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Lake Ice Thickness and Frost Depth Calculator
Estimate snow-insulated lake ice growth, compare measured ice with Gold’s load relation, and explore soil frost depth. Always measure ice; no safety verdict is given.
Earthquake Early Warning: Seconds Before Shaking
Calculate P- and S-wave arrivals, warning seconds and the blind zone. Animate wavefronts, infer distance from S−P and explore a rough shaking estimate. Educational use only.
Rocket Landing Burn and Tower Catch Simulator
Calculate ignition height, propellant use, g-load and tower-arm catch forces. Animate a variable-mass vertical landing with editable booster-scale assumptions.
AI Data Center Power, Cooling and Water Calculator
Estimate AI rack power, grid draw, cooling duty and water use. Compare wet towers, air-cooled chillers and dry cooling with PUE, WUE and annual totals.
PC and AI Rig Power Supply Calculator | PSU Sizing
Size a PC or multi-GPU AI rig PSU from wattages, check ATX 3.1 transients, estimate wall power and yearly cost, and explore 12V-2x6 contact heating.
Roof Snow Load Calculator: How Heavy Is the Snow Now?
Estimate roof snow weight from current depth, snow condition and age, ice and retained water. Compare local drift loads with your building’s verified design and action values.
House Cool-Down and Warm-Up Time Calculator
Estimate how long a house stays warm without power, cold-house heating time, and heat-pump night-setback savings with a two-node air and building-mass model.
Home Backup Generator Sizing Calculator
Size a home generator for running loads, sequenced motor starts, voltage dip and site derating. Estimate part-load fuel use, monthly cost and a conditional solar–battery cost crossover.
Air Purifier CADR and Indoor PM2.5 Calculator
Size a purifier and estimate indoor PM2.5 with outdoor leakage, deposition and indoor sources. See the steady level, cleaning time and animated particle balance.
Wind Chill and Frostbite Time Calculator
Calculate wind chill and approximate exposed-skin frostbite bands. Explore how temperature and wind change winter cold risk with an animated chart.
Butterfly Effect Simulation: Weather Predictability
Explore the butterfly effect with two nearly identical Lorenz-63 trajectories. Animate their divergence and learn what the model reveals about weather predictability.
Earth Energy Balance and CO2 Warming Calculator
Explore Earth's radiation balance, CO2 forcing, ocean warming and ice-albedo hysteresis with three linked teaching models, animated transients and sourced checks.
Zambretti Weather Forecaster
Estimate a 12-hour weather outlook from pressure, its 3-hour trend, wind and season. Includes sea-level reduction and clearly stated accuracy limits.
Wet-Bulb Temperature, Heat Index and WBGT Calculator
Calculate wet-bulb temperature, dew point, NWS heat index and wind chill. Estimate WBGT from local wind and sunlight, with Japanese heat-risk bands.
Drone Flight Time Calculator
Estimate multicopter hover time from battery energy and rotor physics. Check thrust-to-weight ratio and payload limits for a chosen endurance target.
Two-Link Robot Arm Calculator: Inverse Kinematics & Torque
Solve forward and inverse kinematics for a planar two-link arm, compare elbow up/down, and calculate static joint torques from link masses and payload.
Short-Circuit Current Calculator
Estimate three-phase and single-phase fault current, motor backfeed and peak current using a simplified IEC 60909 impedance model. Compare duty with breaker capacity.
RLC Circuit Response Calculator
Calculate RC, RL, and series or parallel RLC step responses, Bode plots, resonance, Q, and damping. Animate the transient and inspect voltage and current.
Pipe Pressure Drop and Pump Sizing Calculator
Calculate pipe pressure drop, pump head, shaft power and NPSHa with Darcy–Weisbach. Compare system and pump curves using Colebrook or Swamee–Jain friction factors.
Robot Drive Motor Sizing Calculator
Size wheel and motor torque, speed, reduction ratio and battery energy for an uphill wheeled robot. Check traction and compare a candidate motor at its loaded operating point.
Truss Analysis Calculator
Analyze 2D pin-jointed trusses by the direct stiffness method. Calculate member forces, stresses, support reactions and joint displacements with force-coloured diagrams.
Gear Ratio and Involute Gear Calculator
Calculate gear-train ratio, speed and torque; inspect a rotating involute spur pair with profile shift and contact ratio, then compare road speed by gear.
Stair Calculator — Rise, Run, Stringer & Headroom
Calculate stair rise, going, pitch, stringer layout length and headroom from total rise and run. Compare riser counts with explicit IRC or DIN dimensional checks.
Wind Turbine Energy Yield Calculator
Estimate annual wind turbine energy and capacity factor using Weibull winds, hub-height shear, and a Cp model or measured power curve. Include availability and site losses.
