Health & Fitness
QTc Calculator
Calculate corrected QT interval (QTc) from measured QT and heart rate using Bazett's formula.
Preparing your result…
What this calculator does
Calculates QTc Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
QTc (Bazett) = QT ÷ √(RR interval), RR = 60 ÷ heart rate
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Bazett QTc=QT/sqrt(RR), RR=60/HR in seconds. With QT entered in ms and normalized RR in seconds, report QTc in ms. For Fridericia, QTc=QT/RR^(1/3), if that separately named option is offered.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Require measured QT>0 and HR>0. Identify Bazett clearly; it over-/under-corrects at extreme rates. QT measurement, rhythm, conduction delay and drugs require clinical interpretation; the output alone does not establish a diagnosis.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Measured QT interval (ms) | Heart rate (bpm) | Corrected QT (QTc) |
|---|---|---|---|
| Worked example | 400 | 70 | 432.0494 ms |
| Half the amounts | 200 | 35 | 152.7525 ms |
| Double the amounts | 700 | 140 | 1,069.2677 ms |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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