K Index Thunderstorm Calculator
Compute the K index from temperatures and dew points to judge storm potential.
Compare Your Options And Get Clear Answers
Compute the K index from temperatures and dew points to judge storm potential.
K Index Thunderstorm Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
K Quick Guide
Typical values for reference.
| 850 hPa temperature (C) | 500 hPa temperature (C) | 850 hPa dew point (C) | K index |
|---|---|---|---|
| 18 | -10 | 14 | 34.0 |
| 22 | -8 | 18 | 40.0 |
| 10 | -15 | 2 | 11.0 |
| 20 | -12 | 16 | 40.0 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
K Index Thunderstorm Calculator FAQ
Answers to common questions about this calculator.
It uses the formula shown with your inputs. Real conditions vary, so treat it as a guide.
K = (T850 – T500) + Td850 – dewpoint depression
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.
Yes. Replace each input with your own figures and the result updates instantly.