A lot of users want a quick SIP calculator. I have used Widgets Code website to embed this SIP calculator.
You need to enter the monthly investment amount, interest rate, compounding period (for SIP it should be monthly). And total period (in months) till you want to continue the SIP. The calculator will return maturity value at the end of your SIP period.
I hope this helps you plan your early retirement better and decide the retirement corpus.