The formula
EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1), where P is the loan amount, r the monthly interest rate (yearly rate ÷ 12) and n the number of monthly payments.
Shorter or longer term?
A longer term lowers the monthly payment but raises the total interest. Try both in the calculator to see the difference before you decide.