Amortization Schedule Calculator

INTRODUCTION

You bought a $300,000 house.

Your monthly payment is $1,996.

You feel good. You can afford it.

After 5 years, you check your balance.

You owe $282,400.

Wait. You paid $120,000 over 60 months.

But your loan only dropped by $17,600.

Where did the other $102,400 go?

It went to interest.

Not principal. Not equity. Not your net worth.

Just interest. Gone forever.

You look at your loan statement.

Payment 1: $1,750 interest, $246 principal.

Payment 12: $1,730 interest, $266 principal.

Payment 60: $1,650 interest, $346 principal.

After 5 years, you still owe 94% of what you borrowed.

This is the brutal truth of amortization.

Banks do not hide it. But they do not advertise it either.

They show you the monthly payment. Not the lifetime cost.

$1,996 per month sounds manageable.

But multiply by 360 months: $718,528.

You paid $418,528 in interest to buy a $300,000 house.

That is 140% of the original price in extra cost.

An amortization schedule calculator exposes this.

It shows you every single payment.

Every dollar of interest. Every dollar of principal.

It shows you the exact month your loan balance finally drops faster than your interest cost.

It shows you how one extra payment per year can save you $80,000.

It shows you why a 15-year loan beats a 30-year loan, even if the monthly payment hurts more.

In 2026, with mortgage rates volatile and home prices at record highs, understanding your amortization schedule is not optional.

It is essential for every homeowner, home buyer, and borrower.

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WHAT IS AN AMORTIZATION SCHEDULE CALCULATOR?

An amortization schedule calculator is a tool that breaks down every single loan payment into principal and interest.

It shows you the full life of your loan — month by month, year by year.

It handles all loan types:

• Fixed-rate mortgages (30-year, 15-year, 20-year)

• Adjustable-rate mortgages (ARM) (rate changes after fixed period)

• Auto loans (5-year, 6-year, 7-year terms)

• Personal loans (fixed term, fixed rate)

• Student loans (standard and extended repayment)

• Home equity loans (second mortgage amortization)

• Commercial real estate loans (balloon vs fully amortizing)

Standard inputs:

• Loan amount (principal borrowed)

• Annual interest rate (APR)

• Loan term (years or months)

• Start date (when payments begin)

• Extra monthly payments (optional)

• Extra annual payments (optional)

• One-time lump sum payments (optional)

Outputs you get:

• Monthly payment amount (P&I only)

• Total interest paid over full term

• Total cost of loan (principal + interest)

• Year-by-year breakdown

• Month-by-month schedule (first 12 months and full table)

• Principal vs interest split for any payment

• Remaining balance after any date

• Payoff date with extra payments

• Interest saved from prepayments

It answers the questions every borrower asks:

"How much interest will I pay in total?"

"What do I actually owe after 5 years?"

"How much does one extra payment save?"

"Should I choose 15-year or 30-year?"

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HOW TO USE THE NUMOVIX AMORTIZATION SCHEDULE CALCULATOR

Our calculator gives you instant, accurate amortization details in under 30 seconds.

Step 1:

Enter your loan amount (purchase price minus down payment).

Example: $300,000

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Step 2:

Enter your annual interest rate (APR).

Example: 7.0%

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Step 3:

Enter your loan term in years.

Example: 30 years

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Step 4:

Enter your start date (optional, for accurate schedule).

Example: January 2026

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Step 5:

Enter extra monthly payment (optional).

Example: $200 extra per month

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Step 6:

Enter extra annual payment (optional).

Example: $1,000 extra per year

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Step 7:

Click "Generate Schedule."

You will instantly see:

Example: $300,000 at 7.0% for 30 years, no extra payments

• Monthly payment: $1,995.91

• Total payments: 360

• Total interest: $418,527.60

• Total cost: $718,527.60

• First payment: $1,750.00 interest, $245.91 principal

• Balance after 1 year: $297,044

• Balance after 5 years: $282,389

• Balance after 10 years: $257,890

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Example: Same loan with $200 extra per month

• Monthly payment: $2,195.91

• Payoff date: ~23 years (7 years early)

• Total interest: ~$301,679

• Interest saved: ~$116,849

• Balance after 5 years: $261,200 (vs $282,389 without extra)

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Example: Same loan as 15-year term

• Monthly payment: $2,696.40

• Total interest: $185,352

• Interest saved vs 30-year: $233,176

• Balance after 5 years: $228,100

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THE MATH BEHIND AMORTIZATION

Understanding the formulas helps you verify your schedule and plan your payoff strategy.

