Mortgage interest/repayment calculations - help needed please.

T_J_A_8691

Good morning,
Im trying to find out the balance of my mortgage and how much approximately we are paying off the capital each month and how much interest. (i have email the building society but the advisor has stated they cant give this info as it changes each month)
So im hoping someone on here would be able to advise.
Mortgage £152000 3.39 fixed for 2 years.
Mortgage statement at 31st October =£147,694.88 We had overpaid but not much.
Mortgage paid on the 22nd of each month.
Since 31st Of October we have over paid £50 in Nov + Dec then £900 Jan and £300 Feb. (unsure how these work etc for interest )
Looking at potentially moving in September so trying to work out how much we would need to save and if it is realistic.
Many thanks for reading.

getmore4less

Amortization is the thing you need to look up.
this calculator does the basics  look at the detail for month by month.
http://www.whatsthecost.com/mortgage.aspx

for something with a bit more  to look at overpayments try
https://forums.moneysavingexpert.com/discussion/1157173/my-excel-mortgage-spreadsheet/p1
http://www.locostfireblade.co.uk/spreadsheet/Index.html

clueless_but_curious

To estimate daily interest use most recent statement balance and multiply by rate/365
i.e. 147694.88 x (0.0339/365) = interest per day.
Difference between your total payment and the interest up to the date of the payment is the repayment of capital  
When you overpay, you are further reducing your statement balance and therefore reducing your daily interest from when overpayment is made