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46 results in calculators.
Clear searchCalculator · Measurement & Control
Calculate mean, median, sample standard deviation and standard error from repeated readings in the same unit.
Calculator · Thermal
Calculate dimensionless transport groups and diffusivities from fluid properties, a speed and a characteristic length. Defaults are an illustrative property set, not a certified fluid state.
Calculator · Measurement & Control
Propagate two input standard uncertainties through addition, subtraction, multiplication or division. Standard uncertainty is expressed as a standard deviation; do not enter a tolerance bound or expanded uncertainty unchanged.
Calculator · Thermal
Pure water at liquid–vapor equilibrium, using absolute pressure in Pa. The range is 611.657 Pa through pressures strictly below 22064000 Pa. Quality is undefined at the critical point; numerically unresolved phase boundaries are rejected.
Calculator · Thermal
Pure water at liquid–vapor equilibrium, using absolute pressure in Pa. The range is 611.657 Pa through pressures strictly below 22064000 Pa. Quality is undefined at the critical point; numerically unresolved phase boundaries are rejected.
Calculator · Thermal
Pure water liquid–vapor equilibrium from the triple-point temperature 273.16 K to the critical point 647.096 K. Pressure is absolute, never gauge; temperature input uses kelvin.
Calculator · Thermal
Pure water liquid–vapor equilibrium from the triple-point temperature 273.16 K to the critical point 647.096 K. Pressure is absolute, never gauge; temperature input uses kelvin.
Calculator · Measurement & Control
EU means engineering unit. Use consistent input/output units; gain is output-unit change divided by input-unit change. This is a stable linear first-order-plus-dead-time process initially at equilibrium, with one sustained step at time zero.
Calculator · Measurement & Control
Model one DC series loop with a two-wire loop-powered transmitter, resistive receiver and total outgoing-plus-return cable resistance. Use the lowest available supply and worst-case device data for your selected current.
Calculator · Measurement & Control
EU means your chosen engineering unit: use the same unit for both endpoint values and the engineering input/output. No unit conversion is performed. Current is in mA, not A.
Calculator · Measurement & Control
EU means your chosen engineering unit: use the same unit for both endpoint values and the engineering input/output. No unit conversion is performed. Current is in mA, not A.
Calculator · Mechanics
Uniform homogeneous linear-elastic slender beam, constant EI, small deflection and principal-axis bending. Loads act in the bending plane without torsion. I is the area second moment about that axis, not polar or mass inertia; c is the farthest material fibre from the neutral axis.
Calculator · Mechanics
Concentric circular opening; zero inner diameter selects solid. A = π(Do² − Di²)/4; Ix = Iy = π(Do⁴ − Di⁴)/64. A circle has the same centroidal second moment about every in-plane diameter.
Calculator · Mechanics
Concentric rectangular opening with sharp corners. Set both inner dimensions to zero for solid. A = bh − bi hi; Ix = (b h³ − bi hi³)/12; Iy = (h b³ − hi bi³)/12. Wall thickness may differ horizontally and vertically.
Calculator · Fluid Mechanics
Stationary, one-dimensional normal shock; calorically perfect ideal gas, constant R and γ. Upstream Mach must exceed 1 for a shock; exactly 1 is the zero-strength limit. Inputs use the shock-fixed frame, absolute pressure and Kelvin.
Calculator · Fluid Mechanics
Calorically perfect ideal gas with constant specific gas constant R and γ > 1. Enter static absolute pressure and Kelvin temperature, not stagnation conditions. Defaults approximate dry air; no atmospheric or composition lookup is performed.
Calculator · Mechanics
Uniform circular shaft with concentric bore, homogeneous isotropic material, constant torque and linear elastic small-strain response. Enter diameters, not radii. Inner diameter zero selects a solid shaft.
Calculator · Electrical
Sinusoidal steady-state AC power for a passive single-phase load or a balanced three-phase load. Enter RMS values and displacement power factor from 0 to 1.
Calculator · Electrical
Sinusoidal steady-state series RLC circuit with ideal linear components and positive total series resistance. Enter RMS source voltage, frequency in Hz, inductance in henries and capacitance in farads.