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Monthly Payment Formula:

M = P × [ i(1 + i)^n ] ÷ [ (1 + i)^n − 1 ]

Where:

• M = Monthly payment

• P = Principal loan amount

• i = Monthly interest rate (annual rate ÷ 12)

• n = Total number of payments (years × 12)

Example:

P = $300,000

i = 0.07 ÷ 12 = 0.0058333

n = 30 × 12 = 360

(1.0058333)^360 = 8.119

M = 300,000 × [0.0058333 × 8.119] ÷ [8.119 − 1]

M = 300,000 × 0.04736 ÷ 7.119

M = 300,000 × 0.006652

M = $1,995.91

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Interest for Any Given Month:

Monthly Interest = Current Balance × (Annual Rate ÷ 12)

Example (Month 1):

$300,000 × 0.07 ÷ 12 = $1,750.00

Principal for Month 1:

$1,995.91 − $1,750.00 = $245.91

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Interest for Month 2:

New balance = $300,000 − $245.91 = $299,754.09

$299,754.09 × 0.07 ÷ 12 = $1,748.57

Principal = $1,995.91 − $1,748.57 = $247.34

Notice: Interest drops slightly. Principal rises slightly.

This is the core of amortization. Early payments are mostly interest. Late payments are mostly principal.

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Remaining Balance After Any Payment:

B = P × [ ((1 + i)^n − (1 + i)^p) ÷ ((1 + i)^n − 1) ]

Where p = number of payments already made.

Example (After 5 years / 60 payments):

(1.0058333)^60 = 1.418

B = 300,000 × [ (8.119 − 1.418) ÷ (8.119 − 1) ]

B = 300,000 × [ 6.701 ÷ 7.119 ]

B = 300,000 × 0.9413

B = $282,390

After paying $119,755 over 5 years, you only reduced principal by $17,610.

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Effect of Extra Payments:

Extra payments go directly to principal.

They do not reduce next month's minimum payment.

They shorten the loan term and eliminate future interest.

Example: $200 extra per month

New effective payment = $2,195.91

Months to payoff = ~274 (instead of 360)

Total interest = ~$301,679

Savings = $116,849

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Complete Real Example:

Alex Buys a Home:

Loan details:

• Purchase price: $375,000

• Down payment: $75,000 (20%)

• Loan amount: $300,000

• Rate: 7.0% fixed

• Term: 30 years

• Start: January 2026

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Option 1: Standard 30-Year Payment

• Monthly P&I: $1,995.91

• Total interest: $418,528

• Total cost: $718,528

• First year interest: $20,936

• First year principal: $2,015

• Break-even point (50% principal/interest): Payment #282 (Year 23.5)

Alex realizes: For the first 10 years, he pays more interest than principal.

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Option 2: 15-Year Term

• Monthly P&I: $2,696.40

• Total interest: $185,352

• Interest saved: $233,176

• Total cost: $485,352

Monthly increase: $700.49

But Alex saves $233,176 and owns home free and clear in 15 years.

At age 35, he is mortgage-free by 50.

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Option 3: 30-Year with Extra Payments

Alex keeps 30-year for flexibility but pays $2,500/month ($504.09 extra).

• Payoff: ~22 years (8 years early)

• Total interest: ~$280,000

• Interest saved: ~$138,000

• Balance after 5 years: $254,000 (vs $282,389 standard)

Best of both worlds: Lower mandatory payment if emergency hits, but aggressive payoff when possible.

