You already have a mortgage
Mortgage management calculators
See amortization, payoff, extra payments, recasts, points, and rate-adjustment scenarios.
Mortgage management calculators
8 calculators
About these calculators
These tools are for a mortgage you already hold. The question is no longer whether you can borrow, but what the loan does over time and which changes actually shorten it or lower what it costs.
Amortization is the ground the rest sits on: every payment splits between interest on the outstanding balance and principal that reduces it, and early on that split is heavily weighted to interest. Extra payments, biweekly schedules, recasts, and points are all different ways of moving that split, and each one is modelled separately below.
Which tool answers what
| Calculator | What it estimates |
|---|---|
| Mortgage Amortization Calculator | See the full payment schedule for a fixed-rate mortgage: how much of each payment goes to interest and to the balance, and when it is paid off. |
| Mortgage Payoff Calculator | Estimate when the mortgage is paid off, how much interest is left, and how a regular extra payment toward the balance changes both. |
| Mortgage Extra Payment Calculator | Compare the same mortgage with and without a regular extra payment put straight toward the balance. |
| Biweekly Mortgage Calculator | Compare monthly payments with payments every two weeks on the same loan, and see the modeled difference in interest and payoff time. |
| Mortgage Recast Calculator | See how the monthly payment changes if you pay a lump sum toward the balance and the lender recalculates it over the same time to repay. |
| Interest-Only Mortgage Calculator | See the lower payment during the interest-only years, the higher payment once you start repaying the balance, and the total interest cost. |
| ARM Calculator | See three payments for an adjustable-rate mortgage (ARM): the starting fixed payment, the payment after the first rate change, and the capped worst case. |
| Mortgage Points Calculator | Compare a mortgage with and without discount points: what points cost up front, how much the payment drops, and when that cost is recovered. |
Common questions
How much do extra payments actually save?
An extra payment applied to principal removes both that amount from the balance and all the future interest that balance would have generated, which is why the saving is larger than the payment. The effect is biggest early in the term, when the balance — and so the interest on it — is at its highest.
What is the difference between a recast and a refinance?
A recast keeps the existing loan, rate, and end date, and recalculates the payment down after a lump sum against principal. A refinance replaces the loan entirely, which means new terms, a new rate, and new closing costs. The recast calculator models the first; the refinance tools model the second.
Does paying biweekly really shorten the loan?
Paying half the monthly amount every two weeks produces 26 half-payments a year, which is 13 monthly payments rather than 12. The shortening comes from that one extra payment per year going against principal, not from the fortnightly timing itself.
Are mortgage points worth paying?
Points are interest paid upfront to lower the rate, so the question is arithmetic: how long it takes for the reduced monthly payment to recover the upfront cost. That break-even depends on how long the loan is actually held, which is why the calculator asks for the figures rather than giving a rule.
Other decisions
What do I actually take home?
Estimate take-home pay, salary deductions, tax withholding, and employer payroll cost.
Can I buy this home?
Estimate home affordability, mortgage payments, down payment, loan-to-value, and closing costs.
Should I refinance or use home equity?
Compare refinance options, break-even timing, equity access, HELOCs, and cash-out choices.
What will this loan cost me?
Estimate payment, APR, repayment schedule, and total loan cost.
How do I get out of debt?
Plan payoff, minimum payments, balance transfers, consolidation, and debt ratios.
How will my money grow?
Saving, Investing & Retirement
Project compounding, investment growth, and retirement savings.