Skip to content
ENExplore Calculators

Hospital Length Of Stay Estimate Calculator

Work out hospital length of stay estimate instantly with clear inputs, formula shown and shareable results.

About Hospital Length Of Stay Estimate Calculator

Combines the uncomplicated stay with the probability-weighted extra days from complications to give an expected length of stay.

Formula

Expected value

Expected stay = base days + probability of complication x extra days

Worked example

With the default values below, Hospital Length Of Stay Estimate Calculator returns Expected length of stay of 5.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Expected uncomplicated stayaccepts 0.5–60 days
4 days
Probability of a complicationaccepts 0–100
20
Additional days if a complication occursaccepts 0.5–60 days
5 days

Results

Expected length of stay
5.00 days
Probability-weighted extra days
1.00 days
Stay if a complication occurs
9.0 days
Expected stay
120 h

Step by step

  1. 1Values used
  2. 2Expected value
  3. 3Expected length of stay= 5.00 days
  4. 4Probability-weighted extra days= 1.00 days
  5. 5Stay if a complication occurs= 9.0 days
  6. 6Expected stay= 120 h

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why is the expected stay not a typical stay?

Length of stay distributions are right skewed, so the mean exceeds the median that most patients experience.

How is this used in planning?

Multiplying expected stay by admissions gives the bed days a service needs to fund.

Related Calculators

Hospital Length Of Stay Estimate Calculator | Calcrivo