Weather and Climate

  • Windsock Wind Speed Calculator
    Estimate wind speed from a windsock's angle. Enter the angle from vertical (0–90°) and the full-extension speed to get knots, mph, and km/h.
  • Temperature Unit Converter (Kelvin, Celsius, Fahrenheit, Rankine)
    Convert any temperature between Kelvin, Celsius, Fahrenheit and Rankine at once. Enter one value, pick its unit, and get all four scales instantly.
  • Altitude to Air Pressure Calculator
    Calculate local atmospheric pressure at any altitude from elevation, air temperature and sea-level pressure using the standard barometric formula.
  • Destination Temperature and Air Pressure Estimator (from elevation change)
    Estimate temperature and atmospheric pressure at a destination from your current temperature, pressure and altitude using the standard-atmosphere lapse-rate and barometric formula.
  • Sea-Level Pressure Correction Calculator
    Reduce a station barometric pressure to equivalent sea-level pressure using altitude and temperature with the standard barometric formula. Universal physics tool.
  • Discomfort Index (THI) Calculator
    Calculate the Discomfort Index (Temperature-Humidity Index) from air temperature and relative humidity, and see the comfort sensation category instantly.
  • Solar Elevation and Azimuth Daily Calculator
    Compute the Sun's elevation (altitude) and azimuth for every hour of a day at any latitude, longitude and date. Universal astronomy; defaults to Tokyo, UTC+9.
  • Annual Solar Elevation & Azimuth Calculator
    Compute the Sun's elevation (altitude) and azimuth at your location for each week of a year at a fixed local clock time. Works worldwide; default Tokyo/JST.
  • Sunlight Hours Affected by a South-Side Building
    Estimate how a building to the south blocks your home's direct sunlight. Compute residual sunlight hours, blocked window and critical roofline angle by latitude and date.
  • Hot Car Temperature Calculator
    Estimate how hot the inside of a parked car gets over time. Enter outside temperature and minutes to see the dangerous interior heat rise.
  • Earthquake Epicenter Distance Calculator (Omori's Formula)
    Estimate the distance to an earthquake's hypocenter from the P-wave to S-wave arrival gap using Omori's formula d = k x t. Universal seismology tool.
  • Earthquake Energy Calculator (Magnitude to Joules to TNT)
    Convert earthquake moment magnitude to seismic energy in joules and equivalent tons of TNT, or go from energy back to magnitude. Universal Gutenberg-Richter relation.
  • Tree Benefits Calculator
    Estimate the annual CO₂ sequestered by your trees. Enter the number of trees and CO₂ absorbed per tree to see total carbon captured per year.
  • Temperature Conversion Calculator
    Convert temperatures between Celsius, Fahrenheit and Kelvin instantly. Enter a value and unit to see all three scales with exact formulas.
  • Celsius to Fahrenheit Calculator
    Convert Celsius to Fahrenheit instantly. Enter any °C value and get the exact °F result using the standard °F = °C × 9/5 + 32 formula.
  • 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.
  • 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.
  • Rainfall Calculator
    Enter rainfall amount (mm) and catchment area (m²) to calculate collected water volume (m³) for quick, simple water planning.
  • 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.
  • 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.
  • 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.

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