Compound Interest Calculator
Enter your starting balance, annual return, term, and optional monthly contributions.
Future value
SAR 300,851
- Contributed
- SAR 130,000
- Interest earned
- SAR 170,851
How it works
Interest earns interest each period, so your balance grows faster the longer you stay invested.
Formula
FV = P · (1 + r/n)^(n·t) + PMT · ((1 + rm)^m − 1) / rm
Worked example
SAR 10,000 + SAR 500/month at 7% for 20 years ≈ SAR 299,000.
FAQ
- Simple vs compound?
- Simple interest is on principal only; compound earns interest on past interest too.
- How often is it compounded?
- Defaults to monthly (12×/yr). More frequent compounding slightly raises returns.
- Does it include inflation?
- No — results are nominal. Subtract inflation to estimate real return.