How to calculate compound interest total amount from principal, interest rate and time period?

Here's an example: We are looking for the final amount after compound interest. Using the formula A = P × (1 + r)^t, where A is future value, P is principal amount, r is annual interest rate (as decimal), and t is number of years. For $1000 at 5% for 3 years: A = $1000 × (1 + 0.05)^3 = $1000 × 1.157625 = $1157.63.

Compound Interest - How much will my savings grow over time?

I put $ into an account earning % interest annually. If I leave it for years...
How much will I have in total?

Contextual hints will appear here as you calculate

Incomplete data. Enter all required values to see the calculations.

Answer: After 3 years, I'll have $ . That includes $ in earned interest.

Round calculations to 2 decimal places

Type of calculation: Calculating compound interest.
How to use the calculator: Since there isn't a dedicated "Compound Interest CALCULATOR" in our list, use a scientific or financial calculator. You can also use Excel or Google Sheets and the FV (Future Value) function.
The formula:
We want the final amount after 3 years with annual compounding.
General formula: A = P × (1 + r/n)^(n×t)

A – future value
P – principal amount
r – annual interest rate (as a decimal)
n – number of times interest is compounded per year
t – number of years

Since compounding is annual (n=1), the formula simplifies to: A = P × (1 + r)^t
Given:

P = $1000
r = 5% = 0.05
t = 3 years
n = 1 (annual compounding)

Calculation:
A = $1000 × (1 + 0.05/1)^(1×3)
A = $1000 × (1 + 0.05)^3
A = $1000 × (1.05)^3
A = $1000 × 1.157625 = $1157.63
Interest earned: Interest = A - P = $1157.63 - $1000 = $157.63