How to use the rainfall intensity calculator
Convert a storm rain depth and duration into rainfall intensity in millimetres per hour. Enter rain depth, storm duration in the fields above; the rainfall intensity, rainfall rate are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “rainfall intensity”, “rain rate calculator”, “mm per hour storm”, “calculate rainfall intensity”, “find rainfall intensity”.
Formula
Variables
- depth — Rain depth (mm)
- dur — Storm duration (min)
Worked example
With rain depth = 25 mm, storm duration = 30 min, the calculator gives rainfall intensity ≈ 50 mm/h; rainfall rate ≈ 0.8333333 mm/min.
Frequently asked questions
What is the rainfall intensity calculator used for?
Convert a storm rain depth and duration into rainfall intensity in millimetres per hour. It helps with questions such as “rainfall intensity”, “rain rate calculator”, “mm per hour storm”.
What is the formula for the rainfall intensity calculation?
Rainfall intensity (mm/h) = depth × 60 / dur. Rainfall rate (mm/min) = depth / dur. Here depth is rain depth (mm), dur is storm duration (min).
What inputs do I need for the rainfall intensity calculator?
You need rain depth in mm, storm duration in min. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the rainfall intensity calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the rainfall intensity result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.