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RCRI Calculator

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Calculate the Revised Cardiac Risk Index (Lee Index) to estimate perioperative cardiac risk before noncardiac surgery, with published risk-class percentages.

Reviewed by the thecalcu.com team · Last updated July 6, 2026

High-Risk Surgery (Intraperitoneal, Intrathoracic, or Suprainguinal Vascular) (1 pt)

History of Ischemic Heart Disease (1 pt)

History of Congestive Heart Failure (1 pt)

History of Cerebrovascular Disease (1 pt)

Insulin-Treated Diabetes Mellitus (1 pt)

Preoperative Creatinine > 2.0 mg/dL (1 pt)

RCRI Score

0/ 6

Risk Class

—

Estimated Major Cardiac Risk—

Not a substitute for clinical judgment. Perioperative risk counseling and decisions about further cardiac workup must be made by a qualified healthcare provider, not from this tool alone.

What is a RCRI?

The RCRI Calculator computes the Revised Cardiac Risk Index (Lee Index), a validated tool that estimates the risk of major cardiac complications following noncardiac surgery. The score sums six binary clinical factors: high-risk surgery, ischemic heart disease history, congestive heart failure history, cerebrovascular disease history, insulin-treated diabetes, and significant renal impairment.

Select yes or no for each factor to see your total score, risk class, and the corresponding published cardiac risk percentage. For a related perioperative or cardiac risk tool, see the Gupta Risk Calculator and Duke Treadmill Score Calculator.

Why Use an RCRI Calculator?

Manually tracking six clinical factors and mapping the resulting sum to the correct risk class and percentage is easy to get wrong, especially under time pressure in a preoperative clinic. This calculator handles the tallying and lookup instantly and shows exactly which factors are contributing to the total.

It's a useful quick reference for reviewing a patient's perioperative risk profile or for students checking a worked RCRI example against the original published criteria.

Who Should Use This Calculator?

Anesthesiology, surgery, and internal medicine trainees learning preoperative cardiac risk assessment can use this tool to check worked RCRI examples against the published scoring system. Patients preparing for noncardiac surgery who want to understand the terminology their care team uses may find this a useful educational reference.

This calculator is strictly for informational and educational purposes and is not a substitute for a physician's clinical judgment. Decisions about preoperative cardiac testing, perioperative monitoring, and surgical clearance carry real, serious consequences and must always be made by a qualified healthcare provider who knows the patient's complete history, never from this tool alone.

What Insights Does the RCRI Calculator Give You?

RCRI Score is the primary result, your total points out of a possible 6, based on the risk factors you selected.

Risk Class translates that score into the original Class I through Class IV categories from the Lee et al. 1999 validation study.

Estimated Major Cardiac Risk shows the published percentage risk of a major cardiac event associated with your risk class, giving context for the preoperative discussion.

How to use this RCRI calculator

  1. Select Yes or No for High-Risk Surgery (Intraperitoneal, Intrathoracic, or Suprainguinal Vascular).
  2. Select Yes or No for History of Ischemic Heart Disease.
  3. Select Yes or No for History of Congestive Heart Failure.
  4. Select Yes or No for History of Cerebrovascular Disease.
  5. Select Yes or No for Insulin-Treated Diabetes Mellitus.
  6. Select Yes or No for Preoperative Creatinine > 2.0 mg/dL.
  7. Review your RCRI Score, Risk Class, and Estimated Major Cardiac Risk, and discuss the result with your surgical and anesthesia team before proceeding.
Show formula & methodology ↓Show less ↑

Formula & Methodology

The RCRI sums the following points, each worth 1 point if present:

- High-risk surgery: 1 point
- Ischemic heart disease: 1 point
- Congestive heart failure: 1 point
- Cerebrovascular disease: 1 point
- Insulin-treated diabetes: 1 point
- Creatinine > 2.0 mg/dL: 1 point

Risk classes (Lee et al. 1999): Class I (0 points, ~0.4% risk), Class II (1 point, ~1.0% risk), Class III (2 points, ~2.4% risk), Class IV (≥3 points, ~5.4% risk).