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Year-by-Year Breakdown (Standard 30-Year):

| 1 | $300,000 | $20,936 | $2,015 | $297,985 |

| 2 | $297,985 | $20,794 | $3,157 | $294,828 |

| 3 | $294,828 | $20,634 | $4,317 | $290,511 |

| 5 | $286,600 | $20,264 | $6,687 | $282,389 |

| 10 | $264,500 | $18,850 | $11,101 | $257,890 |

| 15 | $236,200 | $16,700 | $16,251 | $227,200 |

| 20 | $199,400 | $13,750 | $22,201 | $185,600 |

| 25 | $150,200 | $10,100 | $28,851 | $129,700 |

| 30 | $47,200 | $1,650 | $47,200 | $0 |

Notice: In Year 1, 91% of your payment is interest.

In Year 30, 99% of your payment is principal.

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WHY EVERY HOMEOWNER NEEDS AN AMORTIZATION CALCULATOR

1. See the True Cost of Borrowing

$300,000 house at 7% = $418,528 in interest.

That is not a footnote. That is more than the house itself.

The calculator makes this impossible to ignore.

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2. Plan Prepayment Strategy

Got a $5,000 bonus?

Calculator shows exactly how many months it shaves off.

Got $200/month extra?

Calculator shows $116,849 saved.

Without the schedule, you are guessing.

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3. Compare Loan Terms Honestly

30-year: $1,996/month, $418,528 interest.

15-year: $2,696/month, $185,352 interest.

Difference: $700/month saves $233,176.

Is $700/month worth $233,000?

Calculator gives you the real numbers to decide.

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4. Decide Whether to Refinance

Current loan: 7.0%, 25 years remaining.

Refinance offer: 6.0%, 30 years.

Payment drops $200/month.

But term resets to 30 years.

Total interest: Higher than keeping current loan.

Calculator exposes this trap.

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5. Track Equity Growth

Want to know when you hit 20% equity to remove PMI?

Calculator shows exact balance by month.

Plan your PMI removal date.

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6. Budget for the Future

Year 1: $1,750/month interest (tax deductible).

Year 15: $1,100/month interest.

Tax benefit shrinks over time.

Calculator helps you plan tax strategy.

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KEY FACTORS THAT AFFECT YOUR AMORTIZATION SCHEDULE

Interest Rate:

7% vs 6% on $300,000/30-year:

• 7%: $1,996/month, $418,528 interest

• 6%: $1,799/month, $347,515 interest

1% lower = $71,013 saved.

Rate is the biggest lever.

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Loan Term:

30-year vs 15-year:

• 30-year: Lower payment, massive interest.

• 15-year: Higher payment, massive savings.

Shorter term = less time for interest to compound.

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Down Payment:

20% down = no PMI.

Less than 20% = PMI adds $100–$400/month.

Also: smaller loan = less interest.

$50,000 extra down payment on $300,000 loan:

Saves ~$69,000 in interest over 30 years.

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Extra Payments:

Even small amounts destroy amortization schedules in your favor.

$100/month extra on $300,000/7%:

• Payoff: ~26 years (4 years early)

• Interest saved: ~$62,000

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PMI (Private Mortgage Insurance):

Required if down payment < 20%.

Does not reduce principal. Does not build equity.

Pure cost. Calculator shows when you can cancel it (usually 20–22% equity).

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Escrow (Taxes and Insurance):

Often included in monthly payment.

Not part of amortization schedule (not principal or interest).

But affects total monthly outflow.

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COMMON MISTAKES BORROWERS MAKE

Mistake 1: Focusing Only on Monthly Payment

"I can afford $2,000/month."

Yes, but over 30 years that is $718,000.

A car dealer or mortgage broker sells you on payment, not total cost.

Calculator reveals the lifetime damage.

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Mistake 2: Ignoring the First 10 Years

You think you are building equity.

After 10 years on $300,000/7%, you owe $257,890.

You paid $239,509. Equity gained: $42,110.

82% of your money went to interest.

You barely own your house after a decade.

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Mistake 3: Refinancing to Lower Payment but Extending Term

You have 22 years left. You refinance to 30 years at lower rate.

Payment drops $300/month.

But you pay 8 more years and $50,000+ more interest.

You did not save money. You borrowed time.

