Should I always use a position size calculator for each trade?

Beginner Questions
1

I trade multiple Fx pairs, and always use the same lot size calculation irrespective of which pair… obviously this will lead to different % wins or losses for each trade despite always having a 20Pip SL 60Pip TP and Lot size = Balance x 0.0002… Losses average out of the trades between maybe 2.5-3.5% and the flip side same for a win.

If I use a lot size calculator for each trade and input each pair and price etc… if I was to input that a 20Pip SL = 2.5% Loss on Balance… then each trade would have a different lot size to end up with the same roughly 2.5% loss or win on each trade.

Overall, is it better to do that or will things just average out over the long-term anyway?

Hope that makes sense… thanks all in advance.

2

That means your risking different amounts for each trade.
It would be smarter to keep the same risk based position size for each trade. What if you had a win at 1%, then a loser at -1.5%? My personal opinion is that its better to keep risk the same for each trade and keep things consistent, therefore I would use a position calculator.