📚 HR calculators
The HR calculators cluster covers workforce and recruiting math: employee turnover, voluntary and involuntary turnover, new-hire turnover, attrition, retention, cost per hire, time to fill, time to hire, application-to-interview and interview-to-offer rates, offer acceptance, internal fill rate, span of control, promotion rate, salary hike %, absenteeism, labor cost percentage, overtime rate, and training ROI—each on a single-intent URL.
Run people-ops math in one place: turnover (total, voluntary, involuntary, new-hire), retention, recruiting funnel yields, time to hire/fill, cost per hire, internal fill, span of control, promotions, salary hikes, absenteeism, labor cost %, overtime share, and training ROI. Match each tool to your HRIS definitions before reporting.
Key facts
| Primary audience | HRBPs, people analytics, talent acquisition, and ops leaders |
|---|---|
| Core formulas | Part÷whole×100 for rates; averages for time-to-hire/fill and cost-per-hire |
| Category | Human resources / people ops / recruiting |
| Related hubs | Professional KPIs; Business for margin/labor context |
Definitions
Turnover
Separations divided by average headcount × 100 for a defined period.
Time to hire
Average days from candidate apply/first touch to offer accept—distinct from time to fill.
Internal fill rate
Internal hires divided by total fills × 100.
Cost per hire
Total recruiting cost divided by number of hires.
Formulas
- Voluntary turnover %: (voluntary exits ÷ average headcount) × 100
- Interview-to-offer %: (offers ÷ interviews) × 100
- Time to hire: total candidate-days ÷ hires
- Span of control: employees ÷ managers
- Retention %: (remaining ÷ starting headcount) × 100
Comparison table
| Topic | Guidance |
|---|---|
| Voluntary vs involuntary | Voluntary is employee-initiated; involuntary is employer-initiated—together they often rebuild total turnover. |
| Time to hire vs time to fill | Hire clocks the candidate journey; fill usually starts at req open. |
| Retention vs turnover | Retention tracks a starting cohort remaining; turnover uses average headcount and exits. |
| Internal fill vs promotion rate | Internal fill is share of filled reqs; promotion rate is promotions vs headcount. |
Glossary references
Reinforce entities by pairing percent language with conversion pages when learners mix fractions, decimals, and ratios.
❓ Frequently Asked Questions
Which calculator for regrettable exits?
Use voluntary turnover (or attrition) and segment regrettable exits in your source data before calculating.
Do these replace an HRIS?
No. They compute standard formulas from your exported counts—HRIS remains the system of record.
Where is engagement or NPS?
See the Professional hub for NPS and engagement score tools linked from this page.
How do funnel rates connect?
Application→interview, interview→offer, and offer acceptance are sequential yields—keep stage definitions consistent.