Engineering & Science calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
API 14E Erosional Velocity Calculator - Multiphase Pipe
Calculate two-phase fluid mixture density, empirical C-factor limits, erosional velocity Ve, and minimum required pipe diameter per API Recommended Practice 14E Section 2.5.
API 2000 Tank Venting Calculator - Inbreathing Outbreathing
Determine normal thermal inbreathing/outbreathing, liquid displacement, and emergency fire relief venting requirements (Nm³/h & SCFH) per API Standard 2000.
API 521 Fire Relief Calculator - Wetted Surface Heat Duty
Calculate vessel wetted surface area up to 25 ft above grade, total fire heat absorption Q, and required mass relief vapor rate per API 521 Section 4.4.13.
API 618 Rod Load Calculator - Compressor Pin Reversal
Calculate combined gas and inertia piston rod loads, tension and compression safety margins, and crosshead pin lubrication reversal degrees per API 618 standards.
API 650 Seismic Moment Calculator - Tank Overturning Sizing
Determine impulsive (Mi) and convective sloshing (Mc) overturning moments and verify self-anchorage stability per API Standard 650 Appendix E.
API 650 Tank Shell Thickness Calculator - 1-Foot Method
Determine minimum nominal shell plate thickness (td & tt) for each course of welded atmospheric storage tanks per API Standard 650 Section 5.6.
API 650 Wind Girder Calculator - Tank Shell Stiffener Ring
Determine required section modulus (Z) for top and intermediate wind girders and calculate maximum allowable unstiffened shell height (H1) per API 650 Section 5.9.
API 682 Seal Flush Calculator - Mechanical Seal Plan Flow
Calculate mechanical seal face frictional heat generation, minimum required flush flow rate (GPM), and temperature rise per API 682 / ISO 21049 standards.
API Gravity Correction Calculator - 60°F Standard & SG
Normalize observed hydrometer readings taken at field temperatures to standard 60°F reference conditions per ASTM / API petroleum measurement standards.
API Oil-Water Separator Calculator - Stokes Settling Area
Determine horizontal rectangular separator surface area, width-to-depth ratios, residence time, and Stokes rise velocity per API Publication 421 standards.
Archie Water Saturation Calculator
Petrophysics & well logging: Determine water saturation (S_w), hydrocarbon saturation (S_hc), formation factor (F), and bulk volume water (BVW) using Archie classic empirical law.
Arrhenius Reaction Rate Calculator - Activation Energy
Calculate temperature-dependent reaction rate constants (k), solve for activation energy (Ea) from experimental data, and determine kinetic temperature sensitivity.
ASCE 7 Velocity Pressure and Gust Factor Calculator
Building Wind Loads (ASCE 7-16 / 7-22): Compute velocity pressure ($q_z$), exposure velocity coefficient ($K_z$), and gust-effect factor ($G$ or $G_f$) for flexible structures.
ASHRAE 62.1 Outdoor Air Ventilation Calculator
Indoor Air Quality & Ventilation: Calculate Breathing Zone outdoor air ($V_{bz}$), zone intake airflow ($V_{oz}$), and primary outdoor air fraction ($Z_p$).
ASME B31.3 Pipe Wall Thickness Calculator
Process Piping Engineering: Determine internal design pressure thickness $t$, total required thickness $t_m$ with corrosion allowance, and select suitable pipe schedules per ASME B31.3 §304.1.2.
ASME Gasket Seating Stress Calculator - m and y Factor
Calculate effective gasket width b, hydrostatic end force H, seating bolt load Wm2, operating bolt load Wm1, and required bolt area Am per ASME Section VIII Div 1 App 2.
ASME Hydrostatic Test Pressure Calculator - UG-99 Vessel
Calculate shop hydrostatic proof test pressure per ASME Section VIII Div 1 UG-99(b), lowest stress ratio (LSR), pneumatic test pressure (UG-100), and test temperature limits.
ASME Nozzle Reinforcement Calculator - UG-37 Area Sizing
Calculate required nozzle opening area replacement, available excess area in shell and nozzle neck, weld areas, and reinforcement pad (rep-pad) dimensions per ASME Section VIII Div 1 UG-37.
ASME PCC-1 Flange Bolt Torque Calculator - Preload Sizing
Calculate bolt preload tension, assembly torque, tensile stress percentage, and resulting gasket seating compression stress per ASME PCC-1 Guidelines.
ASME Piping Branch Reinforcement Calculator
Process Piping Mechanics: Determine required reinforcement area $A_1$, available excess metal areas $A_2, A_3, A_4$, and reinforcing pad dimensions per ASME B31.3 §304.3.2.
ASME Vessel Head Thickness Calculator - UG-32 Formed Head
Calculate minimum required wall thickness, corroded MAWP, and knuckle stresses for 2:1 semi-ellipsoidal, torispherical F&D, and hemispherical heads per ASME Section VIII Div 1.
ASME Vessel Shell Thickness Calculator - UG-27 MAWP Sizing
Calculate circumferential hoop stress thickness, longitudinal stress thickness, corroded MAWP, and shop hydrostatic test pressure per ASME Section VIII Div 1.
Asphalt Dynamic Modulus Master Curve Calculator
Mechanistic-Empirical Pavement Design: Calculate asphalt concrete dynamic modulus ($|E^*|$), WLF temperature shift factors ($a_T$), and sigmoidal master curves.
Asphaltene Onset Pressure Calculator
Flow Assurance Engineering: Determine Upper & Lower Asphaltene Onset Pressure (AOP), de Boer colloidal stability index, and precipitation risk across reservoir depletion paths.
