Cardiology & ECG
Every cardiology & ecg calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- ASCVD Pooled Cohort Risk CalculatorThe 2013 ACC/AHA pooled cohort equations, with all four race- and sex-specific coefficient sets, the validity range they refuse outside, and an honest account of the race term and of how far they over-estimate.
- Corrected QT in Atrial Fibrillation CalculatorIn atrial fibrillation one beat's QTc means little. This takes the QT at the longest and the shortest RR interval of a 10-second ECG and averages them, one of the two approaches the American Heart Association sets out.
- Heart Rate from RR Interval CalculatorConvert an RR interval into a heart rate from whatever you measured it in — millimetres at 25 or 50 mm/s, large boxes, milliseconds or seconds — and convert any other interval measured the same way into milliseconds.
- Left Ventricular Mass Index CalculatorDevereux's formula for left ventricular mass from three linear echo measurements, indexed to body surface area and read against the ASE and EACVI limits — with the relative wall thickness that decides which geometry it is.
- QTc Bazett Formula CalculatorBazett's QTc is the correction every ECG cart prints and the one that behaves worst. Enter the QT with either the heart rate or the RR interval, and see how far it sits from Fridericia on the same trace.
- QTc Fridericia, Framingham and Hodges CalculatorThe three corrections that behave better than Bazett, on one trace at once. Fridericia is the headline because ICH E14 calls it the more accurate of the pair it requires; the other three sit beside it so the disagreement is visible.
- QTc in Bundle Branch Block CalculatorA wide QRS inflates the QT without lengthening repolarisation. This applies Bogossian's modified QT — the measured QT minus 48.5% of the QRS — and corrects it with Hodges, the pairing that agreed most closely with the narrow-QRS QTc.
- Sokolow-Lyon and Cornell LVH Criteria CalculatorScore one ECG against three published voltage criteria for left ventricular hypertrophy at once — Sokolow-Lyon, Cornell voltage and the Cornell voltage-duration product — with the sensitivity each achieved and against what standard.