Engineering & Science calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Hydrocracker Hydrogen Consumption Calculator
Calculate chemical hydrogen consumption (\(Nm^3/m^3\), \(SCF/bbl\)), reactor bed temperature rise (\(\Delta T\)), quench gas rates, and product slate yields.
Hydrocyclone Cut Point Calculator - D50 Separation Sizing
Calculate d50 cut point particle diameter, volumetric slurry feed capacity, pressure drop, and classification efficiency using Bradley and Rietema cyclone models.
Hydrocyclone Cut Size Calculator - Plitt Tromp Sizing
Calculate mineral processing hydrocyclone corrected cut size (d50c), operating slurry throughput, apex/vortex split ratio, and Tromp partition curve per Plitt.
Hydrocyclone Cut Size d50 Calculator
Calculate hydrocyclone classification cut size ($d_{50c}$), operating pressure drop ($\Delta P$), water split to underflow, and capacity via the Plitt model.
Hydrocyclone Cut Size d50 Calculator - Rietema Sizing
Calculate solid-liquid hydrocyclone separation cut point (d50), operating pressure drop, underflow-to-overflow split ratio, and classification sharpness.
Hydroponics EC to PPM Converter & Calculator
Convert electrical conductivity across 500 and 700 scales and dilution rates.
Hyperbaric Chamber Oxygen Toxicity Calculator
Hyperbaric medicine & technical diving: Calculate oxygen partial pressure ($PO_2$), cumulative Pulmonary Toxicity Dose ($UPTD / OTU$), Central Nervous System ($CNS\%$) toxicity clock, and safe exposure limits.
Hypersonic Stagnation Point Heat Transfer Calculator
Model convective aerodynamic heat flux (W/cm²), radiative equilibrium surface temperature, and Thermal Protection System (TPS) limits using the Fay-Riddell formulation.
Impeller Pumping Rate Calculator - Flow Number Turnover
Calculate primary impeller volumetric pumping discharge (GPM and m³/hr), flow number (Nq), tank liquid turnover time, and bulk circulation velocity.
Induced Gas Flotation Calculator - IGF Retention Time
Size horizontal multi-cell mechanical induced gas flotation (IGF) units, verify 4-chamber series residence time (3–5 min), and calculate oil removal efficiency.
Inertial Microfluidic Focusing Calculator
Label-Free Microfluidic Cell Sorting: Determine channel Reynolds number ($Re_c$), particle Reynolds number ($Re_p$), net inertial lift ($F_L$), and minimum focusing length ($L_f$).
Inertial Microfluidics Dean Flow Calculator
High-throughput cell sorting: Model secondary Dean vortices ($De$), inertial shear and wall lift forces ($F_L$), Dean drag ($F_D$), and equilibrium focusing position in spiral channels.
Infinite Slope Stability Seepage Calculator
Geotechnical engineering & hillslope hydrology: Evaluate Factor of Safety ($FS$) against shallow planar translational landslides with steady seepage parallel to the slope face.
Infusion Pump Peristaltic Flow Calculator
Medical device mechanics & infusion technology: Calculate rotary peristaltic IV pump delivery rate, roller stroke volume ($V_{\text{stroke}}$), motor RPM, and drug dosing bolus volume.
Injection Molding Clamping Force Calculator
Determine machine press clamping tonnage (US tons and metric tonnes), total projected parting line area, cavity pressure, and flash prevention margins.
Injection Molding Clamping Tonnage Calculator
Determine total projected area ($A_{proj}$), average cavity packing pressure, required clamping force ($F_{clamp}$), and machine tonnage sizing.
Injection Molding Cooling Time Calculator
Calculate minimum part cooling time, overall molding cycle duration, and hourly parts production as a function of wall thickness and resin thermal properties.
Injection Molding Part Cooling Time Calculator
Determine mandatory part cooling time ($t_c$), polymer thermal diffusivity ($\alpha$), centerline freeze time, and total injection molding cycle time.
Injection Molding Runner Pressure Drop Calculator
Model non-Newtonian polymer pressure drop through cold runner channels, wall shear rate, fill time, and viscous frictional dissipation per Moldflow standards.
Insulator Creepage Distance ESDD Calculator
Transmission line & substation insulation: Calculate required creepage distance per IEC 60815, Site Pollution Severity (SPS), Equivalent Salt Deposit Density (ESDD), and shed profiles.
Interposer Thermal Warpage Calculator
Advanced 2.5D Multi-Die Packaging: Predict thermal bending curvature ($\kappa$), peak out-of-plane warpage ($\delta$), and shadow moiré coplanarity per JEDEC J-STD-020.
Intumescent Coating Thickness Calculator
Passive Fire Protection (PFP): Compute dry film thickness (DFT), wet film thickness (WFT), and volume consumption for R30 through R120 steel fire ratings.
Ion Exchange Softening Resin Bed Capacity Calculator
Determine required Strong Acid Cation (SAC) resin volume, hardness throughput volume ($m^3$ or gal), and NaCl brine regeneration stoichiometry.
Ion Implantation LSS Range & Straggle Calculator
Semiconductor microfabrication & doping: Compute projected range ($R_p$), longitudinal straggle ($\Delta R_p$), lateral straggle ($\Delta R_\perp$), peak concentration ($N_{peak}$), and p-n junction depth ($x_j$).
Ion Thruster Child-Langmuir Calculator
Electric spacecraft propulsion: Determine ion beam exhaust velocity ($v_e$), specific impulse ($I_{sp}$), Child-Langmuir space-charge limited current density ($j$), and thruster efficiency.
