Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
What income do you each have?
What do you propose to do with the pensions?
What income can she earn
How long has she lived together and how old are the children?
You are correct - the starting point for the division of all the assets is 50/50 - including the pensions - considering the length of your relationship.
You have used the Child Maintenance calculator, which only leaves the issue of spouse maintenance.
The considerable difference in your income (and income capacity) means that she has a claim for spouse maintenance - it is based on her "reasonable needs" - a hard one to assess - but the extra capital you are offering certainly releases you from that risk - but you may still need to offer a Pension Sharing Order.
Once you have a greed it you need to ensure that it is turned either into a separation agreement - or (better) a consent order within Divorce Proceedings
Please ask if you need further details
You are welcome - I hope all goes well