Rainfall calculator, metric units
How much water falls during a storm?
Use our English system version.
It is the middle of July and both you and your tomatoes are wilting in your yard, both looking to the sky and hoping for rain. Or, maybe a low-pressure cell has been napping overhead, and your arm is hurting from holding that umbrella while you watch your basement fill up with water. Either way, you would like to know how much rain has fallen—how many gallons have come down from the skies onto your roof, yard, block, or town.
You might even want to know how many baths you could get from your rainstorm?
In the form below, choose an area(s) and a rainfall amount to see how many gallons of water fell from the sky onto that area. I think you'll be surprised about much rain really does fall during a rainstorm.
Note: You can enter numbers into any or all of the boxes below:
- Method A: Use METERS (for areas such as your roof or yard).
- Method C: Use SQUARE KILOMETERS (for large areas).
Rates of rainfall
- Drizzle, very small droplets.
- Slight (fine) drizzle: Detectable as droplets only on the face, car windscreens and windows.
- Moderate drizzle: Windows and other surfaces stream with water.
- Heavy (thick) drizzle: Impairs visibility and is measurable in a raingauge, rates up to 1 mm per hour.
- Rain, drops of appreciable size and may be described as small to large drops. It is possible to have rain drops within drizzle!
- Slight rain: Less than 0.5 mm per hour.
- Moderate rain: Greater than 0.5 mm per hour, but less than 4.0 mm per hour.
- Heavy rain: Greater than 4 mm per hour, but less than 8 mm per hour.
- Very heavy rain: Greater than 8 mm per hour.
- Slight shower: Less than 2 mm per hour.
- Moderate shower: Greater than 2 mm, but less than 10 mm per hour.
- Heavy shower: Greater than 10 mm per hour, but less than 50 mm per hour.
- Violent shower: Greater than 50 mm per hour.