Loan & Mortgage Calculator
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An advanced loan calculator handles complex scenarios: variable interest periods, multiple fees, balloon payments, biweekly payments, and extra payment analysis. Useful for comparing real-world loan offers with different structures.
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Tip: Before agreeing to biweekly payments through a lender service, check if they charge a fee. You can achieve the same result for free by adding 1/12 of your monthly payment to each regular monthly payment.
- 1Biweekly payments: 26 payments/year instead of 24 (2× monthly) — makes 1 extra monthly payment per year
- 2Balloon loan: lower monthly payments for set term, then large lump-sum payment at end
- 3Interest-only period: payments only cover interest, principal unchanged
- 4Origination fees: added to principal or paid upfront (affects true cost)
| Structure | Monthly/Period Payment | Total Interest | Payoff |
|---|---|---|---|
| Standard monthly | $1,996 | $418,527 | 30 years |
| Biweekly (same total) | $998 | $418,527 | 30 years |
| Biweekly (extra payment effect) | $998 | $376,000 | 25.6 years |
| Extra $200/month | $2,196 | $349,000 | 25.7 years |
| Interest-only (10yr) then amortize | Varies | Much higher | 30+ years |
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Fun Fact
Biweekly mortgage payments work because 26 biweekly payments = 13 monthly payments, effectively making one extra monthly payment per year. On a $300k/7%/30yr loan, this saves ~$42,000 in interest and pays off 4.5 years early.
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