Redundancy pay out/ SMP calculations

[badatmaths123]

Hello,
I'm hoping someone can help me, I've been made redundant and I'm heavily pregnant (totally ok with reasons for redundancy, the business is sinking due to Covid)
My employer used a terrible firm to manage the redundancies who gave them entirely the wrong information regarding SMP and I have had to prove that I qualify etc even though I obviously do, so I don't entirely trust anything they say.
I have had my final payslip and I'm not sure I agree with the calculations but I am terrible at maths and don't want to go back and complain then be wrong and look stupid- could anyone check it for me / tell me what it should be? I think SMP (which I got in one lump) is about £300 short and now wondering about the rest.
Or is there a website that will actually do the calculations for me?
Thanks

[badatmaths123]

Yes thanks I've been on there but it's the actual maths of it plus other redundancy bits that I want to check.

[HasaDigaEebowai]

gov.co.uk