How to calculate leverages relating to open positions?

Hi.
I want a simple way to calculate open positions relating to leverage.

For example,

I use 1:50 leverage.

If I use all money = I use 1:50 leverage.
If I use part of my money = part of 50 = Ex. 1:30 = less leverage.

I want a formular to calculate this. Anyone can tell me?

Thanks.

Position size divided by account balance.

Open 1 standard lot (100k) with a 10K account balance and you are leveraged 10:1. 100k divided by 10k = 10

Open 5 minilots (50k) with a 10k account and you are leveraged 5:1.
50k divided by 10k = 5.

what bill said