Thermodynamics And Heat calculators
46 calculators Boyle's Law Calculator Solve Boyle's law P1V1 = P2V2 for any unknown pressure or volume. Pick from 10 pressure and 7 volume units, see the P-V curve, and find moles of gas.
Open Charles's Law Calculator Solve Charles's law V₁/T₁ = V₂/T₂ for any unknown at constant pressure. Switch temperature units (K, °C, °F) and volume units, and find moles with pressure.
Open Combined Gas Law Calculator Solve the combined gas law for any pressure, volume, or temperature. Switch units across atm, kPa, bar, mmHg, psi, L, m³, ft³, °C, °F, and K, with full worked steps.
Open Efficiency Calculator Solve for efficiency, output, or input. Switch energy or power units, compare to the Carnot limit, and cost the wasted energy. Steps and a gauge included.
Open Enthalpy Calculator Find enthalpy change ΔH four ways: measured heat, Hess formation enthalpies, sensible heat (mcΔT), or phase change (mL). Unit switches, per mole output, full steps.
Open Heat Transfer Calculator Find the rate of heat transfer by conduction, convection, or radiation, or the heat energy with Q = mcΔT. Unit switches, thermal resistance, and a cost estimate.
Open Ideal Gas Law Calculator (PV = nRT) Solve PV = nRT for pressure, volume, amount or temperature. Switch units (atm, kPa, bar, psi, L, m³, °C, K, °F), and get molecules, molar volume, mass and density.
Open Latent Heat Calculator Solve Q = m·L for heat, mass, or specific latent heat. Pick a substance preset for fusion, vaporization, or sublimation, switch mass units, and price the energy.
Open Specific Heat Calculator Solve Q = m·c·ΔT for heat, mass, specific heat, or temperature change. Pick a substance, switch units, use initial and final temperatures, and price the energy.
Open Thermal Conductivity Calculator Solve heat conduction with Fourier law: heat-transfer rate, flux, R-value, U-value and yearly energy cost. Pick a material or solve for k, thickness, area or ΔT.
Open Thermal Expansion Calculator Find linear, area, or volumetric thermal expansion, thermal stress, and the expansion gap to leave. Pick a material preset or your own coefficient, metric or imperial.
Open Biot Number Calculator Calculate the Biot number (Bi = hL/k) for any geometry. Reverse-solve for h, L, or k, select a shape, use the material library, and check lumped capacitance validity.
Open Boltzmann Factor Calculator Calculate the Boltzmann factor, population ratio, partition function, and state occupancy probability. Supports eV, J, kJ/mol, kcal/mol, and K/C/F inputs.
Open BTU to Tons of Refrigeration Converter Convert BTU/hr to tons of refrigeration, kilowatts, or watts instantly. Enter any unit and get all others with a worked example and HVAC sizing table.
Open Calorimetry Calculator Calculate heat transfer (Q = mcΔT) instantly. Solve for heat, mass, specific heat, or temperature change. Supports J, kJ, cal, g, kg, C, F, K with steps shown.
Open Carnot Efficiency Calculator Calculate Carnot efficiency from hot and cold reservoir temperatures. Supports reverse-solve, actual vs ideal comparison, COP for heat pumps, and power-loss breakdown.
Open Coefficient of Performance Calculator Calculate COP for refrigerators and heat pumps using heat values or Carnot temperatures. Shows Carnot limit, second-law efficiency, and both heating and cooling COP.
Open Compressibility Factor (Z) Calculator Calculate the compressibility factor Z for real gases using van der Waals, Peng-Robinson, or SRK equations of state. Supports 10 gases, SI and imperial units.
Open Curie's Law Calculator Calculate magnetic susceptibility, magnetization, temperature, or Curie constant with Curie's Law. Includes 8 paramagnetic ion presets and a live chi-vs-T chart.
Open Effectiveness-NTU Calculator Calculate heat exchanger effectiveness, NTU, heat capacity ratio, outlet temperatures and heat transfer rate. Covers 6 flow arrangements with step-by-step math.
Open Electrical Mobility Calculator Calculate electrical mobility, drift velocity, and diffusion constant via the Einstein-Smoluchowski relation. Covers electrons, holes, and ions with worked steps.
Open Evaporation Rate Calculator Calculate water evaporation rate by surface area, wind speed, temperature, and humidity. Get results in kg/h, L/h, gal/h, or daily totals with a full step-by-step breakdown.
Open Gay-Lussac's Law Calculator Solve Gay-Lussac's Law (P1/T1 = P2/T2) for any variable. Enter three values, pick pressure and temperature units, and get an instant step-by-step solution.
