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Dates & time

Time Card Calculator

Total shifts and break deductions from one row per shift, then apply a flat hourly rate. Use clock times rather than decimal-hour numbers in the shift rows.

  • Explicit formulas and worked examples
  • Check your inputs, then calculate
  • Data is calculated in this browser only

Check the stated input format, calculation convention and limits before using the result.

Your inputs

Local calculation

Check the example inputs, then calculate. Your values stay in this browser.

Up to 366 shifts; each shift must have exactly three columns.

Calculation notes

Understand the Time Card Calculator

Time Card Calculator validates rows: start hh:mm, end hh:mm, break minutes, hourly rate, allow overnight shifts before applying the displayed equation. Up to 366 shifts; each shift must have exactly three columns.

Formula and logic

What is the formula for the Time Card Calculator?

Time Card Calculator: total hours = Σ(shift minutes − breaks) / 60; pay = hours × hourly rate. Input definitions: rows = Rows: start HH:MM, end HH:MM, break minutes; rate = Hourly rate; overnight = Allow overnight shifts. Use the selected convention throughout the calculation.

Worked example

How can I reproduce the Time Card Calculator example?

Time Card Calculator baseline input: Rows: start HH:MM, end HH:MM, break minutes: 09:00 17:30 30 / 09:00 17:00 30; Hourly rate: 20; Allow overnight shifts: not selected. Output: Total hours = 15.5 hours; Gross pay (no overtime rule) = 310. Substitute these values into the displayed equation to reproduce the result.

How to read the result

How should I interpret the Time Card Calculator result?

  • Read total hours with its stated unit and convention. The default example and the independent worked scenario use different inputs, so compare the assumptions before comparing the numbers.
  • Change one input at a time and use the equation to explain the result; do not mix unit, grade-scale, time-zone or rounding conventions across comparisons.
Limits and assumptions

What limits apply to the Time Card Calculator?

  • Up to 366 shifts; each shift must have exactly three columns.
  • Overtime, taxes, jurisdictional break rules and daylight-saving transitions are not modeled.

Content and calculation reviewed:

Understand the calculation

How to use it and the math behind it

Read the complete explanation

Four steps to check your inputs and results

  1. Total shifts and break deductions from one row per shift, then apply a flat hourly rate. Use clock times rather than decimal-hour numbers in the shift rows.
  2. Enter Rows: start HH:MM, end HH:MM, break minutes, Hourly rate, Allow overnight shifts in the stated format. Baseline values are for reproduction.
  3. Check the output unit and convention: Read total hours with its stated unit and convention. The default example and the independent worked scenario use different inputs, so compare the assumptions before comparing the numbers.
  4. Change one input and compare the result. Up to 366 shifts; each shift must have exactly three columns. Overtime, taxes, jurisdictional break rules and daylight-saving transitions are not modeled.

Time Card Calculator: calendar conventions

Add shift minutes before converting the total to hours. Shifts 09:00–12:00 with no break and 13:00–17:00 with a 30-minute break contribute 180+210=390 minutes, or 6.5 hours. At a flat rate of 12, gross pay is 78. This avoids rounding each shift separately; payroll-specific overtime, deductions and rounding still need a separate policy.

total hours = Σ(shift minutes − breaks) / 60; pay = hours × hourly rate

The detailed guide adds variable definitions, a reproducible example, a practice question and model limitations.

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