Mortgage Calculators

APR Calculator for Adjustable Rate Mortgages

For an ARM, the APR reflects the initial rate plus your upfront fees. Use it to compare ARM offers on a consistent basis.

Inputs

Loan amount

Initial rate

Loan term (years)

Discount points

Other closing fees

Estimates only. Change any value to recalculate instantly.

Initial-rate APR 5.672% versus a 5.50% initial rate

Initial rate 5.50%

APR (initial) 5.672%

Points cost $3,200

Total fees $6,000

Upfront cost

Points $3.2k
Other fees $2.8k

Loan balance Balance (initial rate)

For an ARM, the standard APR is based on the initial rate plus fees, so it understates the cost if the loan later adjusts upward. Treat it as a starting comparison and check the rate caps and fully-indexed rate too.

Amortization at the initial rateView table

Year	Principal	Interest	Balance
1	$4,311	$17,492	$315,689
2	$4,554	$17,249	$311,135
3	$4,811	$16,992	$306,325
4	$5,082	$16,721	$301,243
5	$5,369	$16,434	$295,874
6	$5,672	$16,132	$290,202
7	$5,992	$15,812	$284,211
8	$6,329	$15,474	$277,881
9	$6,687	$15,117	$271,195
10	$7,064	$14,739	$264,131
11	$7,462	$14,341	$256,669
12	$7,883	$13,920	$248,786
13	$8,328	$13,475	$240,458
14	$8,797	$13,006	$231,661
15	$9,294	$12,509	$222,367
16	$9,818	$11,985	$212,549
17	$10,372	$11,431	$202,177
18	$10,957	$10,846	$191,221
19	$11,575	$10,228	$179,646
20	$12,228	$9,575	$167,418
21	$12,918	$8,886	$154,500
22	$13,646	$8,157	$140,854
23	$14,416	$7,387	$126,438
24	$15,229	$6,574	$111,209
25	$16,088	$5,715	$95,121
26	$16,996	$4,807	$78,126
27	$17,954	$3,849	$60,171
28	$18,967	$2,836	$41,204
29	$20,037	$1,766	$21,167
30	$21,167	$636	$0

How this calculator works

This calculator runs entirely in your browser — nothing you enter is sent anywhere, and there is no sign-up. Change any input and the result, breakdown, and schedule update instantly.

Rate and cost fields are pre-filled with current benchmarks (Federal Reserve / Freddie Mac via FRED (St. Louis Fed)), so your first result is already realistic — replace them with your own quote to see your numbers. To weigh one option against another, use the loan comparison calculator.

30-year fixed mortgage rate, 2019–2026

Source: Freddie Mac PMMS via FRED. Annual averages; latest weekly reading shown.

Common questions

Is this calculator free, and do I need to sign up?

Yes and no — it is completely free and asks for no account or personal details. Every calculation happens in your browser, so nothing you type is stored or sent to us.

How accurate are the results?

The math is exact for the inputs you give it, but the defaults are national benchmarks — your real rate, fees, taxes, and insurance will differ. Treat the result as a close estimate to refine with a real quote.