The UC you will get will be very personal to your circumstances e.g how many children you have, if any of them are disabled, where you will be living - will there be rent payments, will you have any savings or other capital etc. There are a few online checkers you can use detailed here where you answer the questions based on what your circumstances will be or you could try and contact your local Citizens Advice for a check if struggling to understand the online calculations https://www.citizensadvice.org.uk/benefits/benefits-introduction/what-benefits-can-i-get/
2 kids, with rent about £725 before my childcare reimbursements is roughly £1600, it maybe more I can't remember.
Go on the turn2us calculator x
You need to find out your local housing rate (what UC would contribute towards your rent) and then I used a calculator as if I already had a rented house. Eg found one for £700 rent so I just put that in the calculator to work out what support I’d get.
I believe you can use a benefits calculator to get an estimate of what you would be entitled to, if you Google universal credit benefits calculator, I’m not sure how accurate it is to what you actually receive though x