Free Amortization Calculator
Year-by-year principal, interest, and remaining balance schedule.
- Free Forever
- No Registration Required
- Instant Results
- Downloadable Reports
- Mobile Friendly
Inputs
Result
Monthly payment
$1,580.17
Your result is ready.
Download your free detailed report — inputs, result, formula and explanation included.
Estimates only. Verify with a professional for consequential decisions.
- Always Free
- No Hidden Costs
- No Account Required
- Unlimited Calculations
- Instant Reports
Short answer
Each payment covers this period's interest first (balance × monthly rate) and applies the remainder to principal. Early payments are mostly interest; late payments are mostly principal.
What is the Amortization Calculator?
The month-by-month decomposition of every loan payment into interest and principal, plus the remaining balance.
How does the Amortization Calculator work?
Multiply the current balance by the monthly rate for this month's interest. Subtract from the payment to get principal. Subtract principal from balance. Repeat.
Formula
Variables
rMonthly ratePMTFixed monthly payment
Explanation
Iterating this recurrence for every period generates the full amortization schedule.
Examples
Example 1: $250k, 6.5%, 30 yr
First payment: $1,354 interest / $226 principal. Year 15: about half principal, half interest.
Applications
- Understanding mortgage payoff dynamics
- Refi break-even math
- Extra-payment strategy planning
Advantages
- Reveals early-year interest concentration
- Enables informed refinance and prepayment decisions
Limitations
- Assumes fixed rate — ARMs need per-period rate resets
Common mistakes
- Assuming payments are 50/50 interest/principal from day one
Tips
- Every dollar of early principal saves years of future interest
Related concepts
The Amortization Calculator sits inside the Finance Calculators hub, in the loans & debt payoff cluster. Instalment borrowing, credit cards and payoff strategy. Understanding the terms below makes the output easier to interpret and easier to compare against neighbouring measures.
Practical use cases and industry applications
Understanding Amortization
The month-by-month decomposition of every loan payment into interest and principal, plus the remaining balance. Within finance calculators, amortization belongs to the loans & debt payoff cluster, where it shares terminology and assumptions with closely related tools.
Learning how amortization is calculated
Iterating this recurrence for every period generates the full amortization schedule. Working through the variables one at a time — r, PMT — makes the result reproducible by hand and easier to sanity-check.
Using amortization to make a decision
Understanding mortgage payoff dynamics Refi break-even math Extra-payment strategy planning Because outputs depend on the assumptions you enter, run more than one scenario before committing to a figure.
How amortization compares with related measures
principal, APR, term, avalanche method all describe adjacent aspects of loans & debt payoff. Comparing this calculator's output against those measures — using the related tools listed on this page — prevents a single metric from being read in isolation.
Frequently asked questions
Why is my early payment mostly interest?
Because interest is charged on the full remaining balance, which is largest in year one.
Related calculators
These tools share entities, formulas or user intent with the amortization calculator.
Financial
Free APR Calculator
True annual percentage rate on a loan with fees.
Financial
Free Loan Calculator
Compute the fixed monthly payment on any amortizing loan.
Financial
Free Mortgage Calculator
Estimate your monthly mortgage payment, total interest, and payoff schedule.
Financial
Free Auto Loan Calculator
Monthly car payment from price, down payment, trade-in, and sales tax.
Financial
Free Boat Loan Calculator
Estimate monthly payments on a boat loan.
Financial
Free Business Loan Calculator
Payment and interest cost for a business term loan.
Financial
Free Loan Extra Payment Calculator
Interest and time saved by paying extra on a loan (EMI).
Financial
Free Personal Loan Calculator
Monthly payment and total cost for a personal loan.
Financial
Free RV Loan Calculator
Monthly payment for a recreational vehicle loan.