Back Pay and Lost Wages Calculator
Estimate the total back pay and lost wages you may be owed due to wrongful termination, unpaid wages, discrimination, or other employment disputes. This calculator accounts for base wages, benefits, raises, and mitigation earnings.
Formulas Used
Lost Wages (with raises):
For each year n (0-indexed) in the loss period:
Lost Wages = Σ [ BaseAnnualWage × (1 + r)n × (days in year n / 365.25) ]
where r = annual raise rate (decimal).
Lost Benefits:
Lost Benefits = Monthly Benefits Value × (Total Days / 30.4375)
Gross Back Pay:
Gross Back Pay = Lost Wages + Lost Benefits + Additional Unpaid Wages
Net Back Pay:
Net Back Pay = max(0, Gross Back Pay − Total Mitigation Earnings)
where Total Mitigation = Monthly Mitigation × (Total Days / 30.4375)
Pre-Judgment Interest (simple):
Interest = Net Back Pay × (Annual Rate / 100) × (Total Days / 365.25)
Total Estimated Award:
Total Award = Net Back Pay + Pre-Judgment Interest
Assumptions & References
- Back pay is calculated from the date of termination (or start of the wage loss) through the selected end date, which may be the date of reinstatement, settlement, or judgment.
- A month is approximated as 30.4375 days (365.25 / 12) and a year as 365.25 days to account for leap years.
- Annual raises are applied on a compounding basis at each anniversary of the loss start date.
- Lost benefits should include the employer's share of health insurance premiums, 401(k) or pension contributions, paid time off, and other fringe benefits (see EEOC Enforcement Guidance on Remedies, 29 C.F.R. § 1614.501).
- Claimants have a legal duty to mitigate damages by seeking comparable employment. Mitigation earnings are subtracted from gross back pay (Ford Motor Co. v. EEOC, 458 U.S. 219 (1982)).
- Pre-judgment interest rates vary by jurisdiction. Federal courts often use the IRS underpayment rate or the 52-week Treasury bill rate (28 U.S.C. § 1961). State courts may set their own rates.
- This calculator does not account for front pay, compensatory damages, punitive damages, liquidated damages under the FLSA, or attorney's fees, all of which may also be recoverable.
- Applicable statutes include Title VII of the Civil Rights Act (42 U.S.C. § 2000e-5(g)), the Fair Labor Standards Act (29 U.S.C. § 216(b)), the Age Discrimination in Employment Act (29 U.S.C. § 626(b)), and state equivalents.
- Results are estimates only. Consult a licensed employment attorney for legal advice specific to your situation.