Worked example: A patient undergoing intrathoracic surgery (1 point) with a history of ischemic heart disease (1 point) scores 1 + 1 = 2 points total, placing them in Class III with an estimated ~2.4% risk of a major cardiac event, per the original Lee et al. 1999 Circulation validation study.

Frequently Asked Questions

What is the RCRI (Revised Cardiac Risk Index)?
The Revised Cardiac Risk Index, also known as the Lee Index, is a validated clinical tool that estimates the risk of major cardiac complications after noncardiac surgery, based on six clinical factors. It was developed by Lee TH, et al. and published in Circulation in 1999.
What are the six RCRI risk factors?
The six factors are: high-risk surgery (intraperitoneal, intrathoracic, or suprainguinal vascular), a history of ischemic heart disease, a history of congestive heart failure, a history of cerebrovascular disease, insulin-treated diabetes mellitus, and a preoperative creatinine above 2.0 mg/dL. Each present factor adds one point, for a maximum score of 6.
What do the RCRI risk classes mean?
A score of 0 is Class I with an estimated major cardiac event risk of about 0.4%, a score of 1 is Class II at about 1.0%, a score of 2 is Class III at about 2.4%, and a score of 3 or more is Class IV at about 5.4%, based on the original Lee et al. 1999 validation cohort.
What counts as 'high-risk surgery' for RCRI purposes?
High-risk surgery in the RCRI specifically refers to intraperitoneal, intrathoracic, or suprainguinal vascular procedures, categories associated with greater physiologic stress and higher cardiac complication rates in the original validation study, distinct from other surgery types.
Can the RCRI be used for every type of surgery?
The RCRI was developed and validated specifically for noncardiac surgery in adults; it is not intended for cardiac surgery itself, and its accuracy can vary across different surgical populations and eras compared to the original 1999 cohort.
Does a low RCRI score guarantee no cardiac complications?
The RCRI estimates population-level risk based on the factors present, but it cannot guarantee an individual outcome. A low score reduces the estimated likelihood of a major cardiac event but does not eliminate it, and unexpected complications can still occur.
How is the RCRI used in preoperative evaluation?
Clinicians use the RCRI alongside functional capacity assessment and other clinical judgment to help decide whether additional preoperative cardiac testing, further risk stratification, or perioperative monitoring adjustments are warranted, always as part of a broader evaluation.
Are there newer perioperative risk tools than the RCRI?
Tools such as the Gupta Risk Calculator, using a different set of predictors from the American College of Surgeons NSQIP database, have been developed since the original RCRI and are sometimes used alongside or instead of it depending on institutional preference.
Does insulin-treated diabetes count differently from diet-controlled diabetes?
Yes, only diabetes mellitus requiring insulin treatment counts toward the RCRI score; diabetes managed with oral medications or diet alone does not add a point under the original scoring criteria.
What creatinine threshold is used in the RCRI?
A preoperative serum creatinine greater than 2.0 mg/dL is the specific threshold used in the RCRI, reflecting significant renal impairment as an independent risk factor for perioperative cardiac complications in the original validation study.
Can this calculator replace a preoperative cardiology consultation?
No, this calculator is strictly for informational and educational purposes and reproduces the published RCRI scoring system only. Any decision about further cardiac testing, perioperative risk management, or surgical clearance must be made by a qualified healthcare provider, never from this tool alone.
Is the RCRI relevant to a patient's own understanding of their surgical risk?
It can be, as an educational reference for understanding the terminology a surgical or anesthesia team may use, but the actual risk assessment and any resulting care plan must come from the clinicians directly managing the patient's perioperative care.
Also known as
Lee Index calculatorRevised Cardiac Risk Index calculatorperioperative cardiac risk calculatornoncardiac surgery risk calculatorRCRI score calculator