US employment is at-will, and there is no federal statutory severance — so instead of a severance formula, these pages honestly explain what you're legally owed when a job ends. That means your accrued PTO/vacation (which some states require to be paid out), your final paycheck (with state deadlines), and your rights under the WARN Act to advance notice of a mass layoff.
These are sourced reference pages, not calculators — because the honest answer in most cases depends on your state and your employer's written policy. Always confirm with your state labor department.