Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Payroll & Shift Work
How to Calculate 12-hour Shift Pay
Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).
Twelve-hour shifts change your effective rate when differentials apply. Model a full tour before you pick nights.
Inputs
10100
050
020
816
Smart analysis
Recommendations
Tailored to your live inputs and result—guidance only, not professional advice.
- Interpret
Treat this as a planning estimate
Primary result: Shift Pay = $369.60. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.
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Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Base Hourly Rate
The “Base Hourly Rate ($)” value used in this tool’s formula. Adjust it to see results update live.
Differential (%)
The “Differential (%)” value used in this tool’s formula. Adjust it to see results update live.
Flat Add-On ($/hr)
The “Flat Add-On ($/hr)” value used in this tool’s formula. Adjust it to see results update live.
Shift Hours
The “Shift Hours” value used in this tool’s formula. Adjust it to see results update live.
- baseRate
Base Hourly Rate ($)
The “Base Hourly Rate ($)” field. Default 28; typical range 10–100.
How this calculator works
Twelve-hour shifts change your effective rate when differentials apply. Model a full tour before you pick nights. Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12). Example: $28/hr with 10% differential → $30.80/hr. A 12-hour shift pays $369.60 (before taxes).
Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).
Example: $28/hr with 10% differential → $30.80/hr. A 12-hour shift pays $369.60 (before taxes).
When to use this 12-Hour Shift Pay
Common use cases
- Estimate gross pay for a 12-hour shift with optional differential percent or flat add-on.
- Sanity-check with this case: $28/hr with 10% differential → $30.80/hr. A 12-hour shift pays $369.60 (before taxes).
- The relationship is: Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).
Localized examples
- Payroll & Shift Work: the example on this page uses the same formula as the widget.
What you get
- Fields: Base Hourly Rate ($), Differential (%), Flat Add-On ($/hr), Shift Hours
- Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).
- Example on the page: $28/hr with 10% differential → $30.80/hr. A 12-hour shift pays $369.60 (before taxes).
How to Calculate 12-Hour Shift Pay Step-by-Step
- 1Enter base hourly rate.
- 2Set differential % and/or flat add-on.
- 3Confirm hours (default 12).
- 4Read premium rate and total shift pay.
Governing formula
Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).
$28/hr with 10% differential → $30.80/hr. A 12-hour shift pays $369.60 (before taxes).
Example: set Base Hourly Rate ($) = 28, Differential (%) = 10, Flat Add-On ($/hr) = 0, then read the result.
Variable definitions
- baseRate
Base Hourly Rate ($)
The “Base Hourly Rate ($)” field. Default 28; typical range 10–100.
- diffPercent
Differential (%)
The “Differential (%)” field. Default 10; typical range 0–50.
- flatAddOn
Flat Add-On ($/hr)
The “Flat Add-On ($/hr)” field. Default 0; typical range 0–20.
- hours
Shift Hours
The “Shift Hours” field. Default 12; typical range 8–16.
- The estimate (Premium rate = base × (1 + diff%/100) + flat; shift pay = premium × hours (default 12).) is for a meeting, not a signed forecast. Check the invoice or the contract.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Effective rate = base × (1 + differential%) + flat add-on. Multiply by hours for gross shift pay.
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See what others think about this tool, then leave your own rating to help improve CalculioHub.
4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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