This base converter allows you to convert 3-"letter" numbers (including numbers with zeroes in front of them, allowing you to do 1, 2, or 3-digit numbers) in bases 2-16 to 4-10. Please don't plug in outlandish numbers, like 23t, base funnyface, 255.66, or anything like that, or the cat will refuse to calculate. And check if your number is conventionally incorrect (say, 449 base 7). When calculating, it's common to have some leftover zeroes at the beginning of the number, so just ignore those. If you have the time, you may remix this project to expand the range of bases and numbers you can convert.
I've got to thank anything that has taught me number theory. Note: The button base 2 to 10 is for converting large binary numbers of 10 "letters". If you have to do smaller numbers, put zeroes in front of the number you desire to convert. That way, you trick the computer into thinking it's a ten-digit number instead of a number that has less than 10 digits. Another thing: Do not type in 000 or 001; it's the same thing in every base and the cat will not accept this fraudulence!