4 centimeters = 1.57 inches (1.57 inches), or 1 9/16" as a fraction. Use the copy buttons below to grab the exact format you need.
The centimeter (cm) and the inch (in) are two of the most common units of length in everyday use. Centimeters belong to the metric system — used by most of the world — while inches are part of the imperial system, still widely used in the United States, UK (for personal measurements), and Canada. Converting between the two is straightforward: 1 inch = 2.54 cm, so to go from centimeters to inches you divide by 2.54. For 4 cm, that gives you 4 ÷ 2.54 = 1.57 inches.
4 cm
1.57 inches
1.57 in · 1 9/16"
Decimal inches
1.57 in
Feet + inches
0ft 1.57in
Fraction
1 9/16"
Full statement
4 cm = 1.57 inches
Enter any centimeter value below to instantly see its conversion to inches in decimal, feet, and fraction formats.
Here are three practical situations where knowing that 4 cm equals 1.57 inches makes a real difference.
You're sourcing a 4 cm shelf bracket, curtain rod, or cabinet panel from a European supplier — but your local hardware store uses imperial measurements. That 4 cm piece is 1.57" (1 9/16"), which you'd round to the nearest standard US lumber or hardware size. For framing or trim work in the US, knowing the fractional equivalent (1 9/16") is especially useful since US tape measures mark in 1/16" increments.
International clothing brands — particularly European and Asian labels — list garment dimensions in centimeters. If a jacket has a 4 cm chest, sleeve, or back length, that translates to roughly 1.57" (1.57 in). Cross-referencing this against a US or UK sizing chart is the fastest way to find your fit without needing to try on the item. Inseams, shoulder widths, and rise measurements all follow the same math.
In a science or math class, you might measure an object as 4 cm using a metric ruler, then need to express it in the imperial system for a comparison exercise or US-format worksheet. The answer is 1.57 inches, or 1 9/16" in fractional form. A useful rule of thumb to remember: 1 inch = 2.54 cm, and 1 cm ≈ 0.394 inches. For 4 cm: 4 × 0.394 ≈ 1.57 in.
See how 4 cm compares to nearby centimeter values and their inch equivalents.
Common questions about converting 4 cm to inches, answered.