What does 4 inches look like?

4-Inch Distance Comparisons

• Measured against the circumference of a Major League baseball, 4 inches is about 44% of that reference length.

  A Major League baseball must measure between 9 and 9.25 inches around; 9.125 inches is the midpoint of that official range. Using its published size of 9.13 inches, dividing 4 by that reference gives 44% of that measurement.

  Source: Major League Baseball

• For scale, 4 inches spans about 5.7 times the diameter of a U.S. dime.

  The United States Mint lists the dime as the smallest currently circulating U.S. coin by diameter, measuring 0.705 inches across. The source measurement converts to 0.71 inches, so the proportional comparison with 4 inches is 5.7 of those measurements.

  Source: United States Mint

• 4 inches is about 33% of the width of a 13-inch MacBook Air.

  Apple's 13-inch MacBook Air measures 11.97 inches across its widest exterior dimension when closed. Its published measurement is 11.97 inches; the comparison comes from placing that figure against 4 inches.

  Source: Apple

• 4 inches is about 81% of the height of a standard passport booklet.

  The international machine-readable passport format is 125 millimetres tall, which converts to approximately 4.92 inches. The source measurement converts to 4.92 inches, so the proportional comparison with 4 inches is 81% of that measurement.

  Source: International Civil Aviation Organization

• Measured against the height of a standard U.S. license plate, 4 inches is about 67% of that reference length.

  The standard North American passenger-vehicle license plate format uses a vertical dimension of 6 inches. At 6 inches, this familiar reference provides a direct scale comparison: the target distance covers 67% of that measurement.

  Source: American Association of Motor Vehicle Administrators

• Picture the diameter of a regulation tennis ball: 4 inches is about 1.5 times its measured length.

  An approved Type 1 tennis ball uses a diameter range whose midpoint is approximately 2.64 inches. Using its published size of 2.64 inches, dividing 4 by that reference gives 1.5 of those measurements.

  Source: International Tennis Federation

• 4 inches is almost exactly the same length as the diameter of a regulation golf hole.

  The Rules of Golf require each hole on a putting green to be 4.25 inches across and at least 4 inches deep. Its published measurement is 4.25 inches; the comparison comes from placing that figure against 4 inches.

  Source: United States Golf Association

• 4 inches is approximately 10.2 centimeters.

  Using the exact conversion that 1 inch equals exactly 2.54 centimeters, the unrounded result is 10.16 centimeters.