16 free meteorology calculators and tools. Solve real-world meteorology problems instantly with accurate, step-by-step results on ApexCalc.
| Constant | Symbol | Value |
|---|---|---|
| Speed of light | c | 2.99792458×10⁸ |
| Planck's constant | h | 6.62607015×10⁻³‴ |
| Boltzmann constant | kʙ | 1.380649×10⁻²³ |
| Avogadro's number | Nₐ | 6.02214076×10²³ |
| Gravitational constant | G | 6.6743×10⁻¹¹ |
| Gas constant | R | 8.31446 |
| Elementary charge | e | 1.602176634×10⁻¹⁹ |
| Electron mass | mₑ | 9.1093837015×10⁻³¹ |
| Proton mass | mₚ | 1.67262192369×10⁻²⁷ |
| Fine-structure constant | α | 7.2973525693×10⁻³ |
Classify hurricanes and tropical cyclones by sustained wind speed using the Saffir-Simpson Hurricane Wind Scale. Includes storm surge and damage estimates.
Classify tornado intensity using the Enhanced Fujita Scale based on observed damage indicators and degrees of damage.
Calculate the apparent temperature (heat index) combining air temperature and relative humidity. Uses Rothfusz regression.
Calculate wind chill equivalent temperature using the 2001 NWS/Environment Canada formula. Valid for temps ≤50°F and winds ≥3 mph.
Calculate dewpoint temperature and relative humidity from air temperature using the Magnus formula. Includes frost point at sub-zero temperatures.
Calculate probability of precipitation (POP) and expected rainfall from forecast probability and historical averages.
Calculate the Standardized Precipitation Index (SPI) and Palmer Drought Severity Index (PDSI) for drought monitoring.