Engineering & Science calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Food Water Activity BET GAB Isotherm Calculator
Determine equilibrium moisture content, water activity ($a_w$), BET and GAB monolayer moisture capacity, and critical microbial stability thresholds.
Forchheimer Non-Darcy Flow Gradient Calculator
Petroleum reservoir engineering & high-rate gas wells: Compute the non-Darcy coefficient ($\beta$), viscous vs inertial pressure gradients, Forchheimer number ($Fo$), and critical Darcy velocity limit ($v_c$).
Forklift Capacity Calculator - Load Center & Derate Chart
Determine safe derated lifting capacity when handling oversized pallets, long stock, or front-end attachments beyond standard 24-inch centers.
Formwork Pressure Calculator - ACI 347 Lateral Pour Rate
Calculate maximum lateral formwork pressure (psf) using ACI 347-14 standards based on vertical pour rate, mix temperature, and wall height.
Foundation Dynamic Soil Impedance Calculator
Structural dynamics & earthquake engineering: Calculate Gazetas dynamic foundation impedance functions—static stiffness ($K$), dynamic stiffness modifier ($k(\omega)$), and radiation damping ($C$)—for surface footings.
Four-Factor Formula k-Infinity Calculator
Determine the infinite multiplication factor ($k_\infty = \epsilon \cdot p \cdot f \cdot \eta$) and effective multiplication ($k_{eff}$) across fuel enrichment and moderator regimes.
Four-Point Probe Sheet Resistance Calculator
Semiconductor wafer metrology & doping characterization: Compute sheet resistance ($R_s$), bulk resistivity ($ ho$), and active carrier concentration from four-point probe ($V/I$) measurements.
Four-Wave Mixing WDM Penalty Calculator
Nonlinear Optical Networking: Calculate Four-Wave Mixing (FWM) phase mismatch ($\Delta\beta$), generation efficiency ($\eta$), and crosstalk power ($P_{FWM}$).
Four-Wave Mixing WDM Phase Matching Calculator
Nonlinear fiber optics & DWDM telecommunications: Model Four-Wave Mixing (FWM) intermodulation sidebands, phase-matching efficiency ($\eta$), nonlinear crosstalk, and generated idler power.
Frac Tank Volume Calculator - BBL Gauge & Fluid Height
Convert manual gauge dipstick measurements into barrels, gallons, and total fluid payload tonnage for 500 BBL standard and V-bottom frac tanks.
Fracture Fluid Viscosity Calculator - Crosslinked Gel n
Model shear-thinning non-Newtonian behavior of linear guar, crosslinked borate gels, and viscoelastic surfactants using the Ostwald-de Waele power-law equation.
Francis Turbine Calculator - Specific Speed Sigma Sizing
Calculate Francis turbine specific speed, runner inlet diameter, critical Thoma cavitation sigma, and maximum allowable setting height above tailwater per USBR.
Francis Turbine Specific Speed & Cavitation Calculator
Determine kinematic specific speed (nq), Thoma cavitation parameter (σ_c), and draft tube setting height to prevent runner blade pitting.
Free Aquarium CO2 Calculator
Determine dissolved carbon dioxide (PPM / mg/L) from pH and Carbonate Hardness (KH) to optimize aquatic plant growth and prevent fish asphyxiation.
Free Brick and Mortar Calculator
Estimate total bricks, cubic feet of mortar, and premixed 80lb mortar bags needed for retaining walls, garden planters, and masonry facades.
Free CO2 Tank Weight & Runtime Calculator
Determine remaining liquid CO2 by scale weight, convert to gas volume (SCF & Liters), and calculate remaining hours or months of runtime.
Free Concrete Slab & Bag Yardage Calculator
Calculate cubic yards and exact 80lb/60lb premix bags with waste buffer.
Free Daily Light Integral (DLI) Calculator
Convert Photosynthetic Photon Flux Density (PPFD) and photoperiod hours into Daily Light Integral (DLI in mol/m²/day) to hit exact crop growth targets.
Free Epoxy Resin Ratio & Volume Calculator
Calculate Part A and Part B mix weights, volume, and exotherm cure limits.
Free Epoxy River Table Calculator
Calculate exact epoxy resin volume, Part A & Part B weights, wood absorption buffer, and maximum safe single pour depths.
Free Greenhouse Heater Calculator
Determine heating requirements in BTU/hr and Kilowatts to keep seedlings alive through freezing winter nights based on glazing thermal U-values.
Free Microgreens Seed Density Calculator
Calculate precise seeding weights in grams, blackout days, light cycle duration, and expected harvest yield for standard 1020 and 1010 trays.
Free Surface Effect Virtual GM Loss Calculator
Determine virtual rise in center of gravity ($GG_1$), second moment of liquid surface area ($i_T$), and longitudinal bulkhead subdivision benefits for slack tanks.
Free Woodworking Board Foot Calculator
Calculate exact board feet (BF) volume, account for rough milling scrap waste, and estimate total hardwood lumber project cost.
Free-Space Optical Link Budget Calculator
Satellite & Free-Space Optical (FSO) Communications: Compute diffraction-limited telescope gains, free-space path loss, received optical power ($P_r$), and link margin.
Freeze Drying Primary Sublimation Calculator
Pharmaceutical Lyophilization: Model vial heat transfer coefficient ($K_v$), ice sublimation rate, drying duration, and critical collapse temperature ($T_c$) safety margin.
