What is formula for calculate maturity amount?

The maturity amount for a fixed deposit or investment can be calculated using the formula:

[ A = P(1 + r/n)^{nt} ]

where ( A ) is the maturity amount, ( P ) is the principal amount (initial investment), ( r ) is the annual interest rate (in decimal), ( n ) is the number of times interest is compounded per year, and ( t ) is the number of years the money is invested or borrowed. For simple interest, the formula is ( A = P(1 + rt) ).