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HRCalcs
HR Compliance Calculators
Updated 2026

Unpaid Overtime Back Pay Calculator

Estimate unpaid FLSA overtime, liquidated damages under 29 U.S.C. §216(b), and how far back the claim reaches under §255(a). Because the remedy depends heavily on what was actually paid, the calculator asks that first.

Use this calculator when

  • A non-exempt employee worked more than 40 hours in a week
  • Overtime was underpaid or not paid at all
  • You want to size the exposure before talking to counsel or the DOL
  • Federal FLSA claim — state law may allow more
Wrong fit?To check what overtime should have been for a single week going forward, rather than what is owed for past weeks.FLSA Overtime Calculator

Calculator

Estimates unpaid overtime, liquidated damages and the statutory lookback for one employee.

What happened?

Estimated total exposure

$31,200.00

52 weeks × 10 OT hours/week at $20.00/hr regular rate

Unpaid per week
$300.00
Back wages
$15,600.00
Liquidated damages
$15,600.00
Lookback
2 years

Estimated exposure of $31,200.00 over 52 weeks: $15,600.00 in back wages plus $15,600.00 in liquidated damages, at a regular rate of $20.00/hr with 10 unpaid overtime hours per week.

Nothing was paid for the hours over 40, so the full time-and-a-half is outstanding for each of those hours.

Liquidated damages equal to the back wages are the default under 29 U.S.C. §216(b). A court may reduce or deny them if the employer proves it acted in good faith and had reasonable grounds to believe it was complying (29 U.S.C. §260).

A two-year lookback is assumed. If the violation is found willful — the employer knew of or showed reckless disregard for FLSA requirements — the period extends to three years, increasing the total by half.

This is an arithmetic estimate, not a legal opinion. A real claim depends on facts this calculator does not model: whether an exemption actually applied, how the regular rate is computed once bonuses and shift differentials are included, whether hours can be proven, state laws that run longer than the FLSA or allow larger damages, tolling, and settlement dynamics. It covers one employee under federal law only. Anyone relying on a number like this should speak with an employment attorney or the DOL Wage and Hour Division.

Formula

ot_hours_per_week = hours_worked − 40
weeks_counted = min(weeks_affected, willful ? 156 : 104)
nothing paid → unpaid/wk = rate × 1.5 × ot_hours
straight time paid → unpaid/wk = rate × 0.5 × ot_hours
misclassified → rate = salary ÷ hours_worked, then 0.5× or 1.5×
back_wages = unpaid_per_week × weeks_counted
liquidated = back_wages (29 U.S.C. §216(b))
total_exposure = back_wages + liquidated

The lookback cap matters more than people expect: at 2 years a claim covers 104 workweeks, at 3 years 156 — so a finding of willfulness increases the award by exactly 50% before liquidated damages are even applied.

Worked example

A warehouse worker earning $20/hr routinely works 50 hours a week. The employer pays for 40 hours and nothing for the rest.

  1. Overtime hours per week: 50 − 40 = 10
  2. Owed per overtime hour: $20 × 1.5 = $30.00
  3. Unpaid per week: $30.00 × 10 = $300.00
  4. Non-willful lookback: 2 years = 104 weeks
  5. Back wages: $300.00 × 104 = $31,200.00
  6. Liquidated damages: $31,200.00
  7. Total exposure: $62,400.00 — for one employee

If the same violation were found willful, the lookback becomes 156 weeks and the total rises to $93,600.00. Multiply across a shift or a job title and this is how wage-and-hour exposure reaches seven figures.

Frequently asked questions

How far back can unpaid overtime be claimed?

Under 29 U.S.C. §255(a) the FLSA statute of limitations is two years from the date each paycheck was due. It extends to three years if the violation was willful — meaning the employer knew its conduct was prohibited or showed reckless disregard for whether it was. Each underpaid workweek is treated as a separate violation, so the claim window rolls forward continuously.

What are liquidated damages?

Under 29 U.S.C. §216(b) an employer that violates the overtime provisions is liable for the unpaid wages plus an equal additional amount as liquidated damages — effectively doubling the award. They are the default, not a penalty a court has to be persuaded to add. Under 29 U.S.C. §260 a court may reduce or deny them if the employer proves it acted in good faith and had reasonable grounds to believe it was complying.

I was paid straight time for my overtime hours. Am I owed anything?

Yes, but less than if nothing had been paid. If you received your base rate for hours over 40, the straight-time component is already covered and only the additional half-time premium is outstanding — 0.5× the regular rate for each overtime hour. If you received nothing at all for those hours, the full 1.5× is owed.

I was salaried and classified as exempt. How is back pay calculated?

First the classification itself has to be wrong — a salary alone does not create an exemption; the duties test must also be met. If the classification was improper, courts are split on the remedy. Some divide the salary by all hours actually worked and award a 0.5× half-time premium, on the theory that the salary already compensated straight time for every hour (following Overnight Motor Transportation Co. v. Missel). Others award the full 1.5×. This calculator shows both figures as a range because which applies depends on your circuit and the facts.

Does my state let me claim more?

Often, yes. Several states have longer limitations periods than the FLSA — New York runs six years, California generally three or four depending on the theory — and some allow additional penalties such as waiting-time penalties for unpaid final wages. State claims are frequently worth more than the federal claim and are commonly pleaded alongside it. This calculator models federal law only.

Can my employer retaliate if I raise this?

Retaliation against an employee for filing a complaint, testifying, or otherwise asserting FLSA rights is prohibited by 29 U.S.C. §215(a)(3), and remedies can include reinstatement, lost wages and additional damages. Complaints can be filed with the DOL Wage and Hour Division, which does not charge for its services.

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