Calculating your corrected QT (qtc) is straightforward once you know the QTc Calculator (Bazett) formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the QTc Calculator (Bazett).
What is QTc Calculator (Bazett)?
The QTc Calculator (Bazett) calculation tells you your corrected QT (qtc) from a few simple inputs. The figure you are solving for here is the corrected QT (qtc).
The QTc Calculator (Bazett) formula
The core formula is:
Corrected QT (QTc) = Measured QT interval ÷ √(60 ÷ Heart rate)Here is what each input means:
- Measured QT interval — a value measured in ms. Example: 400 ms.
- Heart rate — a value measured in bpm. Example: 60 bpm.
How to calculate it step by step
- Write down the measured qt interval (for example, 400 ms).
- Write down the heart rate (for example, 60 bpm).
- Apply the formula above to get your corrected QT (qtc).
- Double-check the result with the QTc Calculator (Bazett).
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Measured QT interval | 400 ms |
| Heart rate | 60 bpm |
| Corrected QT (QTc) | 400 |
With measured qt interval of 400 ms and heart rate of 60 bpm, the corrected QT (qtc) works out to 400.
Example 2
With measured qt interval of 800 ms and heart rate of 60 bpm, the corrected QT (qtc) works out to 800.
| Result | Value |
|---|---|
| Corrected QT (QTc) | 800 |
Example 3
With measured qt interval of 200 ms and heart rate of 60 bpm, the corrected QT (qtc) works out to 200.
| Result | Value |
|---|---|
| Corrected QT (QTc) | 200 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
- These figures are general estimates, not medical advice — check with a qualified professional before acting on them.
Prefer not to do the maths by hand? — the QTc Calculator (Bazett) does it instantly, for free, with the formula and a worked example built in.
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