Loan Amortization Schedule Generator

Calculate your loan repayment schedule with extra payments. Visualize interest savings and pay-off timeline.

How Amortization Works: Each payment covers interest first, then reduces the principal. Over time, the interest portion decreases while the principal portion increases.

Total amount borrowed
Please enter a valid loan amount (minimum $100)
Annual percentage rate (APR)
Please enter a valid interest rate (0.1% - 50%)
Length of the loan in years
Please enter a valid loan term (1-50 years)
Monthly
Bi-weekly
Weekly
Quarterly
Annually
How often you make payments
Date when the loan begins
Optional initial payment (reduces loan amount)
Down payment cannot exceed loan amount
Include Extra Payments
Additional amount to pay each period
Please enter a valid extra payment amount
Begin extra payments after this many periods
Please enter a valid start period
Stop extra payments after this many periods (leave empty for entire loan)
One-time additional payment
Please enter a valid lump sum amount
Mortgage ($300k, 30yr, 6%)
Auto Loan ($35k, 5yr, 4.5%)
Student Loan ($50k, 10yr, 5%)
Personal Loan ($20k, 3yr, 8%)

Understanding Loan Amortization

Loan amortization is the process of paying off a debt over time through regular payments. Each payment covers both interest charges and a reduction of the principal balance.

Amortization Formula:

The monthly payment for a fixed-rate loan is calculated using the formula:

M = P × [r(1+r)ⁿ] / [(1+r)ⁿ - 1]

Where: M = Monthly payment, P = Principal loan amount, r = Monthly interest rate, n = Total number of payments

How Extra Payments Work

1

Reduced Interest: Extra payments directly reduce the principal balance, which decreases the total interest paid over the life of the loan.

2

Shorter Loan Term: By reducing the principal faster, you can pay off the loan sooner than the original term.

3

Compound Savings: The savings compound because each dollar of principal paid early avoids interest charges for the remainder of the loan.

Types of Loans

Loan Type Typical Term Interest Type Common Uses
Mortgage 15-30 years Fixed or Adjustable Home purchase, refinancing
Auto Loan 3-7 years Fixed Vehicle purchase
Student Loan 10-25 years Fixed or Variable Education expenses
Personal Loan 1-7 years Fixed Debt consolidation, major purchases
Business Loan 1-25 years Fixed or Variable Business expansion, equipment

Strategies for Paying Off Loans Faster

  • Bi-weekly payments: Make half-payments every two weeks instead of monthly (results in 13 full payments per year)
  • Round up payments: Round up your payment to the nearest $50 or $100
  • Annual lump sums: Use tax refunds or bonuses to make additional principal payments
  • Refinancing: Consider refinancing to a lower interest rate or shorter term
  • Debt snowball/avalanche: Focus extra payments on highest-interest loans first

Calculator Features:

  • Detailed amortization schedule with date calculations
  • Extra payment analysis showing interest savings
  • Visual charts for payment breakdown and balance over time
  • Yearly summaries for tax planning
  • Export options for CSV, PDF, and printing
  • Comparison between regular and extra payment scenarios

Frequently Asked Questions

Principal is the original amount borrowed. Interest is the cost of borrowing that money, expressed as a percentage of the principal. In the early years of a loan, most of your payment goes toward interest. Over time, more of your payment goes toward reducing the principal.

Extra payments reduce your principal balance faster, which decreases the total interest paid over the life of the loan. This can significantly shorten your loan term. For example, an extra $100 per month on a $250,000 mortgage could save tens of thousands in interest and cut years off your loan.

A 15-year mortgage typically has a lower interest rate and builds equity faster, but the monthly payments are higher. A 30-year mortgage has lower monthly payments but higher total interest costs. You can simulate a 30-year mortgage with extra payments to match a 15-year payoff using this calculator to compare the options.

The main downside is reduced liquidity - once you make an extra payment, you can't get that money back without refinancing or selling the asset. Also, if you have higher-interest debt (like credit cards), it's usually better to pay those off first. Some loans have prepayment penalties, so check your loan agreement.

More frequent payments (bi-weekly or weekly) can reduce your total interest paid and shorten your loan term because you're making payments more often, which reduces the principal balance faster. Bi-weekly payments (every two weeks) result in 26 half-payments per year, which equals 13 full payments instead of 12.