Tools
Finance & Money
Compound Interest Calculator
A = P(1 + r/n)^(nt) — watch money compound over time
Compound Interest
A = P(1 + r/n)^(nt)
Result appears here
How it works
→ Understand your resultsHow it works
The formula
A = P(1 + r/n)^(nt)
A = P(1 + r/n)^(nt)
- AFinal amount
- PPrincipal
- rAnnual rate (decimal)
- nTimes compounded per year
- tTime in years
Rule of 72
Estimate years to double your money
Years to double ≈ 72 ÷ rate%
At 8%: 72 ÷ 8 = 9 years
Frequency matters
$10,000 at 10% for 10 years
- Annually$25,937
- Monthly$27,070
- Daily$27,179
How it works▾
→ Understand your results
How it works
The formula
A = P(1 + r/n)^(nt)
A = P(1 + r/n)^(nt)
- AFinal amount
- PPrincipal
- rAnnual rate (decimal)
- nTimes compounded per year
- tTime in years
Rule of 72
Estimate years to double your money
Years to double ≈ 72 ÷ rate%
At 8%: 72 ÷ 8 = 9 years
Frequency matters
$10,000 at 10% for 10 years
- Annually$25,937
- Monthly$27,070
- Daily$27,179