Medical Calculator
SuperSimple
QTc Calculator
Fast, Accurate QT Correction
A streamlined tool for healthcare professionals and medical students to calculate corrected QT intervals at the bedside. No clutter, no ads — just the calculation you need.
Prolonged
Compare results
Everything you need, nothing you don't
Built for the bedside. Designed for speed and accuracy when every second counts.
Instant Bazett Calculation
Enter QT interval and heart rate to get immediate QTc results using the gold-standard Bazett formula.
AFib / Tachycardia Mode
One tap displays three recommended alternative formulas — Framingham, Fridericia, and Hodges — for more accurate corrections at elevated heart rates.
Clear Interpretation
Color-coded results instantly show Normal, Borderline, or Prolonged status so you can assess at a glance.
Apple Watch Support
Full-featured calculator right on your wrist for quick bedside calculations — no need to reach for your phone.
Clean, Focused Design
No clutter, no ads, no unnecessary features. Just the calculation you need, designed for clinical efficiency.
Simple by design, powerful by nature
Two modes. One purpose. Get the QTc value you need in seconds.
Clean Input
Enter QT interval in milliseconds and heart rate in BPM. Toggle AFib/Tachycardia mode when needed. That's it.
Multi-Formula Comparison
AFib/Tachycardia mode reveals Framingham, Fridericia, and Hodges formulas alongside Bazett — each with color-coded status.
Why multiple formulas matter
Bazett's formula can overcorrect at high heart rates. For patients with atrial fibrillation or tachycardia, alternative formulas provide more reliable QTc values.
Bazett
DefaultQTc = QT / √RRThe gold-standard formula, widely used in clinical practice. Best suited for normal heart rates (60–100 bpm).
Can overcorrect at high heart rates
Framingham
AFib RecommendedQTc = QT + 154(1 − RR)Linear correction that performs well across a wide range of heart rates. Preferred for variable RR intervals in atrial fibrillation.
Preferred for AFib
Fridericia
Clinical TrialsQTc = QT / ∛RRCube-root correction that reduces overcorrection at elevated heart rates. Increasingly recommended in clinical trials and drug safety studies.
Better at high heart rates
Hodges
TachycardiaQTc = QT + 1.75(HR − 60)Linear heart-rate-based correction that provides stable results across tachycardic ranges. Simple and reliable for rapid assessment.
Stable in tachycardia
QTc Interpretation Guide
Normal
< 450 ms
Borderline
450–500 ms
Prolonged
> 500 ms
QTc on your wrist
Full-featured calculator right on your Apple Watch. Quick bedside calculations without reaching for your phone.
Quick Input
Enter QT and HR values
Instant Results
Color-coded status at a glance
Ready for your next shift?
Download SuperSimple QTc Calculator and get fast, accurate QT corrections at the bedside. Free, with no ads and no tracking.
Medical Disclaimer
This app is intended for educational purposes only. It is not a substitute for professional medical judgment. Always consult qualified healthcare providers for clinical decision-making.