Adjustable-Rate Mortgage Calculator
10/1 ARM Calculator
Estimate your 10/1 ARM payment during the first ten years, then model annual rate resets using index + margin and the cap structure from your loan offer. See the projected first adjusted payment, longer-term payment path, and a cap-based stress test.
Last reviewed: September 1, 2026
10/1 ARM Mortgage Calculator
Estimate the first 10 years, annual resets after month 120, and a cap-based payment stress test.
10/1 ARM Loan Details
Your 10/1 ARM Results
Includes principal and interest at the initial ARM rate plus entered property taxes, homeowners insurance, HOA fees, and estimated PMI when applicable.
Under the projected rate path, estimated interest through year 10 is $207,449, with about $302,862 remaining on the loan. The modeled P&I payment at that horizon is about $2,205 per month.
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| Month | Target Rate | Capped Rate | New P&I | Balance |
|---|---|---|---|---|
| 121 | 7.750% | 7.750% | $2,486 | $302,332 |
| 133 | 8.000% | 8.000% | $2,532 | $295,710 |
| 145 | 8.250% | 8.250% | $2,576 | $288,752 |
| 157 | 8.500% | 8.500% | $2,618 | $281,410 |
| 169 | 8.750% | 8.750% | $2,659 | $273,630 |
| 181 | 9.000% | 9.000% | $2,699 | $265,352 |
| 193 | 9.250% | 9.250% | $2,736 | $256,508 |
| 205 | 9.500% | 9.500% | $2,772 | $247,020 |
| 217 | 9.750% | 9.750% | $2,806 | $236,798 |
| 229 | 10.000% | 10.000% | $2,838 | $225,741 |
| 241 | 10.250% | 10.250% | $2,868 | $213,731 |
| 253 | 10.500% | 10.500% | $2,895 | $200,633 |
| 265 | 10.750% | 10.750% | $2,921 | $186,290 |
| 277 | 11.000% | 11.000% | $2,943 | $170,520 |
| 289 | 11.250% | 11.200% | $2,959 | $153,109 |
| 301 | 11.500% | 11.200% | $2,959 | $133,776 |
| 313 | 11.750% | 11.200% | $2,959 | $112,164 |
| 325 | 12.000% | 11.200% | $2,959 | $88,003 |
| 337 | 12.250% | 11.200% | $2,959 | $60,993 |
| 349 | 12.500% | 11.200% | $2,959 | $30,798 |
Important 10/1 ARM Assumptions
This calculator assumes a five-year initial fixed period and annual adjustments afterward. It models future rates from the index, margin, index-change assumption, and caps you enter. It does not forecast an ARM index. Actual loan documents may include floors, rounding rules, different cap definitions, and other provisions that change the result.
Compare 10/1 ARM Rates
Compare Current 10/1 ARM Mortgage Offers
Review available 10-year ARM offers from participating lenders after modeling the ten-year fixed period and possible later adjustments.
What is a 10/1 ARM?
A 10/1 ARM is an adjustable-rate mortgage that generally keeps its initial interest rate for the first ten years and then adjusts once per year. The starting principal-and-interest payment is therefore predictable for the first 120 months, while later payments depend on the mortgage's index, lender margin, adjustment caps, and other contract provisions.
Because the initial fixed period lasts a full decade, a 10/1 ARM provides substantially more rate stability than shorter 3/1, 5/1, or 7/1 structures before its first scheduled adjustment.
How a 10/1 ARM payment changes after year 10
At a scheduled adjustment, many ARMs determine a target rate from a benchmark index plus the lender's margin. The mortgage's caps can then limit how far the actual rate moves at that reset.
Target rate = index + margin
The calculator applies your first-adjustment, later periodic, and lifetime caps before recalculating principal and interest over the remaining balance and term.
What happens at the first 10/1 ARM reset?
A typical 10/1 ARM reaches its first adjustment after the initial 120-month fixed period. If the fully indexed rate is above or below the introductory rate, the mortgage rate may change subject to the contract's first-adjustment cap, any floor, and other provisions.
The principal-and-interest payment is then recalculated using the remaining mortgage balance and remaining amortization term. The calculator emphasizes this first reset because it is the first point at which the rate can change after a full decade of fixed pricing.
Understanding 10/1 ARM rate caps
First adjustment cap
Limits how much the rate can move when the ten-year introductory period ends.
Periodic cap
Limits how much the rate can change at each later annual adjustment.
Lifetime cap
Limits how far the mortgage rate can rise above its initial rate over the life of the loan.
Do not assume every 10/1 ARM has the same cap structure. The index, margin, caps, floor, rounding rules, and adjustment dates should be taken from the actual lender disclosures.
Why the 10/1 ARM calculator includes a payment stress test
The projected scenario follows the index-change assumption you enter. The separate cap-stress scenario instead assumes the ARM rate rises by the maximum permitted amount at the first reset and at later annual adjustments until the modeled lifetime ceiling is reached.
This stress test is not a mortgage-rate forecast. It is a planning tool for evaluating the payment risk you could face if you still have the loan after year ten and rates move against you.
When a 10/1 ARM may be worth considering
A 10/1 ARM may be worth comparing when its introductory rate is meaningfully below comparable fixed-rate pricing and you value a long initial period without rate resets. Ten years can cover a substantial portion of many homeowners' expected holding periods while preserving the possibility of lower introductory pricing.
The tradeoff is that a borrower who still has the mortgage after the first decade becomes exposed to annual adjustments. A planned sale or refinance should therefore be treated as a possibility, not a guaranteed exit.
10/1 ARM vs. 7/1 ARM and fixed-rate mortgages
A 10/1 ARM delays the first adjustment three years longer than a 7/1 ARM and five years longer than a 5/1 ARM. That additional stability may come with different pricing, so the introductory rate should be compared with both shorter ARMs and fixed-rate mortgages rather than evaluated alone.
If your main question is adjustable versus fixed, use the ARM vs. Fixed Mortgage Calculator. For a configurable ARM model, use the ARM Mortgage Calculator.
Frequently asked questions
When does a 10/1 ARM first adjust?
A typical 10/1 ARM keeps its introductory rate for ten years and reaches its first adjustment after that initial fixed period. Verify the exact adjustment date in your loan documents.
How often does a 10/1 ARM adjust after year 10?
The /1 generally indicates that the interest rate can adjust once per year after the initial ten-year fixed period.
Can a 10/1 ARM rate decrease after the fixed period?
Potentially. If the applicable index is lower, the fully indexed rate may decline at an adjustment. Floors, caps, margin, and other contract provisions can affect the actual result.
What does a 2/1/5 cap structure mean?
A common interpretation is a 2-percentage-point limit at the first adjustment, a 1-point limit at later annual adjustments, and a lifetime maximum 5 points above the initial rate. Always verify the specific loan's definitions.
Can I refinance before the first 10/1 ARM reset?
Potentially, but refinancing is not guaranteed. Future mortgage rates, credit, income, equity, closing costs, and underwriting all affect whether refinancing is available or worthwhile.
What should I compare besides the introductory 10/1 ARM rate?
Review the index, lender margin, first and periodic caps, lifetime cap, any floor, points and fees, maximum-payment disclosures, and comparable fixed-rate options.
Methodology and related ARM calculators
MortgagePaymentCalculator.io is published by Family Brands LLC. Calculator results are estimates for educational and planning purposes and are not mortgage offers, approvals, rate forecasts, or lender disclosures.