Calculating your cloud base height is straightforward once you know the Cloud Base formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Cloud Base Calculator.
What is Cloud Base?
The Cloud Base calculation tells you your cloud base height from a few simple inputs. The figure you are solving for here is the cloud base height.
The Cloud Base formula
The core formula is:
Cloud base height = (Surface temperature - Dew point) × 125Here is what each input means:
- Surface temperature — a value measured in °C. Example: 25 °C.
- Dew point — a value measured in °C. Example: 15 °C.
How to calculate it step by step
- Write down the surface temperature (for example, 25 °C).
- Write down the dew point (for example, 15 °C).
- Apply the formula above to get your cloud base height.
- Double-check the result with the Cloud Base Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Surface temperature | 25 °C |
| Dew point | 15 °C |
| Cloud base height | 1,250 |
| In feet | 4,101 |
With surface temperature of 25 °C and dew point of 15 °C, the cloud base height works out to 1,250.
Example 2
With surface temperature of 50 °C and dew point of 15 °C, the cloud base height works out to 4,375.
| Result | Value |
|---|---|
| Cloud base height | 4,375 |
| In feet | 14,354 |
Example 3
With surface temperature of 13 °C and dew point of 15 °C, the cloud base height works out to -250.
| Result | Value |
|---|---|
| Cloud base height | -250 |
| In feet | -820 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Cloud Base Calculator does it instantly, for free, with the formula and a worked example built in.
Related calculators
Continue exploring weather calculators with these tools: Wind Chill Calculator, Heat Index Calculator, Dew Point Calculator, Rainwater Harvesting Calculator, Snow Load Calculator.