HR Calculators
Employee turnover, PTO, severance pay & productivity calculators.
What Are HR Calculators?
HR calculators help human resources professionals, business owners, and managers quantify the key workforce metrics that drive people strategy — from total employee cost and compensation benchmarking, to turnover rate analysis, PTO accrual, and payroll estimations. Data-driven HR decisions lead to better budgeting, fairer pay structures, and lower attrition costs.
Employee cost calculators reveal the true cost of employment beyond the headline salary. Employer payroll taxes, pension or retirement contributions, health insurance premiums, paid leave, recruitment costs, and equipment all add to the total. In the UK, employer National Insurance contributions add approximately 13.8% above the gross salary for most employees. In the US, employer FICA taxes add 7.65% of wages up to the Social Security wage base. The fully-loaded cost of an employee is typically 1.25–1.4 times their gross salary.
Employee turnover is one of the most costly and least tracked HR metrics in small and mid-sized businesses. The Society for Human Resource Management (SHRM) estimates that replacing an employee costs between half and twice their annual salary, accounting for recruitment fees, lost productivity during the vacancy, onboarding time, and the learning curve for the new hire. Our turnover cost calculator makes this concrete with your actual salary and vacancy duration data.
PTO and leave calculations determine how much paid time off employees accrue based on hours worked, years of service, and company policy. Accrual methods vary: some companies give a lump sum at the start of the year; others accrue a fraction of annual entitlement per pay period or per hour worked. Accurate PTO tracking is important for both employee fairness and financial reporting — accrued leave is a real liability on the balance sheet.
Payroll and salary calculations estimate gross-to-net pay across different pay frequencies (hourly, weekly, bi-weekly, monthly), convert between salary and hourly rates, and compute overtime pay at the applicable multiplier (typically 1.5× for hours over 40 per week in the US, or above contracted hours in the UK). These tools support offer letter preparation, budget planning, and employee pay queries.
All HR Calculators (7)
Employee Turnover Calculator
Calculate employee turnover rate and cost of turnover for your organization.
PTO Calculator
Calculate PTO balance, accrual, and payout value for employees.
Vacation Accrual Calculator
Calculate vacation days accrued per pay period, month, and year.
Notice Period Calculator
Calculate the notice period required and last working day based on resignation date.
Severance Pay Calculator
Calculate severance pay based on years of service, salary, and company policy.
Attrition Rate Calculator
Calculate employee attrition rate by month, quarter, and year.
Employee Productivity Calculator
Calculate employee productivity, revenue per employee, and output per labor hour.
HR Calculator Guides
Employee Cost & Compensation
Total Employee Cost = Gross Salary + Employer NI/FICA + Pension Contributions + Benefits + Recruitment Cost ÷ Average Tenure. In the UK: Employer NI = 13.8% of earnings above the secondary threshold (£9,100/year, 2024/25). In the US: Employer FICA = 6.2% Social Security (up to $168,600 wage base) + 1.45% Medicare = 7.65% total. Benefits (health insurance, dental, life insurance) typically add another 10–20% of salary in the US.
Salary benchmarking compares an employee\'s total compensation against market data for the same role, level, and geography. Compa-ratio = Employee Salary ÷ Market Midpoint × 100. A compa-ratio of 100% means the employee is paid exactly at market midpoint; below 85% suggests the role is underpaid relative to the market, increasing flight risk; above 115% suggests overpayment relative to market.
Turnover & Retention
Turnover Rate = (Separations in Period ÷ Average Headcount) × 100. Voluntary turnover is the more strategically important component — employees who choose to leave. The cost per departure: Replacement Cost = (Recruitment Fees or Time) + (Lost Productivity during Vacancy) + (Onboarding Time × New Hire Salary) + (Learning Curve Productivity Loss). A conservative estimate is 50% of annual salary for non-managerial roles; 100–200% for senior or specialist positions.
Retention strategies are most cost-effective when targeted at high-turnover segments. Calculate turnover separately by department, tenure band, and performance rating to identify where attrition is concentrated. New hire turnover (first 12 months) is especially costly because onboarding investment is lost — tracking 90-day and 12-month survival rates provides an early warning of onboarding effectiveness.
