Free HR calculators for pay, time off, cost, and workforce metrics
17 calculators for US HR and payroll teams, from overtime and time cards to turnover and the true cost of an employee. Each one shows the formula, a worked example, and the rules that change the answer.
- 17 calculators
- 4 categories
- 2026 federal tax figures
- 0 sign-ups needed
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Overtime calculator
Work out overtime pay under federal rules or the daily overtime rules in California, Alaska, and Colorado, including bonuses that change the regular rate.
Pay and hoursSalary to hourly calculator
Convert an annual salary to an hourly rate, or an hourly wage to a yearly salary, with weekly, biweekly, semimonthly, and monthly amounts.
Pay and hoursTime card calculator
Add up a week of clock-in and clock-out times, subtract unpaid breaks, handle overnight shifts, and estimate pay with weekly overtime.
Pay and hoursSalary increase calculator
Find a new salary from a raise percentage, or the percentage from a new salary, and see what the raise means per paycheck and per hour.
Pay and hoursProrated salary calculator
Calculate pay for a new hire, a departing employee, or an unpaid absence when someone works only part of a pay period or year.
Pay and hoursCompa-ratio calculator
See where an employee's pay sits in its salary range, with compa-ratio and range penetration, before you approve a raise or an offer.
Time offPTO accrual calculator
Turn an annual PTO allowance into an accrual rate per pay period, per month, and per hour worked, with an optional cap.
Time offPTO payout calculator
Estimate the payout for unused vacation or PTO at separation, with notes on states that require it.
Workforce metricsCost per hire calculator
Add up internal and external recruiting costs for a period and divide by hires, using the method in the SHRM and ANSI cost per hire standard.
Employer cost and complianceEmployee cost calculator
Estimate what an employee really costs once you add payroll taxes, health benefits, retirement, workers' compensation, and equipment.
Employer cost and complianceEmployer payroll tax calculator
Estimate the employer share of Social Security, Medicare, FUTA, and state unemployment tax for one employee or a whole team.
Employer cost and complianceFTE calculator
Convert full-time and part-time headcount into full-time equivalents, and estimate whether you are an applicable large employer under the ACA.
Workforce metricsEmployee turnover rate calculator
Calculate employee turnover for a month, quarter, or year, split by voluntary and involuntary departures, with an annualized rate.
Workforce metricsEmployee retention rate calculator
Measure how many employees you kept over a period, plus how many new hires stayed past their first 90 days.
Workforce metricsAbsenteeism rate calculator
Measure unplanned absence as a share of scheduled time and estimate what it costs in lost hours and pay.
Workforce metricseNPS calculator
Score the question 'How likely are you to recommend working here?' from promoter, passive, and detractor counts.
Workforce metricsHR to employee ratio calculator
See how many HR staff you have per 100 employees, and how many employees each HR person supports.
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How we build and check these calculators
Each calculator started with a question HR and payroll people ask us all the time: what do we owe this employee in overtime, what does this hire really cost, why does our turnover number never match finance's. We wrote the formula the way a payroll specialist would work it on paper, then built the tool around it.
Every formula is shown on its page, with a worked example you can check by hand. Federal figures, such as the 2026 Social Security wage base and FUTA rate, come from the Social Security Administration, the IRS, and the Department of Labor. Overtime rules follow the FLSA regulations and state labor departments. Metrics such as cost per hire follow published standards where they exist, including the ANSI and SHRM cost per hire standard.
No vendor paid for or reviewed any calculator. Read our editorial standards, meet the team, or see how we rate software in our methodology.
Getting reliable numbers
Most calculation mistakes in HR come from the inputs, not the math: the wrong workweek, a bonus left out of the regular rate, a different headcount in this report than the last. Decide how you count things, write it down, and apply it every time. The number then means something when you compare it month to month.
If you run these calculations every pay period, that's a sign the work belongs in a system. Payroll, time and attendance, and people analytics software do this math automatically and keep the history.
Frequently asked questions
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