The other day, I discovered a Warp Speed Calculator website (https://www.st-minutiae.com/resources/warp/index.html).
I was having fun figuring out how long it would take different ships in Star Trek to travel various distances when I noticed an inconsistency. If I enter the speed of Voyager and the distance it would take them to return the Alpha Quadrant, the website calculates it would take only 13 years for Voyager to return home. In the show, it is stated that it would take 75 years! Not satisfied with this, I consulted another source for warp speed, the Youtube video "Warp speeds compared" from the channel EC Henry. In this video, he states that Voyager's speed, warp 9.975, is equal to 4354c, whereas the Warp speed calculator states that 9.975 is equal to 5126c. Unfortunately, both estimates make Voyager's journey far to shorter and shrinks the galaxy significantly. Even weirder, if you calculate warp 9.975 in the TOS scale, the journey length stated in the show is accurate, however, we know from the show that Voyager uses the TNG scale. If Voyager had a speed of 9.975 TOS, then it would only be ~7.7 TNG. Perhaps the warp speed calculator is simply flawed, or perhaps the entire premise of Star Trek: Voyager and the scale of the Milky Way galaxy in Star Trek is wrong. Hopefully, it's the former, otherwise we've got bigger continuity issue than Discovery on our hands.
P.S. If anyone could share an actual formula as to how to convert warp factors to multiples of the speed of light, that would be great.