28" bicycle tires comes in different widths, which affects the circumference together with how hard they're inflated. In actual life even the weight on the wheel will affect the working circumference as tha tire will squash a bit under load. But ignoring all that the circumference is about 2.2 meters.
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In a car or bicycle tyre (US tire).In a car or bicycle tyre (US tire).In a car or bicycle tyre (US tire).In a car or bicycle tyre (US tire).
circumference of the tire.
In reality that answer would depend on the width of your tire, and on how inflated it is. If you're looking for a value to enter into a cyclocomputer, do a roll out instead. But a short answer is that it's about two metres.
Circumference of the circle: 28*pi inches
Circumference will equal diameter times pi. Multiply the diameter by 3.14