As with many products in the gear world, bike wheel circumferences are not standardized. While there have been efforts made to standardize wheel sizes and their coding, it isn’t absolute in terms of the wheel. This means that the circumference of two tires of the same size will be different depending on the brand.
For bike stats, the circumference is called ‘wheel factor’. Manufacturers might provide it, but another way to measure or check it is to roll the wheel once fully and measure how far it has traveled. Put a mark on the wheel and on the ground (perhaps do this outside!), match up the marks, roll the wheel until the wheel mark is back on the ground, make another mark on the ground and measure the distance between the two marks. That’s the wheel factor.