COBRA Premium Calculator

COBRA lets you keep your former employer's group health coverage after a qualifying event, but you pay the full premium yourself. Federal law lets the plan charge up to 102 percent of the full cost (the combined employee and employer shares plus a 2 percent administrative fee), rising to 150 percent during a disability extension. This calculator combines the employee and employer shares, applies your administrative percentage, and shows your monthly COBRA premium plus annual and full-coverage-period totals.

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COBRA premium formula

Full plan cost = employee share + employer share
COBRA premium = full plan cost * (1 + admin fee / 100)
Annual COBRA cost = COBRA premium * 12
Total over period = COBRA premium * months of coverage

The full plan cost is the entire premium the plan charges. The administrative fee (up to 2 percent for standard coverage, up to 50 percent during a disability extension) is added on top.

COBRA context

  • COBRA generally applies to employers with 20 or more employees; smaller employers may face similar state continuation rules.
  • Standard continuation coverage lasts up to 18 months; some events extend it to 29 or 36 months.
  • The premium can be up to 102 percent of the full plan cost (100 percent plus a 2 percent admin fee).
  • During an 11-month disability extension, the cap rises to 150 percent of the full cost.
  • A Marketplace plan may be cheaper; compare before electing COBRA.

COBRA premium: frequently asked questions

How is a COBRA premium calculated?

Under federal COBRA rules, your premium can be up to 102 percent of the full cost of the plan, which is the employee share plus the employer share, plus a 2 percent administrative fee. During an 11-month disability extension, the premium can rise to 150 percent of the full cost. This calculator applies the administrative percentage you choose to the total plan cost.

Why is COBRA so much more expensive than my old premium?

While employed, your employer typically paid a large share of the premium. Under COBRA you pay the entire premium (both the former employee and employer shares) plus the administrative fee. That is why COBRA can feel dramatically more expensive than the payroll deduction you were used to.

How long does COBRA coverage last?

Standard COBRA continuation coverage lasts up to 18 months after a qualifying event such as job loss or reduced hours. Certain events, like disability or a second qualifying event, can extend coverage to 29 or 36 months. Enter the number of months you expect to keep coverage to see the total cost.

What counts as the full plan cost?

The full cost is the total premium the plan charges, combining the portion the employee paid through payroll and the portion the employer contributed. Your COBRA election notice or your former employer's benefits administrator can tell you the full monthly cost for your coverage tier.

Is the 2 percent administrative fee always charged?

Employers may charge up to a 2 percent administrative fee on standard COBRA coverage, but they are not required to charge the full amount. The 150 percent cap applies only during a disability extension. Enter the actual administrative percentage your plan uses, defaulting to 2 percent for standard coverage.

Official sources

Reviewed by the CalculatorHub team, edited by James Graham, 17 June 2026. See our methodology.