Climbing vs the gym
An hour at the climbing wall burns about 425 kcal, an hour of weight training about 370. Climbing wins by 55 kcal.
The difference
55 kcal burned
Climbing works your arms, back, grip and legs at once, and you hold your body up the whole time you are on the wall. In the gym the rests between sets bring the hourly number down.
Train hard with short rests and the gym gets close: about 440 kcal for a hard hour. A 90 minute climbing session is about 640. These numbers are for about 70 kg.
Bouldering with mates or lifting on your own, pick the one you will keep doing. In Caltype just type "bouldering 1 hour".
Just type it
In Caltype you type what you ate like a note to yourself, and it's counted for you. No weighing, no scrolling through a database.
Questions
Does climbing burn more than the gym?
A little: about 425 against 370 kcal an hour.
How many calories does a 90 minute climbing session burn?
About 640 kcal for someone around 70 kg.
How many calories does a hard gym session burn?
About 440 kcal for an hour with short rests.

