# Nurse Staffing Ratio Calculator

> Work out the nurse-to-patient ratio on a shift, the nurses needed to meet a target ratio you set, and how many more nurses the unit needs.

Category: Healthcare operations · Applies to: Worldwide · Last updated: 2026-10-29
Interactive calculator: https://calculators.geekmidst.com/calculators/nurse-staffing-ratio-calculator

The staffing ratio is the patients on the unit divided by the nurses on duty. Enter your own target ratio, because required ratios differ by country, state and type of unit.

Also called: Nurse-to-patient ratio calculator.

## Inputs
- Patients on the unit (default 26)
- Nurses on duty (default 5)
- Target patients per nurse (default 4)

## Results
- Nurses needed for the target
- Current ratio (nurse : patients)
- Patients per nurse
- Additional nurses needed

## Formula

```
Patients per nurse = Patients ÷ Nurses;  Nurses needed = ⌈Patients ÷ Target patients per nurse⌉;  Shortfall = max(0, Nurses needed − Nurses on duty)
```

Where:
- Patients: patients on the unit for the shift
- Nurses: nurses with a patient assignment (exclude the charge nurse if they take no patients)
- Target: maximum patients per nurse under your policy

## Worked example
1. Current load = 26 ÷ 5 = 5.2 patients per nurse.
2. For a 1:4 target, 26 ÷ 4 = 6.5, rounded up to 7 nurses.
3. Shortfall = 7 − 5 = 2 nurses.

**Result:** Twenty-six patients with five nurses is a 1 : 5.2 ratio; meeting a 1:4 target needs seven nurses, two more than on duty.

## What the result means

The ratio is a floor, not the whole picture: patient acuity, skill mix and unit layout also determine safe staffing. Use the result to flag shifts that miss the target, then apply your acuity tool.

## Assumptions and limits
- Every nurse counted takes a full patient assignment.
- The target ratio is the one you enter; no legal ratio is built in.
- Does not account for acuity, admissions and discharges during the shift, or breaks.

## Questions

### Are nurse-to-patient ratios set by law?

In some places, for some units. Requirements differ widely, so check your regulator or hospital policy and enter that figure as the target.

### Why round up?

You cannot roster half a nurse, so meeting the target needs the next whole number.

## Related calculators
- [Bed Occupancy Rate Calculator](https://calculators.geekmidst.com/calculators/bed-occupancy-rate-calculator)
- [Doctor Utilisation Calculator](https://calculators.geekmidst.com/calculators/doctor-utilization-calculator)
- [Ratio Calculator](https://calculators.geekmidst.com/calculators/ratio-calculator)

Source: GM¹X CalcVerse — https://calculators.geekmidst.com/calculators/nurse-staffing-ratio-calculator