Open Heat Capacity Calculator Calculate heat energy, specific heat, mass, or temperature change using Q = mcDeltaT. Choose from 50+ material presets, switch units, and see the full worked solution.
Open Heat Transfer Coefficient Calculator Calculate convective heat transfer coefficient (h), overall U-value, heat flux, or total heat transfer Q. Six modes, step-by-step math, SI and imperial units.
Open Ideal Gas Density Calculator Calculate the density of any ideal gas from pressure, temperature, and molar mass. Choose from 15 gas presets or enter a custom mass. Metric and imperial units.
Open Isentropic Flow Calculator Calculate isentropic flow relations: Mach number, pressure, temperature, density and area ratios, Mach angle, and Prandtl-Meyer function for compressible gas flow.
Open Joule Heating Calculator Calculate Joule heating with Q = I^2Rt. Find power dissipated, heat energy in joules or kWh, and temperature rise for any conductor or resistor. Free and instant.
Open LMTD Calculator: Log Mean Temperature Difference Calculate LMTD for parallel flow, counter flow, and shell-and-tube heat exchangers. Includes LMTD correction factor F, R, P parameters, heat duty, and transfer area.
Open Mean Free Path Calculator: Gas Molecules, Vacuum Regimes, and Collisions Calculate mean free path from temperature, pressure, and kinetic diameter. Shows collision frequency, mean speed, and vacuum regime for 14 preset gases.
Open Mixed Air Calculator Calculate the mixed air temperature, relative humidity, humidity ratio, dew point, enthalpy, and mass flow for two blended HVAC air streams. Metric and imperial units.
Open Mixed Air Temperature Calculator HVAC mixed air temperature calculator. Enter stream temperatures and flow rates; get mixed temperature, outdoor-air fraction, and stream percentages in CFM or m3/s.
Open Newton's Law of Cooling Calculator Calculate temperature over time with Newton's Law of Cooling. Solve for final temp, cooling time, or derive k from heat transfer coefficient, area and specific heat.
Open Nusselt Number Calculator Calculate the Nusselt number from h, L and k, or use built-in correlations: Dittus-Boelter, Gnielinski, flat plate and Churchill-Chu natural convection.
Open Particles Velocity Calculator Calculate RMS speed, mean speed, and most probable speed of gas molecules from temperature and molar mass. Includes 14 preset gases with metric and imperial units.
Open Root Mean Square Velocity Calculator Calculate RMS speed of any gas molecule. Choose from 19 gas presets or a custom molar mass. Outputs mean speed, most probable speed, and kinetic energy per mole.
Open Sensible Heat Calculator Calculate sensible heat (Q = mcΔT) or size HVAC airflow loads. 15 material presets, metric/imperial, solve for Q, mass, or ΔT. Step-by-step workings.
Open Specific Gas Constant Calculator Calculate the specific gas constant (Rs) from molar mass or specific heats. Presets for 13 common gases, reverse-solve for molar mass, and a worked-example panel.
Open Thermal Diffusivity Calculator Calculate thermal diffusivity (alpha = k / rho·cp), penetration depth, thermal response time, and Fourier number. Includes 15 material presets and unit switches.
Open Thermal Efficiency Calculator Calculate thermal efficiency from heat input and work output, solve for any variable, find the Carnot limit, and compare second-law efficiency. J, kJ, BTU, cal.
Open Thermal Energy Calculator Calculate thermal energy (Q), mass, specific heat, or temperature change with Q = mcΔT. 30+ material presets, multiple unit options, and step-by-step working shown.
Open Thermal Equilibrium Calculator Calculate the final equilibrium temperature and heat transferred when two objects mix. Supports 18 substances, metric and imperial units, and reverse-solve modes.
Open Thermal Resistance Calculator Calculate thermal resistance for plates, cylinders, and spheres. Conduction, convection, series and parallel networks with 14 material presets and instant heat flow.
Open Van der Waals Equation Calculator Calculate pressure, volume, temperature, or moles for any real gas using the van der Waals equation. Choose from 12 gas presets or enter custom a and b constants.
Open Water Heating Calculator Calculate time, energy, power, and electricity cost to heat any volume of water. Handles phase changes (ice to steam) with metric or imperial units.
Open Watts to Heat Calculator Convert watts to heat energy (joules, BTU, kWh, kcal) and find temperature rise in any material. Includes 15 substances, unit switches, and reverse power-from-heat mode.
Open
No calculators match your filter.