How to Calculate Savings Interest
What is Savings Interest?
A savings interest calculator computes how much interest your savings will earn over time, accounting for the annual interest rate, compounding frequency, and any regular contributions. The power of compound interest grows money exponentially over long periods.
Step-by-Step Guide
- 1Enter your principal (initial deposit), interest rate, and time period
- 2Select compounding frequency: daily, monthly, quarterly, or annually
- 3For regular contributions: each deposit is compounded from when it is made
- 4Future value = P(1 + r/n)^(nt) + PMT × [(1+r/n)^(nt)−1] / (r/n)
Worked Examples
Input
£5,000 at 4.5% annual for 10 years (monthly compounding)
Result
£7,807
£2,807 interest earned
Input
£100/month for 20 years at 5%
Result
£41,103
£17,103 earned on £24,000 contributed