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Average Temperature CalculatorCalculate the daily mean (average) temperature from the day's high and low using T_avg = (T_max + T_min) / 2. Works in °C or °F.
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Apparent Temperature Calculator (Improved Missenard Formula)Compute the apparent (feels-like) temperature from air temperature, relative humidity and wind speed using the improved Missenard formula. Universal, in degC, %, m/s.
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SMOG Air Quality Index (AQI) CalculatorConvert PM2.5, PM10 or ozone concentration into the US EPA Air Quality Index (AQI) using the official piecewise linear breakpoint formula.
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Annual Solar Elevation & Azimuth CalculatorCompute 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.
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Windsock Wind Speed CalculatorEstimate 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.
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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.
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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.
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Sea-Level Pressure Correction CalculatorReduce a station barometric pressure to equivalent sea-level pressure using altitude and temperature with the standard barometric formula. Universal physics tool.
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Discomfort Index (THI) CalculatorCalculate the Discomfort Index (Temperature-Humidity Index) from air temperature and relative humidity, and see the comfort sensation category instantly.
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Solar Elevation and Azimuth Daily CalculatorCompute 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.
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Sunlight Hours Affected by a South-Side BuildingEstimate 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.
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Hot Car Temperature CalculatorEstimate how hot the inside of a parked car gets over time. Enter outside temperature and minutes to see the dangerous interior heat rise.
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Altitude to Air Pressure CalculatorCalculate local atmospheric pressure at any altitude from elevation, air temperature and sea-level pressure using the standard barometric formula.
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Air Pressure at Altitude CalculatorCalculate atmospheric pressure at any altitude using the barometric formula. Enter altitude and sea-level pressure to get hPa, kPa, and atm.
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Tree Benefits CalculatorEstimate the annual CO₂ sequestered by your trees. Enter the number of trees and CO₂ absorbed per tree to see total carbon captured per year.
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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.
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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.
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Dry Adiabatic Lapse Rate Temperature CalculatorCalculate how air temperature changes with altitude using the dry adiabatic lapse rate of 9.8 °C per 1000 m. Enter surface temperature and altitudes.
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Absolute Humidity CalculatorCalculate absolute humidity in g/m³ from temperature and relative humidity using the Magnus-based formula. Fast, free, and accurate.
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Temperature Conversion CalculatorConvert temperatures between Celsius, Fahrenheit and Kelvin instantly. Enter a value and unit to see all three scales with exact formulas.
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Celsius to Fahrenheit CalculatorConvert Celsius to Fahrenheit instantly. Enter any °C value and get the exact °F result using the standard °F = °C × 9/5 + 32 formula.
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