# Difference in FD maturity value calculation with bank

**Facing an issue in calculation of maturity value of FD? confused between using year or months or days for calculation? Here, on this page our ISC experts shall provide you the correct formula to calculate the same.**When I used formula(=Principal Amount*((1+Annual Interest Rate/4)^(Total Years of Investment*4))) for calculating FD Maturity value on quarterly basis, there is difference as per in bank maturity value. It has happened only if I taken period of deposit in form of days or months. If I had taken the period in form of YEAR then the calculation is perfect.

Why this is happening when the formula for every form of period is same?

If total year of investment is for 5 year - I will take (5*4/1) - matching with bank maturity value

If total year of investment is for 60 Months - I will take (60*4/12) - NOT matching with bank maturity value

If total year of investment is for 1825 days - I will take (1825*4/365) - NOT matching with bank maturity value

Please need a solution.

Why this is happening when the formula for every form of period is same?

If total year of investment is for 5 year - I will take (5*4/1) - matching with bank maturity value

If total year of investment is for 60 Months - I will take (60*4/12) - NOT matching with bank maturity value

If total year of investment is for 1825 days - I will take (1825*4/365) - NOT matching with bank maturity value

Please need a solution.