Runecrafting
1-9 using airs : 969xp req, which is 969/5 = 193.8 ess
i.e. 194 ess so current is 970xp.
9-14 using earths : 1137xp req, which is 1137/6.5 = 174.9 ess
i.e. 175 ess so current is 2107.5xp.
14-20 using fires: 2362.5xp req, which is 2362.5/7 = 337.5 ess
i.e. 338 ess so current is 4473.5xp
Therefore, 707 ess required for level 20 runecrafting following the guide.

Wiki entry:
"Following this guide exactly, it requires 707 rune essence to reach level 20. Overshoot this target by an inventory because of slight complications with exactness."


Prayer
15xp per big bone.
4.5xp per normal bone.
1125xp from Restless Ghost.
Target level 25 (prot item): 6717/15 = 447.8 = 448 big bones.
Target level 43 (prot melee): 49214/15 = 3280.9 = 3281 big bones.

Wiki entry:
"Assuming Restless Ghost is complete, you will be just shy of level 10. From here, it will take 448 big bones to reach Protect Item (level 25), or 3281 big bones to Protect from Melee (level 43).
If we assume our 6k xp/hour at the boneyard, this will take just over an hour for Protect Item, and more than 8 hours for Protect from Melee."


Crafting
Start at level 16: 2746xp.
Target level 50: 101333
98587/50 = 1972 symbols or 98587/52.5 = 1878 tiaras.
Target level 70: 737627
734881/50 = 14698 symbls or  734881/52.5 = 13998 tiaras.

Wiki entry:
"For 50 crafting, which is required for a strength amulet, it will take 1972 symbols or 1878 tiaras.
For 70 crafting, which is required for a power amulet, it will take 14698 symbols or 13998 tiaras."