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CalcWolf Finance Calculadora de Amortización
Finance

Loan Amortization Schedule

Generate a full amortization table. See principal vs interest breakdown for each payment over the life of any loan.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

Understanding Amortization

Amortization spreads loan repayment over fixed monthly payments covering both principal and interest. Early payments are mostly interest — on a $300K mortgage at 6.5%, your first $1,896 payment puts only $271 toward principal and $1,625 toward interest. This ratio gradually inverts over the life of the loan.

The Power of Extra Payments

Extra payments go entirely to principal. An additional $200/month on a $300K mortgage at 6.5% saves over $100,000 in interest and cuts 8+ years off the loan. The earlier you start making extra payments, the bigger the impact.

⚡ CalcWolf Insight

On a 30-year mortgage at 6.5%, you do not pay off half the principal until year 22. For 22 years, more than half of every payment is interest. This is why refinancing to a lower rate or making extra payments early has such outsized impact.

Frequently asked questions
What is an amortization schedule?
A table showing every payment over a loan life, broken into principal and interest portions. It shows how your balance decreases with each payment and how the principal-to-interest ratio shifts over time.
Why is so much of my early payment interest?
Interest is calculated on the remaining balance. When the balance is high (early in the loan), the interest charge is large. As you pay down the balance, less interest accrues, so more goes to principal.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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