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Mortgage Overpayment Calculator

See how extra payments reduce your mortgage term and interest.

Last updated: June 13, 2026

Calculator

Remaining Balance

Interest Rate

Years Remaining

years

Extra Monthly Payment

Results

Interest Saved$89,151

Time Saved6 years, 9 months

New Payoff Time18 years, 3 months

Monthly Payment$2,191

$1,891 base + $300 extra

How to Use This Calculator

1Enter your current loan balance.
2Enter your interest rate and remaining term.
3Enter the extra monthly payment amount.
4View years saved, interest saved, and new payoff date.

Formula Explanation

Extra payments go directly to principal, reducing the balance faster and saving compounding interest over the remaining term.

For each month: New Balance = Balance × (1 + r) - Payment - Extra Years Saved = Original Term - New Term

Variables:

Extra PaymentAdditional amount paid toward principal each month

BalanceCurrent remaining loan balance

RateAnnual interest rate

Worked Examples

$250,000 balance, 6.5%, 27 years left, $200 extra/month

1. Standard payment: ~$1,580/month
2. With $200 extra: pays off in ~20 years
3. Interest saved: ~$78,000

Result: Save 7 years and $78,000 in interest with $200/month extra

$180,000 balance, 7%, 25 years left, $500 extra/month

1. Standard payoff: 25 years
2. With $500 extra: ~13 years

Result: Save 12 years and $112,000 in interest

Why Use This Calculator

See the dramatic impact of small extra payments.
Calculate your exact new payoff date.
Motivates consistent overpayment with real numbers.
Compare different extra payment amounts.

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Tips & Best Practices

Even $100/month extra makes a significant difference over time.
Make sure your lender applies extra payments to principal, not future payments.
Biweekly payments (half payment every two weeks) create one extra payment per year automatically.
Check that your mortgage has no prepayment penalty before overpaying.

Common Mistakes to Avoid

❌ Assuming extra payments shorten the term proportionally.

✅ The savings compound — $200 extra saves more in the first years because it prevents interest on that principal for the entire remaining term.

❌ Not specifying that extra payments go to principal.

✅ Contact your lender to ensure extra payments reduce principal balance, not advance your due date.

Frequently Asked Questions

How much does an extra $100/month save?

On a $250,000 loan at 6.5% over 30 years, an extra $100/month saves approximately $47,000 in interest and pays off the loan 4.5 years early.

Is it better to overpay or invest the extra money?

If your mortgage rate is lower than expected investment returns (historically 7-10% for stocks), investing may earn more. But overpaying provides guaranteed, risk-free savings equal to your mortgage rate.

Can I make a lump sum payment instead?

Yes, most mortgages allow lump-sum principal payments. A single $10,000 payment on a $250K loan at 6.5% can save $20K+ in interest over the remaining term.

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Embed This Calculator

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<iframe src="https://redicalc.com/embed/finance/mortgage-overpayment-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Mortgage Overpayment Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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