How do I know if I have dyscalculia?

Hello, I just learned about dyscalculia today and now I’m curious if I have it. My dad had dyslexia so maybe it’s possible but I’m not quite sure. Math has never been a strong suit of mine and I honestly don’t think I’d be able to do a math class without a calculator. I can add and subtract fine (although it takes a lot of brain power) but I can’t multiply or divide in my head unless it’s super basic like 0x or 1x and sometimes 5x or 10x but only with smaller number. Plus I can only do math for so long before my brain gets fried. But all that could just be me being bad at math.

I also struggle with distance like when I ask how far something is and someone responds with the distance I’ll ask how far it is instead because the distance doesn’t really mean anything to me. The same thing with other forms of measurement too, I can get a vague sense when it comes to height and weight (2 inches is tiny and 200 pounds is heavy) but I need to compare it to something else to really comprehend it.

But I don’t know if that stuff actually means I have dyscalcula. Is there some more obvious signs I can point to or something I can do that straight up disproves it? Obviously I don’t want to self diagnose if I’m not sure and it’d be nice to know if this is something I should look into more but if I’m already looking too deep into it.