What this tool calculates
This calculator compares two hourly-rate totals for the same number of hours. It reports the gross amount payable at the entered correct rate, the gross amount represented by the entered actual rate, and the non-negative difference between them. It is useful as a first reconciliation line when a payroll record used the wrong hourly rate.
The result is not a complete wage claim. It does not decide which rate legally applies, reconstruct workweeks, calculate overtime premiums, add statutory damages or interest, or subtract payroll tax and benefit deductions. Those questions depend on records and the rules for the relevant employment relationship.
Inputs
- Correct hourly rate is the gross straight-time rate that the user wants to test.
- Actual hourly rate is the gross straight-time rate that was used in the comparison payroll.
- Hours worked is the number of hours to which both rates apply.
All inputs must be finite and non-negative. Use one currency throughout. Separate periods when rates, overtime status, differentials, or currencies changed; adding unlike periods into one row hides information needed for review.
Method and formula
The tool computes three named amounts:
total payable = correct hourly rate × hours worked
total paid = actual hourly rate × hours worked
back pay owed = max(0, total payable − total paid)
The maximum operation prevents this underpayment worksheet from presenting a negative amount as “owed.” If the actual rate is higher, the reported back-pay amount is zero; the tool does not label the difference an overpayment or determine whether recovery is permitted.
This is straight multiplication. It does not apply time-and-one-half, double time, shift premiums, commissions, bonuses, minimum-wage adjustments, or deductions.
Worked example
Assume the correct hourly rate is 25, the payroll used 20, and the affected period contains 80 documented hours.
- Total payable: 25 × 80 = 2,000.
- Total represented as paid: 20 × 80 = 1,600.
- Gross rate difference: 2,000 − 1,600 = 400.
The calculator reports back pay owed of 400 in the entered currency. If the actual rate were 25 and the comparison rate 20, the arithmetic difference would be negative, but this page would report zero because it is scoped to potential underpayment.
How to interpret the result
Treat 400 as an initial gross comparison, not necessarily the amount of a paycheque or legal remedy. Reconcile it to time records, pay statements, rate notices, collective agreements, and the dates on which each rate was effective. Break the work into individual workweeks when overtime rules depend on weekly totals.
For payroll correction, identify whether the original payment already included premiums, allowances, paid leave, or other compensation. Keep the calculation inputs and source records together so the result can be independently reproduced.
Accuracy and limitations
Employment and wage rules differ by jurisdiction and worker classification. Local law may define compensable time, minimum pay, overtime, limitation periods, damages, recordkeeping, and permitted deductions differently. Taxes and deductions can make the net correction differ from this gross estimate.
The tool cannot determine employee status, the correct regular rate, exemptions, or legal entitlement. It also ignores interest, exchange rates, bonuses, commissions, tips, and benefits. Consult the applicable labor authority or appropriately qualified adviser for a disputed or material case. This page is not personalized legal, tax, or financial advice.
Sources
- U.S. Department of Labor, Back Pay explains back wages as a remedy in federal wage-law contexts and outlines recovery routes within that jurisdiction.
- U.S. Department of Labor, FLSA Handy Reference Guide summarizes federal minimum-wage, overtime, recordkeeping, and enforcement concepts that a simple rate-times-hours worksheet cannot resolve.
Editorial record
Author: SoupCalc Editorial Team
Last reviewed: August 14, 2026
Review scope: Non-negative validation, gross-rate formulas, overtime and deduction exclusions, jurisdiction warnings, official labor sources, and the 25/20/80 example were checked.