Free work calculators

Work Hours, Shift, PTO & Staffing Calculators

Choose a calculator, enter your figures and check the formula. No account required.

Payroll Calendars

Biweekly vs. Semimonthly Pay Calculator

Compare gross paycheck amounts when the same annual salary is paid 26 versus 24 times.

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Hours & Pay

Work Hours Calculator

Add clock-in and clock-out times, subtract breaks, and see regular and overtime hours.

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Shift Schedules

Rotating Shift Calendar

Generate a dated work/rest rotation and download an all-day calendar.

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Hours & Pay

Shift Differential Calculator

Estimate extra pay from night, evening, weekend or other premium hours.

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PTO

PTO Accrual Calculator

Calculate PTO earned per pay period and project an available balance.

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Payroll Calendars

Pay Date Calendar

Generate weekly, biweekly, semimonthly or monthly pay dates for a selected year.

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Workforce Planning

FTE & Headcount Calculator

Convert workload hours into productive and scheduled full-time equivalents.

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Hours & Pay

Business Days & Work Hours Calculator

Count working dates with custom weekdays and closures, then export a daily breakdown.

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Hours & Pay

Decimal Hours Calculator & Bulk Timesheet Converter

Convert a list of hours:minutes or decimal hours, add the total and download the results.

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PTO

PTO Balance Ledger with Accrual Cap

Apply dated earning and leave transactions in order to see balances and accrual blocked by a cap.

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Workforce Planning

Shift Coverage & Gap Calculator

Compare shift rows against a constant staffing target and see exactly when coverage falls short.

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Explore by topic

Start with the fundamentals

Browse all guides

Find the calculation that fits your task

Intious helps employees check a timecard, shift workers plan recurring workdays, and managers explore staffing capacity. Start with the relevant calculator above. Each tool shows its inputs, formula and limitations so you can understand the number before using it.

From a quick answer to a checkable result

A basic formula is only part of a work calculation. Midnight changes a timecard, a cycle anchor changes a shift calendar, and the order of PTO postings can change a capped balance. Our guides explain those differences with concrete examples and link directly to the tools that use them.

Use overnight shift calculations for clock entries across midnight, PTO caps and carryover for balance limitations, or FTE versus headcount when a capacity number is being mistaken for a hiring plan.

Frequently asked questions

Are the calculators free?

Yes. The published tools work without an account or payment. Enter your figures directly in the calculator; no subscription is required.

Are my hours and pay details uploaded?

The current calculator code processes entries on your device. Do not put private employee information into site search or contact messages. Hosting still involves ordinary technical page requests, as explained in the privacy policy.

Can I use these calculations at work?

Yes, for a planning estimate or arithmetic cross-check. Check your employer’s records, policies and the relevant rules before making payroll or staffing decisions. A calculator does not establish legal entitlement.

Where can I check how a result was produced?

Each tool has a formula, a worked example and related guides. The methodology page describes shared limitations, including daylight-saving changes, holiday adjustments and simplified PTO caps.

Timesheet Rounding Checker and Bulk Time Converter

Paste up to 500 durations, convert H:MM or decimal hours, and compare rounding each row with rounding the total once.

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Staffing Shrinkage and Productive Capacity Calculator

Estimate productive hours, the scheduled hours needed to cover demand, and the additional FTE required after unavailable time.

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Other languages and regional planning

Français — calculateurs et calendriers · Español — calculadoras de trabajo