Pressure Tendency Calculator

How to Use This Calculator

1. Enter your current barometric pressure in millibars (mb)
2. Enter the barometric pressure from your previous measurement in millibars (mb)
3. Set the measurement time for both readings
4. Click the "Calculate" button to determine the pressure tendency

Understanding Pressure Tendency

Pressure tendency is the rate of change of barometric pressure over time. It's a valuable tool for weather forecasting:

• Rising Pressure: Often indicates improving weather conditions (clear skies, high pressure)
• Falling Pressure: Often indicates deteriorating weather conditions (stormy weather, low pressure)
• Stable Pressure: Suggests no significant weather changes are expected

Practical Tips

For best results:

• Take measurements at the same time each day for consistent tracking
• Use a reliable barometer with accurate readings
• Consider taking readings before and after weather fronts pass for more dramatic tendencie

Example Calculation

If your current pressure is 1015.2 mb and your previous pressure was 1012.8 mb:

Tendency = 1015.2 mb - 1012.8 mb = +2.4 mb

This indicates a rising pressure tendency, suggesting improving weather conditions.