Pressure and Fluids
Core tools for pressure relationships, hydrostatic loading and internal flow screening.
- Pipe Flow Rate & VelocityCalculator
Solve volumetric flow rate, mean velocity or internal pipe diameter with metric and Imperial units.
Q = A x v - Pressure, Force and AreaCalculator
Calculate pressure, force or area with proper engineering unit conversions.
P = F / A - Hydrostatic PressureCalculator
Find hydrostatic pressure difference from density, depth and gravitational acceleration.
ΔP = ρgh - Reynolds NumberCalculator
Estimate the flow regime from density, velocity, characteristic size and viscosity.
Re = ρ x v x D / μ
Heat Transfer
Thermal tools for stored energy, conduction rate and material comparison.
- Heat EnergyCalculator
Solve for heat energy, mass, specific heat or temperature difference on an SI basis.
Q = m x c x ΔT - Heat ConductionCalculator
Compare conduction rate from conductivity, area, temperature difference and thickness.
Qdot = k x A x ΔT / L - Thermal ExpansionCalculator
Estimate a material's unconstrained length change from a temperature swing.
ΔL = L₀ x α x ΔT - Elastic ElongationCalculator
Estimate axial stress and linear-elastic elongation for a uniform member.
ΔL = F x L₀ / (A x E)
Dimensionless Numbers
Focused ratios for screening flow regime, diffusion and heat-transfer behavior before applying a correlation.
- Reynolds NumberCalculator
Compare inertial and viscous effects, with an internal-flow regime interpretation.
Re = ρ x v x L / μ - Prandtl NumberCalculator
Compare momentum and thermal diffusion from fluid properties or diffusivities.
Pr = μ x Cp / k - Biot NumberCalculator
Screen internal versus surface thermal resistance before a transient lumped-capacitance estimate.
Bi = h x Lc / ks - Fourier NumberCalculator
Calculate dimensionless time for a transient-conduction problem.
Fo = α x t / L² - Nusselt NumberCalculator
Solve Nusselt number or convection coefficient, with a scope-checked turbulent-pipe correlation mode.
Nu = h x L / k - Mach NumberCalculator
Calculate speed relative to the local speed of sound using a known value or an ideal-gas model.
M = V / a - Froude NumberCalculator
Screen shallow-water and open-channel flow as subcritical, critical or supercritical.
Fr = V / √(gD) - Grashof NumberCalculator
Compare buoyancy and viscous effects before selecting a natural-convection correlation.
Gr = gβΔTL³ / ν² - Rayleigh NumberCalculator
Combine buoyancy, viscous and thermal-diffusion effects for natural-convection screening.
Ra = Gr x Pr
Electricity
Circuit tools built around voltage, current and resistance.
- kW to AmpereCalculator
Convert power into approximate line current for three-phase, single-phase and DC systems.
I = P / (√3 x V x cos phi x eta) - Ampere to kWCalculator
Convert line current into approximate power for three-phase, single-phase and DC systems.
P = √3 x V x I x cos phi x eta - Ohm's LawCalculator
Calculate voltage, current or resistance for basic electrical circuit checks.
V = I x R