Let Principal = P, Rate = R% per annum, Time = n years.

When interest is compound Annually:

When interest is compounded Half-yearly:

When interest is compounded Quarterly:

When interest is compounded Annually but time is in fraction, say 3 years.

When Rates are different for different years, say R_{1}%, R_{2}%, R_{3}% for 1^{st}, 2^{nd} and 3^{rd} year respectively.

Present worth of Rs. x due n years hence is given by: