Examples
Examples
Try the starting example
- Shift starts on fixed-offset clock
- 2026-10-20T20:00
- Shift ends on same clock
- 2026-10-21T04:00
- Base hourly rate ($)
- 10
- Premium rules: name, daily start HH:MM, daily end HH:MM, extra $/hour
- Night,22:00,06:00,2 Late,00:00,02:00,3
- Overlapping premiums: additive or highest
- additive
- Base pay ($)
- $80.00
- Entered differential pay ($)
- $18.00
- Base plus differential ($)
- $98.00
- Hours covered by at least one premium
- 6
- Hours covered by multiple premiums
- 2
Try another scenario
- Shift starts on fixed-offset clock
- 2026-10-20T20:00
- Shift ends on same clock
- 2026-10-21T04:00
- Base hourly rate ($)
- 10
- Premium rules: name, daily start HH:MM, daily end HH:MM, extra $/hour
- Night,22:00,06:00,2 Late,00:00,02:00,3
- Overlapping premiums: additive or highest
- highest
- Base pay ($)
- $80.00
- Entered differential pay ($)
- $14.00
- Base plus differential ($)
- $94.00
- Hours covered by at least one premium
- 6
- Hours covered by multiple premiums
- 2
Calculation method
Calculation method
Base pay ($)
Elapsed whole minutes×base hourly rate/60, rounded to US cents.
Entered differential pay ($)
Evaluate daily premium windows minute by minute. Add active premiums or choose the highest, then round total premium-cent-minutes/60.
Base plus differential ($)
Base+differential.
Hours covered by at least one premium
Union of active premium minutes/60.
Hours covered by multiple premiums
Count minutes covered by two or more entered windows/60.
Symbols and units
- a
- Shift starts on fixed-offset clock
- b
- Shift ends on same clock
- c
- Base hourly rate ($)
- d
- Premium rules: name, daily start HH:MM, daily end HH:MM, extra $/hour
- e
- Overlapping premiums: additive or highest
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Repeating clock windows on one fixed-offset clock, with explicit stacking. No weekdays, daylight-saving changes, overtime interactions or statutory premium entitlement are inferred.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
US Department of Labor: pay/time recordkeeping background; actual rules vary ↗
Background reading; this does not imply endorsement or independent review of SumFizz.