Engineering & Science calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Rotational Molding Cycle Time Calculator
Plastics manufacturing & hollow products: Calculate oven cook time, forced cooling duration, wall thickness scaling law, and Peak Internal Air Temperature (PIAT).
Rotor Dynamic Two-Plane Balancing Calculator
Solve cross-plane influence coefficients (α11, α12, α21, α22) and compute exact polar correction weights and angles for coupled dynamic rotor balancing.
ROV Syntactic Foam Buoyancy Calculator
Underwater robotics & subsea vehicles: Calculate syntactic foam displacement block volume, seawater density adjustments, submerged wet weight, and metacentric trim stability ($BG$).
ROV Umbilical Drag & Top Tension Calculator
Subsea Robotics & Deepwater Intervention: Compute hydrodynamic cross-flow drag, catenary profile, top winch hang-off tension, and horizontal drift for armored ROV umbilicals.
RTJ Flange Gasket Calculator - API 6A ASME B16.20 Ring
Size API Spec 6A and ASME B16.20 Ring Type Joint (RTJ) metallic gaskets, standard R designations, groove depths, pitch diameters, and Brinell hardness differentials.
Rupture Disc Sizing Calculator - API 520 Kr Flow Capacity
Calculate certified velocity head loss Kr, equivalent piping length, burst tolerance, maximum recommended operating pressure, and relieving flow capacity per ASME Section VIII Div 1 UG-127.
Safety Valve Gas Orifice Calculator - API 520 Sizing
Size pressure safety relief valve (PSV) effective orifice areas and select standard API 526 letter designations (D through T) for gas and vapor service.
Safety Valve Liquid Orifice Calculator - API 520 Sizing
Calculate liquid safety relief valve required orifice area per API Standard 520 Part I with viscosity correction factor Kv, overpressure Kp, and API 526 selection.
SAG Mill Power Draw Calculator - Morrell Sizing Energy
Calculate SAG/AG mill motor power draw (kW and HP), total volumetric charge filling (J), grinding ball load (Jb), and critical rotational speed per Morrell C-model.
Salamon-Munro Squat Pillar Strength Calculator
Deep Coal Geomechanics: Calculate pillar load-bearing capacity using the classic Salamon-Munro power formula and the Salamon-Wagner squat pillar confinement formulation.
Saline Aquifer CO2 Sequestration Calculator
Subsurface Reservoir Geomechanics: Estimate effective carbon dioxide storage capacity ($M_{CO2}$ in Megatonnes), pore pressure fracture gradients, and plume footprint radius.
Salisbury Screen Radar Absorber Calculator
Stealth engineering & electromagnetic absorption: Model resonant Salisbury screen quarter-wave spacers ($d = \lambda / 4$), return loss ($\text{RL}$ in dB), surface impedance matching, and $-10\text{ dB}$ absorption bandwidth.
Sand Casting Core Buoyancy Lift Calculator
Determine net upward buoyant forces on submerged sand cores, core print bearing stresses, and metallostatic vertical lifting force on the cope box.
SAR Azimuth Resolution Doppler Calculator
Synthetic Aperture Radar (SAR) & Earth Observation: Compute fine azimuth resolution ($\Delta x = L_a / 2$), Doppler bandwidth ($B_D$), synthetic aperture length, and dwell time.
Satellite Eclipse Battery DOD Calculator
Spacecraft power systems: Calculate orbital shadow eclipse duration ($t_{\text{ecl}}$), required lithium-ion battery capacity (Ah and Wh), Depth-of-Discharge (DOD), and mission lifetime cycle degradation.
Satellite Eclipse Heater Power Calculator
Spacecraft power budgets: Calculate lumped-mass thermal cooldown during orbital shadow eclipse, minimum transient temperature, and survival heater wattage.
Satellite Orbit Lifetime Decay Calculator
Astrodynamics & Space Debris: Calculate satellite ballistic coefficient ($B$), altitude loss per revolution ($\Delta r_{rev}$), and orbital lifetime until reentry.
Satellite Orbital Decay Calculator
Atmospheric Aerodynamics: Calculate thermospheric drag deceleration ($a_D$), altitude loss per orbit ($\Delta a_{rev}$), ballistic coefficient, and satellite re-entry lifetime.
Satellite Solar Albedo Earth IR Load Calculator
Spacecraft thermal environment: Quantify external heat fluxes—direct solar radiation ($S_0$), Earth planetary albedo ($q_{\text{alb}}$), Earth thermal infrared ($q_{\text{IR}}$), and passive equilibrium temperature ($T_{\text{eq}}$).
Savitsky Planing Hull Calculator - Trim Resistance Lift
Calculate planing boat hydrodynamic lift, equilibrium running trim angle, wetted length, friction and pressure drag, and required power via the Savitsky method.
SCARA Robot Inverse Kinematics Calculator
Industrial robotics & high-speed assembly: Compute closed-form inverse kinematics joint angles ($ heta_1, heta_2, d_3, heta_4$), reachability radius, and elbow configurations for 4-DOF SCARA manipulators.
Schottky Barrier Height & Diode Current Calculator
Metal-semiconductor junctions & power electronics: Model Schottky barrier height ($\Phi_{Bn}$), Richardson thermionic emission current, forward I-V curves, and knee voltage.
SCR DeNOx Ammonia Calculator - NOx Removal & NH3 Slip
Size anhydrous or aqueous ammonia reagent consumption, NH3/NOx molar stoichiometry, and monitor ammonium bisulfate (ABS) air preheater fouling boundaries.
