Drought Index
Calculate Drought Index instantly with the exact formula and a worked example.
Drought Index
Precipitation in the periodmm
Normal precipitation for the same periodmm
Precipitation deficit
40%
Percent of normal
60%
Rating
Moderate drought
More about: Drought Index
What it calculates
The “Drought Index” calculator computes Precipitation deficit in % from 2 parameters: precipitation in the period (mm), normal precipitation for the same period (mm).
Estimates environmental impact and carbon footprint.
Example calculation
With parameters Precipitation in the period = 60 mm, Normal precipitation for the same period = 100 mm the result is 40 %.
How to use
- Enter precipitation in the period and normal precipitation for the same period — each field above is adjustable with a slider.
- Precipitation deficit (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Drought Index calculated?
The Drought Index calculator computes Precipitation deficit (in %) from precipitation in the period, normal precipitation for the same period. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Drought Index calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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