Measure the place where the label sits.
This calculator assumes a straight, circular cylinder with the same diameter throughout the label area. Measure across the container through its center, rather than entering its radius. Choose inches or millimeters and enter the usable label height separately. Avoid measuring over a lid, shoulder, molded ridge, or curved base. If the container narrows or widens along the label, this simple rectangular calculation cannot describe the required shape.
Choose one seam treatment.
Circumference equals π multiplied by diameter. For a visible gap, the calculator subtracts the gap from that circumference. For overlapping ends, it adds the overlap instead. A 50 mm diameter container has a circumference of about 157.0796 mm. With a 3 mm gap, the planned width is about 154.0796 mm; with a 3 mm overlap, it becomes about 160.0796 mm. The modes are exclusive so a single seam cannot accidentally be counted twice.
Use the result as a starting measurement.
A numerical wrap does not guarantee a suitable label. Surface coatings, moisture, temperature, adhesive choice, material stiffness, and stretch can all affect the result. The calculator does not model those conditions or add bleed and cut allowances. Make a paper strip at the proposed width and height, wrap it around the exact container, and inspect the seam and top and bottom edges. Confirm the final dieline and material with the production team. Keep key text away from a planned overlap. The downloadable note includes the diameter, circumference, seam choice, height, and formula, making it easier to discuss the plan without treating it as production approval.