Weather and Climate

P Wave Travel Time Calculator
Enter epicentral distance (km) and P wave velocity (km/s) to get travel time in seconds, minutes, and hours, plus seismic zone and crust type.
Wind Chill Calculator
Compute wind chill from air temperature in °F and wind speed in mph to see the feels-like temperature and plan for cold, windy conditions.
Rainfall Calculator
Enter rainfall amount (mm) and catchment area (m²) to calculate collected water volume (m³) for quick, simple water planning.
Lightning Distance Calculator
Enter the seconds between a lightning flash and thunder to estimate how far away the strike is, calculated in kilometers using the 5-second rule.
Heat Index Calculator
Enter temperature and relative humidity to calculate the heat index in Celsius or Fahrenheit, and get the feels-like temperature for your conditions.
Dew Point Calculator
Calculate dew point easily with temperature and relative humidity inputs. Supports both Celsius and Fahrenheit. Get accurate results for meteorology, HVAC, and climate control applications.