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Extra Mortgage Payment Calculator

See exactly how different extra payment amounts compare, side by side, so you can pick the strategy that fits your budget.

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This page is part of our Complete Mortgage Guide 2026.
Base monthly payment
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Total interest, no extra
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Why compare scenarios side by side

The relationship between extra payment size and total savings is not linear — doubling your extra payment more than doubles your interest savings, because you are compounding the effect earlier in the loan. Comparing several amounts side by side makes it easy to find the sustainable sweet spot for your budget.

This calculator automatically compares $50, $100, $200, $300 and $500 extra monthly payments against your base loan, showing payoff time and interest saved for each.

Choosing a sustainable amount

The best extra payment amount is one you can maintain every month without strain — a smaller, consistent extra payment reliably outperforms a larger one you abandon after a few months. If your budget is tight, even $50-$100/month produces meaningful savings over a 30-year term.

Biweekly payments: a common alternative strategy

Splitting your monthly payment into biweekly half-payments results in 26 half-payments per year — the equivalent of one extra full monthly payment annually, without a separate line-item decision each month. Confirm your servicer applies biweekly payments correctly, since some simply hold them and apply monthly regardless.

Related tools

For a payoff date based on your current remaining balance rather than a new loan, use the Mortgage Payoff Calculator. See the full schedule in the Amortization Calculator.

Frequently asked questions

How much should I pay extra on my mortgage each month?
Whatever amount you can sustain consistently without straining your budget or skipping retirement contributions. Even $100/month on a $360,000 loan at 6.8% saves tens of thousands in interest and cuts years off the term.
Is $100 extra a month worth it on a mortgage?
Yes — on a typical 30-year loan, a consistent $100/month extra payment commonly saves $30,000-$50,000+ in interest and shortens the term by 4-6 years, depending on the loan size and rate.
What is the difference between extra monthly payments and biweekly payments?
Biweekly payments (half your monthly payment every two weeks) result in 26 half-payments annually — equivalent to one extra full monthly payment per year, achieved automatically rather than as a separate monthly decision.
Does a bigger extra payment always save proportionally more?
Extra savings scale faster than the extra payment amount, since each additional dollar of principal paid earlier eliminates more total future interest. Doubling your extra payment typically more than doubles your interest savings.
Can I stop making extra payments if my budget changes?
Yes. Extra payments are voluntary and can be paused or resumed at any time without penalty on most standard mortgages — confirm your specific loan has no prepayment penalty, which is rare but does exist on some loan types.
Related tools
→ Mortgage Payoff Calculator→ Amortization Calculator→ Mortgage Calculator→ Refinance Calculator