Licences
Licences and credits
What this site is built with, and under which licences.
What the site uses
The pages use your device's own system fonts and no third-party code. The only script from outside this site is our self-hosted Umami counter (see privacy).
| Part | By | Licence | Used for |
|---|---|---|---|
| IBM Plex Sans | IBM Corp. | SIL Open Font License 1.1 | Lettering drawn into the share image and the app icons (not served as a font) |
The licence text is at openfontlicense.org.
Formulas and data
The dew-point example uses the Magnus formula with the coefficients published by the World Meteorological Organization in WMO-No. 8, Guide to Instruments and Methods of Observation, Volume I (2023 edition), Annex 4.B. When the calculators ship, every data source they use (for example solar and weather data, and published tariff tables) will be listed here with its licence and the attribution it asks for.
Our own work
The pages, the worked example, the temperature scale and the WattNumbers gauge mark are our own work.