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Mistake 4: Not Making Extra Payments Early

Extra payments in Year 1 eliminate 29 years of future interest.

Extra payments in Year 20 eliminate only 10 years of interest.

Early extra payments have exponentially more impact.

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Mistake 5: Choosing ARM for Lower Initial Rate

5/1 ARM at 5.5% looks cheaper than 7% fixed.

But after Year 5, rate adjusts to 8.5%.

Amortization schedule resets with higher rate.

Payment jumps. Equity building stalls.

Calculator shows both scenarios.

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Mistake 6: Not Removing PMI on Time

You hit 20% equity. PMI should stop.

But lender continues charging $150/month.

Over 3 extra years: $5,400 wasted.

Calculator shows exact equity date. Demand cancellation.

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Mistake 7: Paying Off Low-Interest Debt Instead of Investing

Mortgage at 4%. Market returns 8%.

Paying extra on mortgage "saves" 4%.

Investing earns 8%.

Calculator shows opportunity cost.

Sometimes investing beats prepaying.

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PRO TIPS TO PAY OFF YOUR LOAN FASTER

Tip 1: Make One Extra Payment Per Year

$1,996 extra once per year on $300,000/7%:

• Payoff: ~26 years (4 years early)

• Interest saved: ~$65,000

Easiest method: Divide monthly payment by 12. Pay $166 extra each month.

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Tip 2: Switch to Biweekly Payments

Half payment every 2 weeks = 26 half-payments = 13 full payments per year.

One extra payment per year without feeling it.

Same impact as Tip 1.

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Tip 3: Round Up to the Nearest Hundred

Payment is $1,995.91? Pay $2,100.

$104.09 extra per month.

Shaves ~3 years and ~$45,000 in interest.

Painless wealth building.

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Tip 4: Put Windfalls Directly to Principal

Tax refund: $3,000.

Bonus: $5,000.

Inheritance: $10,000.

Do not spend. Do not invest. Do not save.

If mortgage rate > 6%, pay principal.

$10,000 lump sum on $300,000/7% at Year 1:

Saves ~$47,000 in interest and pays off ~2.5 years early.

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Tip 5: Refinance to Shorter Term, Not Lower Payment

If rates drop and you can afford it:

Refinance 30-year to 15-year.

Payment rises, but term collapses.

You save 6 figures in interest.

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Tip 6: Avoid PMI with 20% Down

If you can swing it, 20% down eliminates PMI permanently.

On $375,000 house: $75,000 down.

PMI at $200/month for 8 years = $19,200 saved.

Plus smaller loan = less interest.

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Tip 7: Recast Instead of Refinance

Got $50,000? Instead of refinancing, ask lender to recast (re-amortize).

Fee: ~$250–$500.

Keeps same rate and term. Reduces monthly payment.

No credit check. No closing costs.

Cheaper than refinancing for lump sum impact.

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QUICK SUMMARY

Before you use the calculator, remember these key points:

• Amortization front-loads interest — early payments are mostly interest

• After 5 years on a 30-year loan, you often paid more in interest than principal reduction

• Total interest on a 30-year mortgage can exceed the original loan amount

• Extra payments destroy principal and save exponentially more than the extra amount

• 15-year loans save massive interest but require higher monthly payments

• Refinancing to a longer term usually costs more despite lower payments

• PMI is wasted money — aim for 20% down or remove it ASAP

• Biweekly payments create one extra payment per year painlessly

• Recasting is cheaper than refinancing for lump sum reductions

• Early extra payments matter most — Year 1 extra beats Year 20 extra

• Always look at total interest, not just monthly payment

• Your amortization schedule is your roadmap to debt freedom

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FREQUENTLY ASKED QUESTIONS

Q1: What is an amortization schedule?

A table showing every loan payment broken into:

• Interest portion (goes to lender)

• Principal portion (reduces your balance)

• Remaining balance

It shows the full life of your loan from first payment to last.

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Q2: How do I calculate my monthly mortgage payment?

Use the formula:

M = P × [ i(1+i)^n ] ÷ [ (1+i)^n − 1 ]

Or use our calculator. Enter loan amount, rate, and term. Instant result.

