Ten years ago (time flies by), I wrote a topic about calculating the JumpStrength and Gravity by deciding on height and jump elevation duration (it was construct.net/en/forum/construct-2/general-discussion-17/choosing-jumping-parameters-95703 )
Long story short, every time I mention this type of scary math to people that aren't very comfortable with it, people usually don't look too much into it because it isn't an easy matter.
So recently (because someone needed help for their jumps), I made a tool with Construct 3 that will calculate just that and test the result as well, you can either set a height and jump elevation duration, or a height and gravity, and the tool will display the following :
Height (in pixels)
JumpDuration (in seconds)
JumpStrength (in pixels per seconds)
Gravity (in pixels per seconds squared)
So you can for example decide on a height and jump duration, and use the resulting gravity and jumpstrength in your platform behavior to have that exact jump in your project; Alternatively, you can decide on a height and gravity, and have the jumpstrength to use.
link to the tool is :
fishou.itch.io/jump-parameters-for-construct-3
it's pretty barebones, you click (or touch) to choose what values to set, then you edit textboxes and then click on an empty space to see the resulting jump.