ISO 14644 Cleanroom Class Limit Calculator
Cleanroom & contamination control engineering: Calculate maximum airborne particulate concentration limits ($C_n$) per ISO 14644-1:2015, minimum grid sampling points ($N_L$), and design Air Changes per Hour (ACH).
ISO 1940 Rotor Permissible Unbalance Calculator
Rotordynamics & industrial machinery balancing: Calculate permissible residual unbalance ($U_{per}$), specific eccentricity ($e_{per}$), and two-plane dynamic tolerance allocation per ISO 1940-1 / ANSI S2.19.
ISO 834 Standard Fire Curve Calculator
Fire Dynamics & EN 1991-1-2: Evaluate nominal gas furnace temperatures and transient lumped-mass steel temperatures under standard ISO 834 cellulosic and hydrocarbon curves.
J2 Orbit Precession & SSO Calculator
Astrodynamics & Earth observation: Compute Right Ascension of the Ascending Node (RAAN) precession rate, apsidal drift, and exact Sun-Synchronous Orbit inclination from Earth’s $J_2$ gravitational potential.
Jacketed Reactor Cooling Calculator - Heat Removal Area
Calculate batch reactor reaction heat generation (Qgen), jacket heat removal capacity (Qrem), required wetted surface area, and coolant flow rate.
Jaumann Multilayer Radar Absorber Calculator
Broadband stealth engineering: Model multi-layer Jaumann radar absorbers, stepped surface resistance profiles ($R_1 > R_2 > R_3$), transmission matrix cascading, and octave bandwidth expansion.
Jaw Crusher Capacity & Reduction Calculator
Determine primary jaw crusher throughput ($Q$), reduction ratio ($RR$), chamber nip angle ($\alpha$), and connected electric motor power.
Jaw Crusher Capacity Calculator - Reduction Ratio & TPH
Calculate crushing reduction ratios (F80 to P80), Closed Side Setting (CSS), hourly throughput capacity (TPH), and Bond Work Index power.
Jaw Crusher Reduction Ratio Calculator - Feed CSS Sizing
Calculate primary jaw crusher reduction ratio, product 80% passing size (P80), allowable nip angle, and Gaudin-Schuhmann distribution modulus.
Jaynes-Cummings Vacuum Rabi Calculator
Quantum optics & cavity QED: Calculate resonant vacuum Rabi splitting ($2g$), upper and lower polariton eigenenergies, strong coupling regime criterion ($g > (\kappa + \gamma)/4$), and single-atom cooperativity ($C_1$).
Jeffcott Rotor Critical Speed Resonance Calculator
Rotordynamics & flexible shaft vibration: Model a Jeffcott rotor with unbalance eccentricity ($e_u$), calculating critical speed ($N_{cr}$), amplification factor ($Q$), dynamic response amplitude ($r$), and phase lag ($\phi$).
Jenike Hopper Mass Flow Half Angle Calculator
Determine critical hopper wall half-angle ($\theta_c$) for guaranteed mass flow discharge using Dr. Andrew Jenike bulk solids powder flowability theory.
JMAK Phase Transformation Kinetics Calculator
Solid-State Phase Kinetics: Model isothermal transformation curves, evaluate Avrami exponents ($n$), rate constants ($k$), and half-times ($t_{0.5}$).
Josephson Critical Current Calculator
Superconducting quantum physics: Calculate tunnel junction critical current ($I_c$) via the Ambegaokar-Baratoff relation, Josephson coupling energy ($E_J$), plasma frequency ($\omega_p$), and Stewart-McCumber damping parameter ($\beta_c$).
Joule-Thomson Cryogenic Cooling Calculator
Cryogenics & thermodynamics: Calculate Joule-Thomson isenthalpic expansion cooling ($\Delta T$), the J-T coefficient ($\mu_{JT}$), inversion temperature ($T_{inv}$), and Linde-Hampson liquefaction fraction.
Joule-Thomson Inversion Curve Calculator
Cryogenic Gas Liquefaction: Calculate the Joule-Thomson expansion coefficient ($\mu_{JT}$), inversion temperature curve ($T_{inv}$ vs $P$), and isenthalpic pressure drop cooling/heating.
Journal Bearing Oil Flow Calculator - Temperature Rise DT
Determine hydrodynamic lubricant side-leakage flow (Qs), oil supply demand, and adiabatic fluid-film temperature rise (ΔT) per Raimondi-Boyd.
Journal Bearing Power Loss Calculator - Petroff Friction
Estimate viscous shear torque, mechanical friction power loss (kW / HP), and coefficient of friction in hydrodynamic sleeve bearings.
Kalker Wheel-Rail Creep Force Calculator
Rail Vehicle Contact Mechanics: Calculate longitudinal (F_x), lateral (F_y), and spin creep moment (M_z) in the wheel-rail Hertzian contact patch using Kalker's linear theory.
Kalman Filter State Estimation Calculator
Optimal Estimation & GNC: Calculate state time propagation, measurement correction, Kalman Gain ($K$), and a posteriori error covariance ($P$).
Kaplan Turbine Blade & Guide Vane Cam Calculator
Optimize 3D cam relationship between wicket gate opening (α) and runner blade tilt (β), runaway speed multiplier, and axial hydraulic load.
Kaplan Turbine Calculator - Blade Tilt Discharge Sizing
Calculate Kaplan axial-flow turbine runner diameter, blade tilt angle, guide vane opening, axial hydraulic thrust, and MW power output per IEC 60193.
Kelvin-Helmholtz Shear Layer Growth Calculator
Free shear flows & atmospheric dynamics: Compute the gradient Richardson number ($Ri_g$), Miles-Howard stability margin, Kelvin-Helmholtz rollup wavelength ($\lambda_{KH}$), and spatial shear layer spreading rate ($d\delta/dx$).