Fresnel Reflection & Transmittance Calculator
Interface wave optics: Calculate s-polarized and p-polarized Fresnel reflection coefficients (\(R_s, R_p\)), Brewster angle (\(\theta_B\)), and critical angle (\(\theta_c\)).
Froth Flotation Recovery & Grade Calculator
Calculate mineral recovery ($R$), mass yield ($Y$), enrichment ratio ($ER$), Gaudin separation efficiency ($SE$), and flotation kinetic rate constants.
Fuel Cell Hydrogen Consumption Calculator
Fuel cell systems engineering: Calculate electrochemical hydrogen and oxygen consumption rates via Faraday's Law, excess stoichiometric flow ($lambda$), and mission storage requirements.
Furnace Radiative Heat Transfer Calculator
Industrial furnace thermal rating: Calculate gas emissivity (\(\epsilon_g\)), radiant exchange factor, tube heat flux, and Lobo-Evans radiant absorbed heat duty.
Fusion Plasma Lawson Triple Product Calculator
Thermonuclear Fusion Power: Compute the Lawson triple product ($n_e T_i \tau_E$), empirical confinement scaling (IPB98(y,2)), fusion gain ($Q = P_{fus}/P_{aux}$), and ignition threshold.
Gait Joint Moment Inverse Dynamics Calculator
Human motion analysis & clinical gait mechanics: Compute sagittal plane ankle and knee joint moments ($M_{\text{joint}}$) and Achilles tendon tension from force plate ground reaction forces ($GRF$).
Galvanic Cathodic Protection Sizing Calculator
Offshore & Marine Corrosion Engineering: Size sacrificial anode mass ($M$), quantity, circuit resistance ($R_a$), and current output per DNV-RP-F103.
Gamma Radiation Shielding Attenuation Calculator
Compute broad-beam gamma-ray attenuation ($I = I_0 \cdot B \cdot e^{-\mu x}$), linear attenuation coefficients, Half-Value Layers (HVL), and required shield thickness.
Gamma Radiation Shielding Calculator
Radiation protection physics: Calculate narrow-beam and broad-beam gamma attenuation, Half-Value Layers (HVL), Tenth-Value Layers (TVL), and Taylor buildup factors.
Gas Dispersion Impeller Flooding Calculator - Nienow Flg
Determine gas-liquid dispersion hydrodynamic regimes (flooded, loaded, complete dispersion) and gassed power draw (Pg/P0) per Nienow & Smith.
Gas Generator Turbopump Power Calculator
Liquid rocket propulsion cycles: Calculate fuel and oxidizer pump hydraulic and shaft powers, required gas generator turbine drive flow, and cycle specific impulse penalty.
Gas Hydrate Equilibrium Temperature Calculator
Subsea Flow Assurance: Calculate hydrate dissociation temperature ($T_{hyd}$), chemical inhibition suppression ($\Delta T_{dep}$), and subcooling risk margins.
Gas Hydrate Formation Calculator - Hammerschmidt Sizing
Calculate natural gas hydrate equilibrium formation temperature, required temperature depression, and thermodynamic inhibitor injection rates (Methanol, MEG, DEG) per GPSA.
Gas Kick Migration Rate Calculator - Shut-In Bubble Rise
Model bubble slip velocity (ft/hr), surface pressure buildup rate (ΔP/Δt), and compute volumetric method lubrication bleed schedules.
Gas Lift GLR & Inflow Performance Nodal Calculator
Optimize gas injection rate, Gas-Liquid Ratio ($GLR$), flowing bottomhole pressure ($P_{wf}$), and identify the critical inflection point on the gas lift performance curve.
Gas Lift Injection Rate Calculator - GLR Optimum Sizing
Determine the economic optimum lift gas injection rate (MMscfd / Sm³/d) by identifying the peak of the Gas-Liquid Ratio (GLR) performance curve.
Gas Lift Mandrel Spacing & Valve Sizing Calculator
Determine side pocket mandrel installation depths, surface unloading valve closing pressures ($P_{vc}$), and point-of-injection design.
Gas Pipeline Capacity Calculator - Weymouth MMCFD Flow
Size high-pressure transmission lines and determine gas flow rate in MMCFD and SCFH using the industry-standard Weymouth hydraulic equation.
Gas Reservoir p/z Material Balance Calculator
Determine Original Gas In Place ($G$ / OGIP), gas compressibility factor ($Z$), ultimate recovery factor, and remaining reserves at abandonment pressure.
Gas Turbine Brayton Cycle Calculator
Aerothermodynamics: Calculate open Brayton cycle specific net work ($w_{net}$), thermal efficiency ($\eta_{th}$), back work ratio ($BWR$), and optimal pressure ratio ($r_p$).
Gas Turbine Exhaust Energy Calculator - Heat Recovery HRSG
Calculate exhaust gas mass flow rate (lb/hr), available sensible waste thermal energy (MMBTU/hr & MWth), and steam generation capacity for cogeneration and HRSG boilers.
Gas Turbine Fouling Calculator - Compressor Derate Sizing
Quantify axial compressor aerodynamic fouling losses, inlet mass flow reduction, heat rate degradation, and financial megawatt loss per ISO 3977.