Hi
Im sure this has been brought up before but i just don't get it. I've googled it and my pea sized brain can't work it out! Wish there was a simple calculator that could help you work out the take home SMP after tax and NI. Can anyone help work it out, as i am panicking im not going to be able to afford my mortgage and car when baby is born. I'm not with the father but he would be in the picture and i dont qualify for benefits! 
So baby is due 31st May 2020.
Tax Code 1244L
Monthly Pay £3029.17 before deductions, £2492 after deductions.
Roughly works out at £757 per week, £623 per week after deductions.
Based on the above how on earth do i calculate take home SMP, also note it will be 1 month into the new tax year.
Help!!! Thank YOU