Skip to main content
Calcimator

COBRA Cost Calculator

Calculate your monthly COBRA premium and compare it to marketplace alternatives after losing employer coverage.

About this calculator

The COBRA Cost Calculator shows what continuing your employer health coverage actually costs once your employer stops subsidizing it, and compares that to a marketplace alternative over the number of months you'll need coverage. Under COBRA, you take over the full premium — both the share your employer used to pay and the share deducted from your paycheck — plus a 2% administrative fee, a charge the Department of Labor's EBSA caps at 102% of the plan's total premium cost, which is why COBRA Monthly Premium is almost always dramatically higher than Your Previous Monthly Share alone; the employer's contribution, not just your own, is what you lose. Monthly Increase and Premium Increase (%) quantify that jump directly against what you were used to paying as an employee.

Total COBRA Cost multiplies the monthly premium by Months of Coverage Needed (COBRA runs for up to 18 months under federal law for most qualifying events, such as job loss or reduced hours, longer in specific cases like disability or divorce), and the calculator compares that total against Marketplace Alternative Total — the same number of months at a comparable ACA marketplace plan's premium, entered before any subsidies. Difference (COBRA vs Market) and Better Option report which path costs less over the exact period you need coverage; marketplace premiums shown here are pre-subsidy figures, so if you'd qualify for a premium tax credit on the ACA marketplace, the real-world marketplace cost could be substantially lower than what's compared here. Family Members Covered is informational only — COBRA and marketplace premiums are both driven by the actual plan premium you enter, not recalculated per person by this calculator.

COBRA Monthly Premium

$714.00

Difference (COBRA vs Market)

$984.00

Inputs

$
$
months
$

Comparison

Total COBRA Cost

$4,284.00

Monthly Increase vs Employee Rate

$514.00

Premium Increase

257%

Marketplace Alternative Total

$3,300.00

Better Option

Marketplace

Whether COBRA or the marketplace alternative costs less over the coverage period entered.

Figures current as of 2026. Source: U.S. Department of Labor, Employee Benefits Security Administration (EBSA), COBRA Continuation Coverage

How to Use This Calculator
  1. Enter the portion of the monthly premium your employer was paying.
  2. Enter your previous monthly employee share of the premium.
  3. Enter the number of family members covered and the number of months of COBRA coverage you'll need (up to 18).
  4. Enter the monthly premium for a comparable ACA marketplace plan.
  5. Review your COBRA monthly premium (employer plus employee share, with a 2% admin fee built in), total COBRA cost, and how it compares to the marketplace total to see which option costs less.

How the result changes with Employer Premium Share

Employer Premium ShareCOBRA Monthly PremiumDifference (COBRA vs Market)
$250.00$459.00$546.00
$375.00$586.50$219.00
$750.00$969.00$2,514.00
$1,250.00$1,479.00$5,574.00

What each input means

Employer Premium Share
The portion of the monthly premium your employer was paying.
Your Previous Monthly Share
What you were paying per month for your share of the premium.
Family Members Covered
Number of people covered under COBRA.
Months of Coverage Needed
How many months you need COBRA before getting new coverage. Max is 18 months.
Marketplace Alternative Premium
Monthly premium for a comparable ACA marketplace plan (before subsidies).

What each result means

Better Option
Whether COBRA or the marketplace alternative costs less over the coverage period entered.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    5 parameters
    Employer Premium Share = 500, Your Previous Monthly Share = 200, Family Members Covered = 1, Months of Coverage Needed = 6, Marketplace Alternative Premium = 550 = 5 input(s) provided
  2. Calculate COBRA Monthly Premium
    COBRA Monthly Premium
    714 = $714
  3. Calculate Difference
    Difference = Math
    984 = $984
  4. Calculate Total COBRA Cost
    Total COBRA Cost
    4284 = $4,284
  5. Calculate Monthly Increase vs Employee Rate
    Monthly Increase vs Employee Rate
    514 = $514

Figures and sources

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why is my COBRA premium so much higher than what I paid as an employee?

As an employee, your employer was covering part of the premium — often the majority of it — and only deducting your share from your paycheck. COBRA requires you to pay the full premium yourself, employer's portion included, plus a 2% administrative fee, so the jump reflects the employer subsidy you're losing, not a price increase in the underlying plan itself.

How long can I stay on COBRA coverage?

Standard COBRA continuation coverage runs up to 18 months after a qualifying event like job loss, per the Department of Labor's EBSA COBRA rules, though certain circumstances (a second qualifying event, or a Social Security disability determination) can extend coverage to 29 or 36 months for some family members. This calculator caps Months of Coverage Needed at 18 to reflect the standard maximum.

Should I compare COBRA to the marketplace using the pre-subsidy premium?

The Marketplace Alternative Premium input is meant to be entered before any ACA premium tax credit, since that's the number most people find first when shopping. If your household income qualifies for a subsidy, your actual marketplace cost could be significantly lower than this comparison shows — check your eligibility on the marketplace directly, since it can change which option is genuinely cheaper.

Does Family Members Covered change the cost calculation?

No — this calculator uses the Employer Premium Share and Your Previous Monthly Share you enter directly as the basis for the COBRA premium, and those figures should already reflect whatever coverage tier (individual, employee-plus-one, family) you actually had. Family Members Covered is captured for your own reference but doesn't independently scale any of the cost outputs.

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

More in Insurance.