📈 Free Online Compound Interest Calculator
Calculate investment growth and compare multiple scenarios with real-time visualization
📊 Investment Details
📊 Results
Final Amount
$0.00
Total Invested
$0.00
Interest Earned
$0.00
Effective Annual Rate
0.00%
📈 Investment Growth Over Time
💾 Saved Scenarios
📖 How Compound Interest Works
Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods.
The formula used is:
A = P(1 + r/n)nt + PMT × [((1 + r/n)nt - 1) / (r/n)]
A = Final amount
P = Initial principal
r = Interest rate (as decimal)
n = Number of times interest is compounded per year
t = Number of years
PMT = Regular contribution amount
A = P(1 + r/n)nt + PMT × [((1 + r/n)nt - 1) / (r/n)]
A = Final amount
P = Initial principal
r = Interest rate (as decimal)
n = Number of times interest is compounded per year
t = Number of years
PMT = Regular contribution amount
✨ Features
- ✅ Real-time compound interest calculations with instant results
- ✅ Support for annual, monthly, and daily interest rates
- ✅ Multiple compounding frequency options (annually to daily)
- ✅ Regular contribution support for ongoing investments
- ✅ Interactive growth chart with timeline controls
- ✅ Save and compare multiple investment scenarios
- ✅ Scenario history for easy comparison
- ✅ Fully responsive design for all devices
- ✅ No personal data collected - all calculations done locally