SCR Touchdown Bending Stress Calculator
Offshore Subsea Engineering: Determine peak bending moments, boundary layer curvatures, and combined equivalent stresses in the Touchdown Zone (TDZ) of Steel Catenary Risers.
Screw Compressor Vi Calculator - Volume Ratio Power Sizing
Calculate internal built-in volume ratio (Vi), internal pressure, power loss penalty from under-compression or over-compression, and optimal variable slide valve setting.
Screw Conveyor Capacity & Motor Power Calculator
Determine CEMA volumetric conveying capacity, screw RPM, material friction horsepower ($HP_m$), and total drive motor power.
Screw Extruder Drag Flow Throughput Calculator
Model metering zone drag flow (Qd), die backpressure backflow (Qp), net volumetric throughput, and mass output per classical Tadmor extrusion theory.
Seatbelt Load Limiter & Chest Calculator
Restraint system biomechanics: Model seatbelt load-limiting torsion bar payout, sternum chest deflection (D_chest), Viscous Criterion (V*C), and thoracic injury risk.
Secondary Clarifier Sizing Calculator - Overflow Rate GPD
Size municipal and industrial wastewater secondary settling tanks: calculate Surface Overflow Rate (SOR), Solids Loading Rate (SLR), and weir loading per Ten States Standards.
Self-Phase Modulation Phase Shift Calculator
Nonlinear Fiber Optics: Calculate nonlinear parameter ($\gamma$), effective interaction length ($L_{eff}$), and accumulated nonlinear B-integral phase shift ($\Phi_{NL}$).
Semi-Submersible Heave Period Calculator
Offshore floating structure dynamics: Calculate column waterplane stiffness, pontoon hydrodynamic added mass, and natural heave period (T_nz).
Series Compensation SSR Resonance Calculator
Power System Dynamics: Determine transmission line compensation level ($k_{se}$), sub-synchronous natural resonance frequency ($f_{er}$), and torsional interaction risk.
Serrated Edge Radar Diffraction Calculator
Stealth shaping & edge treatment: Calculate edge sweep redirection, Keller Geometric Theory of Diffraction ($GTD$), sawtooth trailing edge phase cancellation, and threat-sector RCS attenuation.
Severe Riser Slugging Calculator - Boe Stability Criterion
Determine whether a subsea pipeline-riser system will experience severe cyclic hydrodynamic slugging using the Bøe stability criterion and choke valve pressure drop.
Shaft Alignment Calculator - Thermal Growth Shim Sizing
Calculate machine thermal expansion growth, target cold alignment offsets, and required front/rear foot shimming using reverse indicator and rim-face methods.
Shaft Orbit 1X 2X Vibration Calculator
Model orthogonal proximity probe orbits, 1X and 2X filtered elliptical axes, forward vs reverse precession direction, and bearing clearance boundary safety.
Shallow Foundation Bearing Capacity Calculator
Determine ultimate and allowable bearing capacity for strip, square, and rectangular shallow footings using the general Meyerhof formulation.
Sheet Pile Cantilever Embedment Calculator
Deep Excavations & Retaining Structures: Determine required penetration depth ($D$), maximum bending moment ($M_{max}$), and section modulus ($Z_{req}$) for cantilever sheet pile walls.
Shell and Tube Heat Exchanger Calculator - LMTD Duty
Calculate counterflow Log Mean Temperature Difference (LMTD), TEMA multipass F-correction factors, thermal duty, and required tube surface area.
Shell and Tube Heat Exchanger Calculator - LMTD Sizing
Calculate Log Mean Temperature Difference (LMTD), multipass F-correction factors, overall heat duty (Q), and required tube surface area per TEMA standards.
Ship Damage Stability Lost Buoyancy Calculator
Calculate ship damage equilibrium via the Lost Buoyancy method: parallel sinkage, longitudinal trim, transverse list, and damaged metacentric height ($GM_{dam}$).
Ship Froude Number & Resistance Calculator
Naval hydrodynamics: Calculate length & volumetric Froude numbers, ITTC-1957 friction line, wave-making drag, and effective propulsion power (P_E).
Ship Froude Resistance Calculator - ITTC Towing Tank Scale
Calculate Froude number, model test scaling ratios, ITTC 1978 friction coefficients, wave-making resistance, and full-scale effective propulsion power.
Ship Metacentric Height Calculator - IMO Intact Stability
Calculate ship transverse metacentric height (GM, BM, KM), free surface correction, natural roll period, and compliance with the IMO 2008 Intact Stability Code.
Ship Metacentric Height GM Calculator
Determine metacentric height ($GM = KB + BM - KG$), transverse metacentric radius ($BM = I_T / \nabla$), righting lever ($GZ$), and IMO intact stability compliance.
Ship Resistance & Powering Calculator
Calculate hull hydrodynamic resistance ($R_T$), ITTC-1957 skin friction, Holtrop-Mennen form factor, wave-making drag ($R_W$), and installed engine power ($MCR$).
Ship Resistance ITTC 1957 Calculator
Determine frictional resistance ($C_F$), wavemaking resistance coefficient ($C_R$), total hydrodynamic drag ($R_T$), and effective towrope horsepower ($EHP$) per ITTC-1957 standards.
Ship Roll Period & GMT Stability Calculator
Intact ship hydrostatics: Calculate transverse metacentric height (GM_T), roll natural period (T_roll), roll gyration radius (k_xx), and stiff vs tender behavior.