🌍 Earth & Environmental Science Calculators
Weather, geology, climate, energy and water quality. Browse 40 free earth & environmental science calculators, each with the formula, a worked example and an interactive chart.
Earthquake Energy CalculatorConvert earthquake magnitude to released energy.Earthquake Magnitude Comparison CalculatorCompare the amplitude and energy of two earthquakes.Earthquake Distance from S–P Time CalculatorEstimate distance to an earthquake from the S-P arrival gap.Radiometric Rock Age CalculatorEstimate rock age from the daughter-to-parent ratio.Rock Porosity CalculatorCompute porosity from bulk and grain density.Darcy's Law Groundwater Flow CalculatorFind groundwater discharge through an aquifer.Temperature at Altitude CalculatorEstimate air temperature at a given altitude.Atmospheric Pressure at Altitude CalculatorEstimate pressure at a given elevation.Boiling Point of Water at Altitude CalculatorEstimate water's boiling temperature at altitude.Wind Turbine Power CalculatorEstimate power from a wind turbine.Solar Panel Output CalculatorEstimate daily energy from a solar array.Solar Irradiance on a Tilted Surface CalculatorFind the effective sunlight on a tilted panel.Planetary Equilibrium Temperature CalculatorEstimate a planet's equilibrium temperature.CO₂ Radiative Forcing CalculatorEstimate climate forcing from a CO₂ concentration change.Car Carbon Footprint CalculatorEstimate yearly CO₂ from driving.Tree Carbon Storage CalculatorEstimate CO₂ stored by trees.Rainfall Runoff Volume CalculatorCompute runoff from rainfall over a catchment.Evapotranspiration (Hargreaves) CalculatorEstimate reference evapotranspiration.Water Hardness CalculatorConvert calcium and magnesium to total hardness.Dissolved Oxygen Saturation CalculatorEstimate oxygen saturation of fresh water at a temperature.Biochemical Oxygen Demand CalculatorCompute BOD from dissolved oxygen readings.Secchi Depth Light Extinction CalculatorEstimate light extinction from Secchi disk depth.Stream Discharge CalculatorEstimate river discharge from width, depth and speed.Manning Channel Velocity CalculatorCompute open channel flow with Manning's equation.Soil Moisture Content CalculatorCompute gravimetric moisture content of a soil sample.Soil Bulk Density CalculatorCompute bulk density and porosity of soil.Fertilizer Application CalculatorFind fertiliser needed to supply a nutrient rate.Compost Carbon:Nitrogen Ratio CalculatorBlend two materials to reach a target C:N ratio.Energy Unit Converter (Joules, kWh, BTU, kcal)Convert between common energy units.Pressure Unit ConverterConvert between pascals, bar, atm, psi and mmHg.Length Unit ConverterConvert between metres, feet, inches, miles and kilometres.Mass Unit ConverterConvert between kilograms, pounds, ounces and stones.Volume Unit ConverterConvert between litres, gallons, cups and cubic metres.Speed Unit ConverterConvert between m/s, km/h, mph and knots.Fuel Economy ConverterConvert between mpg, L/100 km and km/L.Time Duration ConverterConvert seconds into minutes, hours, days and years.Digital Storage ConverterConvert between bytes, KB, MB, GB and TB.Sea Level Rise from Ice Melt CalculatorEstimate sea-level rise from melted ice volume.Tsunami Wave Speed CalculatorFind the speed of a shallow-water wave such as a tsunami.Day Length (Daylight Hours) CalculatorEstimate hours of daylight from latitude and day of the year.
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🚀 Mechanics & Motion🔥 Thermodynamics & Fluids⚡ Electricity & Magnetism🌈 Waves, Sound & Optics🪐 Modern Physics & Astronomy⚗️ General Chemistry🧪 Solutions, Acids & Kinetics🧬 Genetics & Molecular Biology🌿 Ecology & Evolution🫀 Human Body & Health∑ Algebra & Calculus📐 Geometry & Trigonometry📊 Statistics & Probability