Interest Calculator
See how a starting balance plus regular monthly contributions grows with compounding interest, year by year. An optional tax rate trims the interest earned each year to show realistic after-tax growth.
TheCalculators — Interest Calculator
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Ending Balance
$34,581.90
$10,000 + $100/mo at 6.00% (monthly compounding)
- Starting Balance
- $10,000
- Total Contributions
- $12,000
- Interest Earned
- $12,581.90
- Ending Balance
- $34,581.90
Where the balance comes from
- Starting balance$10,000
- Contributions$12,000
- Interest (net)$12,582
Growth over time
Yearly growth
Most useful next
Formula
Balance = Balance × (1 + r) + contribution each month, where r = annual rate / compounding periods
Pro tips
- • Compounding frequency matters: monthly compounding beats annual at the same nominal rate.
- • Interest on taxable accounts is taxed as ordinary income; retirement accounts usually defer or eliminate that drag.
FAQ
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