地球科学ツール

地質・地震・地球システムの計算機。

Free earth science calculators for students, educators, and anyone curious about our planet. Convert between earthquake magnitude scales, estimate seismic energy and TNT equivalents, and explore geology and environmental tools — all using standard seismological relationships. Every calculator runs instantly in your browser with clear steps and no signup.

Popular 地球科学ツール

Earthquake Magnitude ConverterConvert between earthquake magnitude scales — Mw, Ms, ML (Richter), mb, and Md. Estimates seismic moment, energy in joules, and TNT equivalent. Free, browser-based.
Richter Scale CalculatorCalculate Richter magnitude from seismograph amplitude and distance, explore effects and energy for any ML value, or compare two magnitudes. Free, browser-based.
Wind Chill CalculatorCalculate wind chill (feels-like temperature) from air temperature and wind speed. Uses the official NWS / Environment Canada 2001 formula with frostbite risk guidance. Free, browser-based.

地球科学ツール

Earthquake Magnitude Converter

Convert between earthquake magnitude scales — Mw, Ms, ML (Richter), mb, and Md. Estimates seismic moment, energy in joules, and TNT equivalent. Free, browser-based.

Used 1 timesUpdated 26 minutes ago

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地球科学ツール

Heat Index Calculator

Calculate heat index (feels-like temperature) from air temperature and relative humidity. Uses the official NWS Rothfusz formula with heat risk guidance. Free, browser-based.

Used 1 timesUpdated 17 minutes ago

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地球科学ツール

Dew Point Calculator

Calculate dew point from temperature and relative humidity, or find RH from temperature and dew point. Shows vapor pressure, absolute humidity, and comfort level. Free, browser-based.

Used 1 timesUpdated 21 minutes ago

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地球科学ツール

Humidity Calculator

Calculate relative humidity, dew point, wet-bulb temperature, vapor pressure, absolute humidity, and mixing ratio from dry-bulb readings. Free, browser-based.

Used 1 timesUpdated 2 minutes ago

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地球科学ツール

Carbon Footprint Calculator

Estimate your annual carbon footprint from car travel, flights, home electricity, and natural gas. Compare to global averages with regional grid factors. Free, browser-based.

Used 1 timesUpdated 2 minutes ago

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地球科学ツール

Climate Data Analyzer

Analyze temperature and precipitation climate data. Paste daily or monthly values to get mean, min, max, std dev, heating/cooling degree days, wet days, dry spells, and Northern Hemisphere seasonal summaries (DJF, MAM, JJA, SON). Free, browser-based.

Used 1 timesUpdated 19 minutes ago

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地球科学ツール

Richter Scale Calculator

Calculate Richter magnitude from seismograph amplitude and distance, explore effects and energy for any ML value, or compare two magnitudes. Free, browser-based.

Used 0 timesUpdated never

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地球科学ツール

Wind Chill Calculator

Calculate wind chill (feels-like temperature) from air temperature and wind speed. Uses the official NWS / Environment Canada 2001 formula with frostbite risk guidance. Free, browser-based.

Used 0 timesUpdated never

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地球科学ツール

Air Density Calculator

Calculate air density from temperature, pressure, and humidity, or from altitude. Shows kg/m³, virtual temperature, speed of sound, and comparison to sea-level standard. Free, browser-based.

Used 0 timesUpdated never

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地球科学ツール

Altitude Pressure Calculator

Convert between altitude and atmospheric pressure using the barometric formula or ISA standard atmosphere. Pressure in hPa, inHg, kPa, and more. Free, browser-based.

Used 0 timesUpdated never

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地球科学ツール

Soil Density Calculator

Calculate soil bulk density, moisture content, porosity, and void ratio from sample mass and volume. Supports metric (g, cm³) and imperial (lb, ft³). Free, browser-based.

Used 0 timesUpdated never

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地球科学ツール

Rock Density Calculator

Calculate rock bulk density from mass and volume, rectangular blocks, or drill cores. Porosity from grain density. Compare to typical granite, basalt, limestone, and more. Free, browser-based.

Used 0 timesUpdated never

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