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ARM Calculator โ€” Adjustable-Rate Mortgage Analysis

Calculate ARM payments, worst-case scenarios, and payment shock. Compare initial rate vs capped maximum.

Concept Fundamentals
$2,398
Initial Payment
$3,648
Worst Case
11.0%
Max Rate
$838,338
Interest (Worst)
Calculate ARM

Why This Matters for Your Finances

Why: ARMs offer lower initial rates but carry rate risk. Caps limit how much your payment can increase.

How: Initial payment uses fixed rate. After fixed period, rate = index + margin, subject to periodic and lifetime caps.

  • โ—5/1 ARM = 5 yr fixed, then annual
  • โ—Caps protect from runaway rates
  • โ—Compare break-even vs fixed
  • โ—Plan for payment shock
Sources:Freddie MacCFPB

ARM Calculator

Adjustable-rate mortgage โ€ข Payment scenarios โ€ข Rate caps

ARM Types

ARM Details

Principal
$
Start rate
%
5/1, 7/1, etc.
years
Per adjustment
%
Max increase
%
Above index
%
arm_calc.sh
CALCULATED
$ analyze --type=arm
Initial Payment
$2,398
After First Adjust
$2,933
Worst Case
$3,648
Max Increase
+$1,250
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ARM Calculator
Initial Payment
$2,398
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Payment Scenarios

Rate Structure

Payment Over Time

Worst Case Increase

Calculation Breakdown

ARM Structure

Loan Amount$400,000
Initial Rate6%
Fixed Period5 years
Periodic Cap2%
Lifetime Cap5%

Rate Scenarios

Initial Rate6%
After First Adjustment8%
Maximum Rate (Lifetime)11%

Payment Scenarios

Initial Payment$2,398
After First Adjust$2,873
Worst Case$3,648
Max Payment Increase+$1,250

Balance at Adjustment

Balance After Fixed Period$372,217

Get AI-Powered Analysis

Get personalized ARM analysis.

1. Key Takeaways

  • โ€ข Always plan for worst-case payment
  • โ€ข Caps protect you from extreme rate swings
  • โ€ข Best for short-term ownership
  • โ€ข Have an exit strategy before adjustment
  • โ€ข Monitor rates and refinance options

2. Understanding ARM Structure

Cap Types

  • โ€ข Initial cap: First adjustment limit
  • โ€ข Periodic cap: Each adjustment limit
  • โ€ข Lifetime cap: Total max increase

Common ARMs

  • โ€ข 5/1 ARM: Fixed 5 years, annual adjust
  • โ€ข 7/1 ARM: Fixed 7 years, annual adjust
  • โ€ข 10/1 ARM: Fixed 10 years, annual adjust

3. How It Works

Rate = Index + Margin. Adjusts at fixed period end. Capped by periodic and lifetime caps.

4. Expert Tips

Plan exit

Refinance or sell before adjustment

Budget worst-case

Can you afford max payment?

Compare caps

Lower caps = more protection

Short-term

Best if moving in 5โ€“7 years

5. ARM Types Reference

TypeFixed PeriodAdjustment
5/1 ARM5 yearsAnnual
7/1 ARM7 yearsAnnual
10/1 ARM10 yearsAnnual

6. FAQ

What is ARM? Adjustable-rate mortgage; rate changes after fixed period.
What is periodic cap? Max rate increase per adjustment (e.g., 2%).
What is lifetime cap? Max total rate increase over loan life.
When to choose ARM? Short-term ownership, expect to move or refinance.

7. Quick Stats

5โ€“10

yr typical fixed

2%

typical periodic cap

5%

typical lifetime cap

SOFR

common index

8. Sources

Freddie Mac, Fannie Mae ARM guidelines; CFPB mortgage resources.

9. Disclaimer

This calculator provides estimates. Actual ARM terms, caps, and rates vary by lender.

โš ๏ธFor educational and informational purposes only. Verify with a qualified professional.

๐Ÿ’ก Money Facts

5/1

5 yr fixed

โ€” Common

2%

Typical periodic cap

โ€” Per adjust

5%

Typical lifetime cap

โ€” Max increase

Margin

Index + margin

โ€” Rate formula

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