Cardiac Index Calculator (CI)

Cardiac Index Calculator (CI) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Cardiac Index Calculator computes cardiac index (CI) in L/min/m² from cardiac output, height, and weight. It calculates body surface area (BSA) with the Mosteller formula and compares the result with the stated normal range of 2.5–4.0 L/min/m². This tool is for informational use and is not medical advice.

When to use

Estimate cardiac index when cardiac output, height, and weight are available.
Normalize cardiac output for body size when reviewing hemodynamic measurements.
Check whether a calculated CI falls within the listed normal range of 2.5–4.0 L/min/m².

How it works

1Enter cardiac output in L/min, height in centimeters, and weight in kilograms.
2The calculator computes BSA using √(height × weight / 3600), the Mosteller formula.
3It divides cardiac output by BSA using CI = CO / BSA.
4The JSON result includes BSA, cardiac index, category, calculation method, and model information.

Use cases

Cardiology review of cardiac output adjusted for patient body size.
Critical care documentation of calculated hemodynamic values.
Educational practice with the Mosteller BSA and cardiac index formulas.

Examples

1. Normal adult cardiac index calculation

Clinician or medical learner

Background

A cardiac output measurement is available for an adult patient, along with height and weight.

Problem

Calculate BSA and determine the cardiac index from CO, height, and weight.

How to use

Enter cardiac output 5 L/min, height 175 cm, weight 75 kg, and select 2 decimal places.

{"co":5,"height":175,"weight":75,"decimalPlaces":2}

Outcome

The calculator returns BSA 1.91 m² and CI 2.62 L/min/m², categorized as a normal cardiac index.

2. Low cardiac index example

Critical care clinician

Background

A patient has a cardiac output of 2.8 L/min and measured height and weight of 170 cm and 70 kg.

Problem

Calculate the body-size-adjusted cardiac output for hemodynamic review.

How to use

Enter cardiac output 2.8 L/min, height 170 cm, weight 70 kg, and select 2 decimal places.

FAQ

What is the cardiac index formula?

Cardiac index is calculated as CI = cardiac output (CO) / body surface area (BSA).

How is BSA calculated?

BSA is calculated with the Mosteller formula: √(height in cm × weight in kg / 3600).

What inputs are required?

Enter cardiac output in L/min, height in cm, and weight in kg. Decimal places are optional.

What is the normal cardiac index range?

The stated normal range is 2.5–4.0 L/min/m².

What does the calculator return?

It returns a JSON result containing BSA, cardiac index, a category, the method, and model information.

{"co":2.8,"height":170,"weight":70,"decimalPlaces":2}

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Examples that match this tool

Continue with connected tools and hubs

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Normal adult cardiac index calculation

2. Low cardiac index example

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