QTc Calculator

Enter a heart rate and the measured QT to see all five rate-corrected QTc values (recommended formula first), sex-specific interpretation, change from baseline, and torsades-de-pointes risk context. Toggle Teaching mode for a plain-language walkthrough. Everything runs in your browser — nothing you type is sent anywhere.

Patient's QT-relevant medications

Search and add the drugs your patient is actually taking. The list covers this database's psychiatric medications plus common QT-prolonging agents (CredibleMeds). Each shows its QT signal — measured prolongation, measured QT-neutral, or a CredibleMeds TdP-risk category.

Key references — QTc & psychiatric medications
  1. Drew BJ, Ackerman MJ, Funk M, et al. (2010). Prevention of torsade de pointes in hospital settings: a scientific statement from the AHA and the ACCF. Circulation. — Foundational statement — QTc thresholds, monitoring, and TdP prevention.
  2. Beach SR, Celano CM, Sugrue AM, et al. (2018). QT prolongation, torsades de pointes, and psychotropic medications: a 5-year update. Psychosomatics. — The key review of QTc risk across psychotropics.
  3. Tisdale JE, Jaynes HA, Kingery JR, et al. (2013). Development and validation of a risk score to predict QT interval prolongation in hospitalized patients. Circulation: Cardiovascular Quality and Outcomes. — The validated TdP risk score used in the risk-factor section.
  4. Ray WA, Chung CP, Murray KT, Hall K, Stein CM (2009). Atypical antipsychotic drugs and the risk of sudden cardiac death. New England Journal of Medicine. — Dose-related sudden-cardiac-death risk with antipsychotics.
  5. Vandael E, Vandenberk B, Vandenberghe J, Willems R, Foulon V (2017). Risk factors for QTc-prolongation: systematic review of the evidence. International Journal of Clinical Pharmacy. — Systematic review underpinning the modifiable risk factors.
  6. Schwartz PJ, Moss AJ, Vincent GM, Crampton RS (1993). Diagnostic criteria for the long QT syndrome: an update. Circulation. — Congenital long-QT syndrome (Schwartz score).
  7. Woosley RL, Heise CW, Gallo T, Woosley RD, Romero KA (2024). QTdrugs List — CredibleMeds (AzCERT). Arizona Center for Education and Research on Therapeutics. — Continuously-updated registry classifying drugs by TdP risk.

QTc thresholds follow the AHA/ACCF/HRS statement; medication QTc values and their citations come from the psychtools medications database.