Science & Weather Tools
Electricity, weather, psychrometrics (wet bulb / dew point / heat index), cooling towers, AQI, and a simple carbon footprint.
Ohm's Law Solver
Solve Ohm's law for voltage, current, or resistance using V = I * R.
Resistor Network Calculator (Series/Parallel)
Compute equivalent resistance for two resistors in series or parallel.
Voltage Drop Estimator
Estimate voltage drop using a simplified Vdrop = I * (R_per_unit * length) model.
Wind Chill Calculator
Estimate wind chill (F and C) from temperature and wind speed.
Heat Index Calculator
Estimate heat index from temperature and relative humidity.
Dew Point Calculator
Estimate dew point from temperature and relative humidity.
Wet Bulb / Dry Bulb & Psychrometrics
From temperature and humidity: wet bulb (Stull 2011), dew point (Magnus), and heat index in one view for HVAC, towers, and weather.
Cooling Tower Efficiency Calculator
Compute thermal range, approach to wet bulb, and tower effectiveness from hot water, cold water, and entering air wet-bulb temperature.
AQI Calculator (PM2.5, PM10, NO₂, O₃)
Estimate US AQI sub-indices from pollutant concentrations and overall AQI as the max; optional illustrative city presets.
Carbon Footprint Calculator
Estimate annual CO2e from car, flights, home electricity (grid presets), diet baseline, and monthly lifestyle extras, plus rough tree equivalents.
Energy Density Comparator
Compare gravimetric energy density (Wh/kg) for batteries, diesel, petrol, coal, natural gas, and hydrogen. Sliders for mass, optional efficiency override, Chart.js bars, CO₂ and cost hints, and home/EV equivalents.
Half-Life Decay Calculator
Compute remaining fraction after time t given half-life.
Molarity & Dilution Calculator
Moles per litre and dilution helper.
pH Calculator
pH from [H+] or buffer ratio with pKa.
Reaction Yield Calculator
Calculate percentage yield from actual product and theoretical yield.
Normality (N) from Molarity
Convert molarity (mol/L) to normality (eq/L) using the active n-factor.
Dilution Calculator (M₁V₁ = M₂V₂)
Solve missing concentration or volume in a dilution (ideal solution, same units).