Calculator · Hydraulics
Pure liquid water properties from temperature and absolute pressure, using IAPWS SR6-08(2011) and SR1-86(1992). Supported range: 0.01–110 °C, pressure at or above saturation and no greater than 0.3 MPa (300000 Pa).
Calculator · Hydraulics
Calculate pure-water density and viscosity from temperature and inlet pressure, then estimate straight horizontal pipe friction. Liquid-water range: 0.01–110 °C and saturation pressure through 300000 Pa absolute.
Calculator · Valves
For turbulent liquid flow with no attached fittings correction: ΔP = P1 − P2; FF = 0.96 − 0.28√(Pv/Pc); ΔPchoked = FL²(P1 − FF Pv). All pressures must be absolute and use the same units.
Calculator · Thermal
Steady one-dimensional radial heat flow, constant properties and bulk temperatures along the length; perfect layer contact, no internal heat generation. Actual diameters are required, not nominal pipe sizes.
Calculator · Mechanics
Analyze a solid rectangular beam under a downward point load plus a uniform full-span load. Choose simple supports with a central point load, or a left-fixed cantilever with a tip load.
Calculator · HVAC
Calculate humidity ratio, dew/frost point, enthalpy, specific volume and moist-air density from temperature, relative humidity and absolute pressure.
Calculator · HVAC
Uniformly heat or cool an ideal moist-air stream at constant pressure to a specified outlet temperature. If cooling reaches saturation, remove liquid water and return saturated outlet air. No bypass or added moisture is modeled.
Calculator · HVAC
Mix two ideal moist-air streams adiabatically at a common pressure, with no work, heat transfer, added water or condensation. Inputs are dry-air mass flows, not total moist-air mass flows or volume flows.
Calculator · HVAC
Calculate an ideal moist-air state from dry bulb, thermodynamic wet bulb and absolute pressure, using ASHRAE relationships adapted from MIT-licensed PsychroLib.
Calculator · Thermal
Model up to three solid layers between two fluids. Number layers from side 1 toward side 2; set unused layer thicknesses to zero and retain positive conductivity inputs.
Calculator · Pumps
Combine reservoir elevation and pressure differences with pipe and local losses at an entered flow rate.
Calculator · Acoustics
Convert positive intensity to level: L = 10 log₁₀(I/Iref).
Calculator · Acoustics
Ideal full-sphere spreading: I = P/(4πr²), then L = 10 log₁₀(I/Iref).
Calculator · Thermal
Calculate surface convection using Q̇ = hAΔT and q″ = hΔT.
Calculator · Thermal
Net thermal radiation: Q̇ = εσA(Ts⁴ − Tsur⁴). Absolute temperatures must be entered in kelvin.
Calculator · Thermal
Q = mcΔT; heat capacity C = mc. Negative Q represents heat removed.
Calculator · Thermal
ΔL = αL₀ΔT; final length = L₀ + ΔL. Cooling or a negative expansion coefficient can produce contraction.
Calculator · Gases
Ideal gas relation p = ρRT gives density ρ = p/(RT). Specific volume is 1/ρ.
Calculator · Mechanics
For a uniform bar under centered axial load, stress σ = F/A, strain ε = σ/E, and length change δ = εL.
Calculator · Electrical
For an ideal ohmic resistor, I = V/R and P = VI = V²/R.
Calculator · Thermal
For steady one-dimensional conduction, heat rate = kAΔT/L and wall resistance = L/(kA).
Calculator · Hydraulics
For a fluid at rest with constant density and gravity: Δp = ρgh.
Calculator · Hydraulics
Dynamic pressure q = ½ρv² is kinetic energy per unit volume.
Calculator · General & Utilities
Convert engineering units, including area, volume, pressure, flow and separate dynamic and kinematic viscosities.
Calculator · Hydraulics
Calculates pressure drop using the Darcy-Weisbach equation
Calculator · Pumps
Reservoir model: NPSHA = (surface absolute pressure − vapor pressure)/(density × g) + liquid elevation − suction losses; negligible reservoir velocity
Calculator · Hydraulics
Finds a minimum internal bore satisfying the supplied mean-velocity and straight-pipe pressure-gradient limits.