Fixed vs Adjustable-Rate Mortgage: Which Is Better?
By Colson · Reviewed by Abodemic Editorial Standards · Updated June 1, 2026
A fixed-rate mortgage keeps the same payment for the whole term; an ARM starts lower for an intro period (e.g. 5 years) then adjusts with the market. Fixed wins for certainty and long stays; an ARM can win if you'll move or refinance before it adjusts.
Fixed vs adjustable: what's the difference?
A fixed-rate mortgage locks the same interest rate — and the same principal-and-interest payment — for the entire term. An adjustable-rate mortgage (ARM) offers a lower fixed rate for an intro period (often 5, 7, or 10 years), then adjusts periodically with a market index. Try an ARM scenario in the ARM calculator.
When does an ARM make sense?
An ARM can save money if you're confident you'll sell or refinance before the fixed period ends, or if intro rates are meaningfully below fixed rates. The risk is being stuck when the rate adjusts upward — always model your payment after the adjustment.
When is fixed better?
Choose fixed if you value certainty, plan to stay long-term, or can't absorb a higher payment later. Most buyers prefer the predictability of a fixed rate; compare both in the mortgage calculator.