Calculate extra shift earnings from either a flat amount per hour or a percentage differential.
Eight hours with a $2 hourly differential adds $16 to base pay.
The calculator keeps each component visible so you can review inputs instead of relying on one unexplained total.
Calculate extra shift earnings from either a flat amount per hour or a percentage differential. It can help employees, shift workers, freelancers, supervisors and small-business owners make quick planning estimates before reviewing an official time card or payroll statement.
Results can be formatted for USD, GBP, CAD, AUD, EUR or NZD when money is involved. Currency formatting does not apply tax, minimum-wage, overtime or employment-law rules automatically.
Enter the requested values and select Calculate. The tool applies this method: Differential pay = eligible hours × differential amount per hour.
The result is a planning estimate. Employer policies, contracts, taxes and employment laws can change the final amount.
No account is required. Calculator values are processed in your browser and are not saved to a payroll database by this site.