I personally have used this site a rediculas amount of times and the most of the things that calculators doesn't i figre out myself. i made this accout specifically to address this matter because i would like to see that upgrade to the site.

 

However when doing slayer and figuring if a creature is 'worth' fightin for its slayer exp', there is nothing written in their bestiary specifying how much slayer experience you get from each creature that would be assigned.

I believe the Bestiary lists the HP of the monster; as the amount of Slayer Experience obtained from a monster is equal to the overall HP of the monster, I don't think a Slayer Experience option is really needed, HP value is simply what you're requesting I think? ;)

Yup hp of monster = slayer xp gained for killing it

Generally speaking hp = slayer xp but there are some monsters where it might be more or less. But as far as I know/aware it's only like that with a hand full of monsters.

And even then the difference is only marginal (like 1.5xp or less difference). Not worth adding IMO.

I think the ones where the hp differs from the slayer exp is where they regenerate hp during the fight.

Every monster could do this (well that I'm a aware of), but its mainly the higher level ones like mith dragons.

Well that's how I was told it works last time I ask the question.