PTO, Payroll & Leave
PTO accrual per pay period: Accrual Rate = Annual Entitlement (hours) ÷ Pay Periods per Year. For an employee with 15 days (120 hours) annual leave on a bi-weekly payroll (26 periods): accrual = 120 ÷ 26 = 4.62 hours per pay period. Hourly accrual for variable-hours workers: Accrual = Hours Worked × (Annual Entitlement ÷ Standard Annual Hours). Accrued but untaken leave is a balance sheet liability — valued at the employee\'s current hourly rate.
Salary to hourly conversion: Hourly Rate = Annual Salary ÷ (Hours per Week × Weeks per Year). For a £40,000 salary working 37.5 hours/week: £40,000 ÷ (37.5 × 52) = £20.51/hour. Overtime rate (1.5×): £30.77/hour. This conversion is useful for calculating the cost of overtime, the value of a pay rise per hour worked, and comparing salaried vs hourly employment offers.
Top HR Calculators
Employee Cost Calculator
Calculate the true total cost of an employee including salary, taxes, benefits, and recruitment.
Employee Turnover Calculator
Calculate turnover rate and the financial cost of replacing departing employees.
Salary Calculator
Convert between annual salary, monthly pay, and hourly rate at any hours-per-week figure.
PTO Calculator
Calculate PTO accrual per pay period and remaining balance for any leave policy.
Severance Pay Calculator
Estimate statutory and contractual severance pay based on years of service and weekly pay.
Key Formulas & References
Turnover Rate
(Separations ÷ Average Headcount) × 100
Calculate separately for voluntary, involuntary, and total turnover
PTO Accrual/Period
Annual PTO Hours ÷ Pay Periods per Year
E.g. 120 hours ÷ 26 bi-weekly periods = 4.62 hours per period
Salary to Hourly
Hourly = Annual Salary ÷ (Hours/Week × 52)
Standard year = 2,080 hours (40h/week); 37.5h week = 1,950 hours
Compa-Ratio
(Employee Salary ÷ Market Midpoint) × 100
Target range 85–115%; below 85% = underpaid vs market
Frequently Asked Questions About HR Calculators
True employee cost = Gross Salary + Employer payroll taxes (NI/FICA) + Pension contributions + Benefits (health, dental, life insurance) + Annual recruitment cost amortised over average tenure + Training and equipment. In the UK, add approximately 20–25% to gross salary for employer NI and pension auto-enrolment minimum. In the US, add approximately 20–30% depending on benefit provision.
Turnover Rate = (Number of Separations during Period ÷ Average Number of Employees during Period) × 100. For monthly rate: use separations and headcount for that month. For annual rate: use full-year separations and average monthly headcount. Calculate voluntary and involuntary turnover separately — voluntary turnover is the indicator of workforce engagement and compensation competitiveness.
SHRM estimates replacement cost at 50–200% of annual salary depending on role seniority and specialisation. Components include: external recruitment fees (15–25% of salary for agency hires), internal recruiter time, interview time from hiring managers, reduced productivity during the vacancy, onboarding programme costs, and the productivity ramp for the new hire (typically 3–12 months to full productivity).
PTO accrual per pay period = Annual PTO Hours ÷ Number of Pay Periods per Year. For hourly workers, multiply hours worked by the accrual rate per hour: Annual Hours ÷ Standard Annual Work Hours. Accrued but untaken PTO is a financial liability — most jurisdictions require it to be paid out on termination, so tracking it accurately is both a legal and accounting requirement.
Hourly Rate = Annual Salary ÷ (Hours per Week × Weeks per Year). For a standard 40-hour, 52-week year: divide by 2,080. For a 37.5-hour week: divide by 1,950. This conversion is useful for calculating overtime costs, the incremental value of a pay rise, and comparing full-time and part-time employment offers on a consistent basis.
Compa-ratio = (Employee's Salary ÷ Market Midpoint for the Role) × 100. A compa-ratio of 100% means the employee is paid at the market midpoint. Most HR policies target a range of 85–115%. Employees below 85% are at elevated flight risk; employees above 115% may indicate pay compression issues elsewhere in the grade.
BrainyCalculators Editorial Team
Our HR calculators are researched, built, and reviewed by the BrainyCalculators editorial team using industry-standard formulas and validated against authoritative references. Results are updated whenever underlying standards, rates, or guidelines change. All calculators are free, require no account, and run entirely in your browser.