 in1 2/9"
38.75 mm1.5256 in1 8/15"
46.50 mm1.8307 in1 5/6"
62.00 mm2.4409 in2 7/16"

Frequently Asked Questions

How do I convert 31 mm to inches?

To convert 31 millimeters to inches, divide by 25.4 (the exact conversion factor). The result is 1.2205 inches.

What is 31 mm in fractional inches?

31 mm is approximately 1 2/9" when expressed as a fraction. This is commonly used in woodworking and construction.

Is this conversion accurate for engineering purposes?

Yes, our conversion uses the standard conversion factor (1 inch = 25.4 mm exactly) and supports up to 6 decimal places for high-precision engineering applications.

Need to Convert Different Values?

Use our interactive converter tool to convert any millimeter value to inches with real-time results.

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Quick Conversion Links

Popular millimeter and inch values with dedicated conversion pages.

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