Physics and Engineering

  • Voltage Drop Percentage Calculator
    Calculate voltage drop percentage (VD%) from source voltage and voltage drop. Check if your circuit meets the common 3% / 5% limits instantly.
  • Torque from Moment of Inertia Calculator
    Calculate the torque required to rotate an object using τ = I·α. Enter the moment of inertia and angular acceleration to get torque in N·m instantly.
  • Watts to kWh Calculator
    Convert watts and run time to kilowatt-hours (kWh). Enter device power and hours used to find energy consumption for billing or efficiency checks.
  • Residential Electrical Load Calculator (NEC)
    Estimate a US home's total electrical load (VA) and service size in amps using NEC general-lighting, small-appliance, and fixed-appliance loads.
  • Annual Appliance Running Cost Calculator
    Calculate the yearly electricity cost of any appliance from its wattage, daily usage hours, and your price per kWh. Get annual, monthly, and daily costs.
  • VinFast VF7 Charging Cost Calculator
    Estimate the electricity cost to charge your VinFast VF7. Enter battery size, start and target charge, charging efficiency, and your power price.
  • VinFast VF8 Charging Cost Calculator
    Estimate the cost to charge your VinFast VF8 EV from any start to target charge level, factoring in electricity price and charging efficiency.
  • VinFast VF9 Charging Time Calculator
    Estimate how long it takes to charge a VinFast VF9 EV from any start to target percent using your charger power, battery size, and efficiency.
  • VinFast VF6 Charging Cost Calculator
    Estimate the cost to charge your VinFast VF6 EV. Enter battery size, electricity price, start and target charge, and efficiency to get the dollar cost.
  • Watts to BTU/hr Calculator
    Convert watts (W) to BTU per hour instantly. Enter power in watts to get BTU/hr using the factor 1 W = 3.412142 BTU/hr. Free and accurate.
  • Pipe Flow Rate from Diameter & Velocity Calculator
    Calculate volumetric water flow rate (Q) in a pipe from inner diameter and velocity. Get results in m³/s, L/s, and m³/h instantly.
  • GPM to LPM Flow Rate Converter
    Convert flow rate from gallons per minute (GPM) to liters per minute (LPM) instantly. Also shows liters per hour and cubic meters per hour.
  • Pipe Cross-Sectional Area Calculator
    Calculate the internal cross-sectional area of a pipe from its inside diameter using A = πD²/4. Supports mm, cm, inches and meters.
  • Flow Rate Calculator (Volume ÷ Time)
    Calculate volumetric flow rate from volume and time with Q = V/t. Convert results to L/s, L/min, m³/h and GPM instantly. Free online flow rate calculator.
  • Gallons Per Hour (GPH) Calculator
    Calculate gallons per hour (GPH) flow rate from a volume in gallons and elapsed time in hours. Free, instant GPH and GPM results.
  • Electricity Savings Calculator
    Calculate how much money and energy you save by switching to lower-wattage appliances or bulbs. Estimate daily, monthly and annual electricity savings.
  • BTU/hr to Watts Calculator
    Convert BTU/hr to watts instantly. Enter power in BTU per hour and get the equivalent in watts and kilowatts using W = BTU/hr ÷ 3.412.
  • kWh to kW Calculator
    Convert energy in kilowatt-hours (kWh) to power in kilowatts (kW) by dividing energy by time in hours. Fast, accurate kWh to kW conversion.
  • Running Amps and Startup Load Calculator
    Size a generator by adding running watts plus the largest startup surge. Enter your appliances to find the minimum wattage and a recommended size.
  • Cost to Run a Device per Hour Calculator
    Calculate the electricity cost to run any device per hour from its wattage and your kWh rate. Also shows daily, monthly and yearly running costs.
  • Solar Battery Bank Size Calculator
    Calculate the battery bank size in amp-hours (Ah) for your solar/off-grid system from daily energy use, days of autonomy, voltage and depth of discharge.
  • Wire Gauge (AWG) Calculator
    Convert American Wire Gauge (AWG) to conductor diameter and cross-sectional area, and estimate copper wire current capacity (ampacity) by density.
  • Nuclear Binding Energy Calculator
    Calculate nuclear binding energy and mass defect from protons, neutrons and nuclear mass using E = Δm·c². Get binding energy per nucleon in MeV.
  • Centripetal Acceleration Calculator
    Calculate centripetal acceleration and angular velocity from tangential velocity and radius using a = v²/r and ω = v/r. Free physics tool.

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