10/1 ARM Calculator
See the initial payment on a 10/1 adjustable-rate mortgage — fixed for 10 years, then adjusting annually — and the payment shock once it resets.
How the 10/1 arm calculator works
A 10/1 ARM fixes your rate for a full decade, then adjusts annually for the rest of the term. This tool amortizes the loan at the start rate across those ten years, then recomputes the payment at your estimated reset rate over the months that remain after the fixed period closes.
Ten years is the longest common fixed window, making the 10/1 the closest of these ARMs to a fixed-rate loan, with the smallest start-rate discount as a result. At each reset the rate becomes the index, typically SOFR, plus your fixed margin, held within the initial, periodic, and lifetime caps. The tool shows the opening payment, the payment after the first adjustment, and the balance still owed when the tenth year ends.
Worked example: with loan amount of $425,000, loan term (years) of 30 and initial fixed rate (10 yrs) of 6.50%, the 10/1 arm calculator shows initial monthly payment of $2,686.29.
- Payment (first 10 yrs)
- $2,686.29
- Payment after reset
- $2,902.54
- Balance at reset
- $360,299
- Rate change
- 6.50% → 7.50%
| Loan amount | Initial monthly payment |
|---|---|
| $300,000 | $1,896.20 |
| $425,000 | $2,686.29 |
| $550,000 | $3,476.37 |
| $700,000 | $4,424.48 |
The formula
The initial payment amortizes the whole balance at the start rate over the full term. After ten years the adjusted rate equals index + margin, bounded first by the initial cap and then by periodic and lifetime caps. The balance remaining at year ten re-amortizes at that capped rate over the months still outstanding.
- The rate is fixed for ten years and then adjusts every year, the structure that defines a 10/1 ARM.
- Caps are read as initial/periodic/lifetime, so a 5/2/5 set caps the first move at 5 points, later moves at 2, and the lifetime rise at 5.
- The estimated reset rate is your planning input; no model can predict where the index lands a decade out.
- The margin is fixed for the loan's life and added to whichever index value applies at each annual reset.
- Property taxes, insurance, HOA dues, and financed fees are not included in the payment figures shown here.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender or a licensed advisor.
Questions about the 10/1 arm calculator
Why is the 10/1 ARM's discount smaller than shorter ARMs offer?
The start-rate discount rewards the lender for the shorter time it is locked into a below-market rate. With ten fixed years, the 10/1 commits the lender almost as long as a fixed loan, so the savings versus a 30-year fixed are slim.
A 3/1 or 5/1 frees the lender to reprice far sooner, which is why those carry deeper discounts.
Who benefits most from a 10/1 ARM?
Borrowers with roughly a ten-year horizon who still want some discount over a fixed loan. If you reasonably expect to sell or refinance within a decade, you capture a long stretch of certainty at a rate slightly below a fixed mortgage, and the first reset may never arrive.
It suits those who want stability but stop short of a full 30-year commitment.
If a 10/1 is so close to a fixed loan, why not just take the fixed loan?
For many people the fixed loan is the simpler call, since the discount is modest and the certainty is permanent. The 10/1 wins only when the small start-rate savings matter and your horizon is firmly within ten years.
If there is any real chance you stay well beyond a decade, the fixed loan's guaranteed rate usually outweighs the 10/1's narrow early edge.
Is the 10/1 ARM Calculator free to use?
Yes. Every calculator on MortgageLoansCalculator is completely free, with no sign-up, login or paywall. Run as many scenarios as you like.
What is a 10/1 ARM?
A 10/1 ARM is fixed for ten years, then adjusts annually. It is the most conservative common ARM — a full decade of a fixed, usually lower-than-30-year rate before any adjustment risk begins.
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