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Q3: Should I pay extra toward principal?

Yes, if your mortgage rate > expected investment return.

At 7% mortgage, paying extra earns you a guaranteed 7% return (risk-free).

At 4% mortgage, investing in index funds at 8% may be better.

Depends on rate, risk tolerance, and peace of mind.

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Q4: Does an extra payment reduce my monthly payment?

No. It reduces your balance and payoff date.

Your required monthly payment stays the same.

But loan ends sooner. You save all future interest on that principal.

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Q5: What is PMI and when can I remove it?

Private Mortgage Insurance. Required if down payment < 20%.

Cost: 0.3%–1.5% of loan amount annually.

Can usually remove when you reach 20% equity (80% loan-to-value).

Some loans require automatic removal at 22% equity.

Check your loan terms. Use calculator to track equity.

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Q6: What is the difference between 15-year and 30-year amortization?

15-year: Higher payment, much less interest, faster equity.

30-year: Lower payment, much more interest, slower equity.

Example $300,000 at 7%:

• 30-year: $1,996/month, $418,528 interest

• 15-year: $2,696/month, $185,352 interest

$700 more per month saves $233,176.

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Q7: Does refinancing restart my amortization?

Yes, if you refinance to a new 30-year term.

You go back to Payment 1: mostly interest, barely principal.

That is why refinancing to a shorter term or same remaining term is often smarter.

Calculate total interest before and after. Do not just look at monthly payment.

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RELATED CALCULATORS

Explore our full suite of free financial tools:

• Mortgage Calculator

• Refinance Calculator

• Debt-to-Income Ratio Calculator

• Home Affordability Calculator

• Loan Payoff Calculator

• Interest-Only Mortgage Calculator

• Biweekly Payment Calculator

• Property Tax Calculator

• Rent vs Buy Calculator

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FINAL THOUGHTS

A mortgage is not just a monthly payment.

It is a 30-year wealth transfer from you to the lender.

In the first 5 years, you pay them $102,000 in interest and keep $17,000 in equity.

That is not a partnership. That is a structured extraction.

But knowledge is power.

The amortization schedule calculator shows you exactly how the extraction works.

It shows you which payments are poison.

It shows you which payments build your net worth.

It shows you how $200 extra per month flips the script and saves $116,000.

Every borrower who understands their amortization schedule makes better decisions.

They choose 15-year terms when they can afford it.

They throw bonuses at principal instead of buying toys.

They refuse to refinance into longer terms.

They remove PMI the day they hit 20% equity.

They do not let the bank win by default.

They fight back with math.

Before you sign any loan, generate the amortization schedule.

Look at the total interest number.

Let it shock you.

Then let it motivate you.

That number is not fixed. It is negotiable — through prepayment, shorter terms, and smarter choices.

Every dollar of principal you pay early is a bullet fired at your loan.

Use the calculator. Arm yourself. Pay off your debt.

That is how you build real wealth.

That is how you own your home instead of the bank owning you.

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DISCLAIMER

This article is for educational and informational purposes only.

Mortgage rates, loan terms, and lending policies change frequently and vary by lender, location, credit profile, and loan type.

The examples provided are illustrative and based on approximate 2026 mortgage standards for the United States.

Actual amortization depends on:

• Your specific interest rate and loan terms

• Lender fees and policies

• PMI requirements

• Property taxes and insurance (escrow)

• Prepayment penalties (if any)

• Current market conditions

Always verify current rates and terms directly with lenders, mortgage brokers, or financial advisors before making borrowing or refinancing decisions.

Numovix does not provide financial, legal, or mortgage advice.

Our calculator results are estimates and should be verified with your lender's official amortization schedule and professional guidance before making any financial commitment.

Loan terms and regulations vary by jurisdiction — consult local laws and qualified professionals regarding your specific situation.

Amortization Schedule Calculator | Mortgage & Loan Payment Breakdown | Numovix

Free amortization schedule calculator. See exactly how much of each payment goes to principal vs interest. Calculate total loan cost, plan prepayments, and pay off your mortgage faster. No signup needed.