Free Compound Interest Calculator — Watch Your Money Grow
~30 seconds
Compound interest is the engine behind long-term wealth — interest earned on interest. Enter your starting amount, rate, compounding frequency, and time horizon to see exactly how your money grows.
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Examples
Annual compounding
Principal: $10,000 | Rate: 8% | Compounding: annually | Years: 10
Calculation
- Formula: A = 10,000 × (1 + 0.08/1)^(1×10)
- A = 10,000 × (1.08)^10
- A = 10,000 × 2.1589
- A = $21,589.25
Total value: $21,589.25
Interest earned: $11,589.25
Monthly compounding
Principal: $5,000 | Rate: 6% | Compounding: monthly | Years: 5
Calculation
- Formula: A = 5,000 × (1 + 0.06/12)^(12×5)
- Monthly rate: 0.5% per month
- A = 5,000 × (1.005)^60
- A = $6,744.25
Total value: $6,744.25
Interest earned: $1,744.25