Athermal Optical Mount Expansion Calculator
Optomechanical athermalization: Compute required elastomeric bond thickness ($t_e$), differential radial strain ($\Delta r$), thermal pinching stress ($\sigma_r$), and transmitted wavefront error (OPD) across operational temperature swings.
Atmospheric Reentry Heating Calculator
Aerothermodynamics: Model spacecraft atmospheric entry using the Allen-Eggers equations, peak g-load, deceleration altitude, and Sutton-Graves stagnation heat flux.
Attitude Quaternion Euler Transformation Calculator
Aerospace Attitude Kinematics: Seamlessly convert between Euler angles (Yaw $\psi$, Pitch $\theta$, Roll $\phi$), unit quaternions ($\mathbf{q}$), and DCM.
Austenite Grain Growth Kinetics Calculator
Thermal Processing & Grain Boundary Mechanics: Predict grain coarsening as a function of austenitizing temperature ($T$), soaking time ($t$), and activation energy ($Q$).
AUV Munk Moment Fin Stability Calculator
Submarine Hydrodynamics: Determine the destabilizing Munk moment ($M_{munk}$) on streamlined AUV hulls and size stabilizing tail fins to ensure dynamic flight stability.
AUV Propulsion Power & Battery Range Calculator
Autonomous Marine Robotics: Model hotel payload loads, cubic hydrodynamic propulsion power, and battery discharge to find maximum survey range and optimal speed.
Auxiliary Mine Duct Leakage & Fan Calculator
Determine delivered face airflow ($Q_{face}$), air leakage rate through joints and tears, cumulative duct resistance ($R_{duct}$), and auxiliary fan pressure requirements.
Avalanche Photodiode Gain & Breakdown Calculator
Optoelectronics & LiDAR detection: Calculate APD internal multiplication gain ($M$), McIntyre excess noise factor ($F$), multiplied photocurrent, and optimum gain for optical receivers.
Axial Compressor Diffusion Calculator
Turbomachinery Aerodynamics: Compute rotor relative velocity triangles, Lieblein diffusion factor ($D$), and de Haller deceleration ratio ($W_2/W_1$).
Axial Pile Bearing Capacity API RP 2A Calculator
Calculate ultimate axial compression and tension capacities, unit skin friction (alpha and beta methods), and toe end bearing resistance per API RP 2A-WSD.
Axial Turbine Reaction & Loading Stage Calculator
Determine meanline velocity triangles, stage loading coefficient ($\psi$), flow coefficient ($\phi$), degree of reaction ($R$), and blade exit angles.
Baghouse Differential Pressure Calculator - Filter Drop
Determine tube sheet differential pressure drop (ΔP in inches w.g.), clean fabric vs dust cake resistance breakdown, and exhaust fan electrical energy costs.
Baghouse Dust Collector Calculator - Air to Cloth Ratio
Calculate pulse-jet baghouse filter cloth area, Air-to-Cloth (A/C) ratio, total bag count, interstitial can velocity, and cleaning air demand.
Baghouse Filter Area Calculator - Air to Cloth Ratio
Determine required total filter media area (sq ft), recommended Air-to-Cloth (A/C) ratio, filter bag count, and upward interstitial can velocity (FPM).
Bagley End Correction Viscometer Calculator
Capillary rheometry & polymer testing: Eliminate entrance and exit convergent flow pressure losses using the Bagley plot method, calculating the end correction factor ($e$), true wall shear stress ($\tau_w$), and Rabinowitsch-corrected viscosity.
Ball Formula Method Calculator - Thermal Process Food Time
Determine thermal process operating time (B) and operator process time (Pt) from heat penetration parameters (fh, jh) using the classic C.O. Ball formula method.
Ball Mill Critical Speed & Charge Calculator
Calculate tumbling ball mill critical rotational speed ($N_c$), operating percent critical, steel ball charge volume ($J$), and Bond motor power draw.
Ball Screw Thermal Growth Pretension Calculator
CNC Machine Tool Engineering: Calculate frictional heating, axial thermal growth ($\Delta L$), and required tensile pretension to eliminate thermal positioning error in precision ball screws.
Bare Reactor Geometric Buckling Calculator
Compute geometric buckling ($B_g^2$), material buckling ($B_m^2$), and minimum critical dimensions for bare spherical, cylindrical, and rectangular nuclear reactor cores.
Barton Q-System Rock Support Calculator
Geotechnical & tunneling mechanics: Calculate the NGI Q-index, equivalent dimension (De), maximum unsupported span, rock bolt spacing, and shotcrete lining.
Barton Q-System Rock Support Calculator
Underground rock engineering & tunneling: Determine the NGI Rock Mass Quality Index ($Q$), equivalent excavation dimension ($D_e$), maximum unsupported span, and permanent support category.
Barton-Bandis Rock Joint Shear Calculator
Rock mechanics & rock slope stability: Model non-linear shear strength, asperity override, dilation angle, and field scale corrections ($JRC_n, JCS_n$) per the Barton-Bandis criterion.
Basal Geotextile Embankment Calculator
Embankment Geotechnics & BS 8006: Calculate required design tensile strength ($T_{ds}$), ultimate strength ($T_{ult}$), and safety factors against circular slip and lateral sliding.
Bateman Decay Chain Calculator
Nuclear radiochemistry: Solve the Bateman equations for parent-daughter-granddaughter decay chains, secular/transient equilibrium, and peak ingrowth time.