Corrected QT Interval (QTc) Bazett, Fridericia, Framingham & Hodges Calculator

Compute QTc (ms) via Bazett, Fridericia, Framingham, and Hodges from QT and Heart Rate.

Corrected QT Interval (Bazett QTc)
467.47 ms
Fridericia QTc (QT / ∛RR) 447.47 ms
Framingham Linear QTc 445.54 ms
Hodges Linear QTc 441.5 ms
Inputs
⚡ Scenarios:
ms
Measured unadjusted ECG QT interval in milliseconds (ms).
bpm
Ventricular heart rate in beats per minute (bpm).
Results & Graph
Corrected QT Interval (Bazett QTc)
467.47 ms
Fridericia QTc (QT / ∛RR)
447.47 ms
Framingham Linear QTc
445.54 ms
Hodges Linear QTc
441.5 ms

Corrected QT Interval (Bazett QTc)

Graph 1 • QTc Interval (Bazett / Fridericia) • Domain Architecture & Live Telemetry Maps Measured Qt Interval Ms, Ventricular Heart Rate Bpm through QTc Interval (Bazett / Fridericia) Formula.
QTc Interval (Bazett / Fridericia) • Clinical & Physiological Reference Scale Low / Baseline Target / Reference Elevated / Watch High / Action Corrected QT Interval (Bazett QTc): 467.47 ms Fridericia QTc (QT / ∛RR) 447.47 ms Framingham Linear QTc 445.54 ms Hodges Linear QTc 441.5 ms
Graph 2 • Corrected QT Interval (Bazett QTc) Across Measured Qt Interval Ms Sweep (40% → 160%) Evaluates RR_sec = 60 / HR; QTc_Bazett = QT / √RR; QTc_Fridericia = QT / RR^(1 across 7 operating points (current input highlighted).
0 ms 411.4 ms 822.8 ms 187.0 164ms 280.5 246ms 374.0 328ms 467.5 410ms 561.0 492ms 654.5 574ms 748.0 656ms
Graph 3 • Joint Sensitivity: Measured Qt Interval Ms × Ventricular Heart Rate Bpm Compares Corrected QT Interval (Bazett QTc) when Ventricular Heart Rate Bpm is shifted +25% (solid) vs. −25% (dashed).
0 ms 373.7 ms 747.4 ms --- Ventricular Heart Rate Bpm @ 75% 365.9 -30% 444.3 -15% 522.6 +0% 601.0 +15% 679.4 +30%
Summary: At 78 bpm (RR = 0.769 s), QT 410 ms corrects to 467 ms (Bazett), 447 ms (Fridericia), 446 ms (Framingham), and 442 ms (Hodges).
Summary: At 78 bpm (RR = 0.769 s), QT 410 ms corrects to 467 ms (Bazett), 447 ms (Fridericia), 446 ms (Framingham), and 442 ms (Hodges).
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Formula & Mathematical Methodology: QTc Interval (Bazett / Fridericia) Formula

RRsec = 60 / HR
QTcBazett = QT / √RR
QTcFridericia = QT / RR1/3
QTcFramingham = QT + 154 × (1 − RR)
RR_sec = 60 / HR; QTc_Bazett = QT / √RR; QTc_Fridericia = QT / RR^(1/3); QTc_Framingham = QT + 154 × (1 − RR)
  • measuredQtIntervalMs: Measured Qt Interval Ms (ms)
  • ventricularHeartRateBpm: Ventricular Heart Rate Bpm (bpm)

Rounding: Clinical scores round to statutory integer or decimal precision; physiological metrics round to 2 decimal places.

Worked Example: Clinical / Physiology Scenario: QTc Interval (Bazett / Fridericia)

Compute QTc (ms) via Bazett, Fridericia, Framingham, and Hodges from QT and Heart Rate.

  1. Enter lab values, anthropometric measurements, or performance test metrics.
  2. Evaluate the reference equation: RR_sec = 60 / HR; QTc_Bazett = QT / √RR; QTc_Fridericia = QT / RR^(1/3); QTc_Framingham = QT + 154 × (1 − RR).
  3. Inspect the primary classification, supporting indices, and 3 SVG charts.
Result: Computes QTc Interval (Bazett / Fridericia) via RR_sec = 60 / HR; QTc_Bazett = QT / √RR; QTc_Fridericia = QT / RR^(1/3); QTc_Framingham = QT + 154 × (1 − RR).

Frequently Asked Questions

How does the Corrected QT Interval (QTc) Bazett, Fridericia, Framingham & Hodges Calculator compute its result?

It evaluates RR_sec = 60 / HR; QTc_Bazett = QT / √RR; QTc_Fridericia = QT / RR^(1/3); QTc_Framingham = QT + 154 × (1 − RR) directly in your browser and updates three custom SVG visualizations in real time.

Can I use Goal Seek to solve backwards for a target lab value or pace?

Yes. Click "🎯 Goal Seek" in the results toolbar to solve backwards for any numeric input parameter.

Are my health and biometric inputs kept private?

Yes. All calculations run 100% locally on your device with zero external transmission.

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Corrected QT Interval (QTc) Bazett, Fridericia, Framingham & Hodges Calculator: inputs, method, and how to read the result

Compute QTc (ms) via Bazett, Fridericia, Framingham, and Hodges from QT and Heart Rate.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Measured Qt Interval Ms: Measured unadjusted ECG QT interval in milliseconds (ms).
  • Ventricular Heart Rate Bpm: Ventricular heart rate in beats per minute (bpm).

What the calculation includes

With the default values shown, Corrected QT Interval (Bazett QTc) is 467.47 ms. The calculation follows QTc Interval (Bazett / Fridericia) Formula; the formula and variable definitions above show how the inputs combine.

One-input check: With the other defaults held constant, changing Measured Qt Interval Ms from 410 ms to 451 ms changes Corrected QT Interval (Bazett QTc) from 467.47 ms to 514.22 ms. This is a comparison inside the calculator's stated model, not a prediction.

Where to use caution

  • Uses peer-reviewed clinical and sports physiology formulas.
  • For educational and informational reference only; clinical scores do not replace physician judgment or laboratory reference ranges.

Scope: Global Clinical & Sports Science Consensus Check the assumptions and limitations against your situation before relying on the estimate.

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