Physics and Engineering

  • Mixing Two Fluids Final Temperature Calculator
    Calculate the final equilibrium temperature when two fluids are mixed, using mass, specific heat, and starting temperatures. Free physics tool.
  • Percent Efficiency Calculator
    Calculate percent efficiency from useful output and total input energy. Free online efficiency calculator using output/input × 100, with energy loss.
  • Total Head (Bernoulli) Calculator
    Compute total hydraulic head H = z + P/ρg + v²/2g from elevation, pressure, velocity and fluid density using the Bernoulli equation. Free engineering tool.
  • Hydraulic Power Calculator
    Calculate hydraulic (fluid) power from flow rate and pressure with P = Q × ΔP. Get kW, watts and the input power needed at a given pump efficiency.
  • Head Loss per 100 ft Calculator (Hazen-Williams)
    Calculate Hazen-Williams friction head loss in feet of water per 100 ft of pipe from flow rate (gpm), inside diameter, and C coefficient. US units.
  • SCFM to ACFM Calculator
    Convert SCFM to ACFM using actual pressure and temperature. Free airflow conversion calculator for compressors, blowers, and HVAC systems.
  • Terminal Velocity (Newton Regime) Calculator
    Calculate terminal settling velocity in the Newton (turbulent) regime from mass, gravity, fluid density, frontal area and drag coefficient.
  • Pump Hydraulic Power (kW) Calculator
    Calculate pump hydraulic power in kW from fluid density, gravity, flow rate and head using P = ρgQH. Also outputs watts, horsepower and shaft power.
  • Pump Brake Power & Efficiency Calculator
    Calculate pump brake (shaft) power from fluid density, flow rate, head and efficiency using P = ρgQH/η. Get kW and hp output instantly.
  • Pressure Drop from Flow Rate Calculator
    Calculate pipe pressure drop with the Darcy-Weisbach equation from friction factor, length, diameter, fluid density, and velocity. Get results in Pa, kPa, and bar.
  • Watt's Law Calculator
    Free Watt's Law calculator. Solve for power (P), voltage (V), or current (I) using P = V × I. Enter any two values to find the third instantly.
  • Electricity Units to kWh Calculator
    Convert electricity units to kilowatt-hours (1 unit = 1 kWh) and estimate your bill cost from units consumed and your per-unit tariff.
  • kWh from Amps, Volts and Hours Calculator
    Calculate electricity usage in kWh from amps, volts and hours. Enter current, voltage and run time to get energy used, power in watts and cost.
  • Electric Field of a Point Charge Calculator
    Calculate the electric field E of a point charge using E = kQ/r². Enter charge Q in coulombs and distance r in meters to get the field in N/C.
  • Motor Torque from kW and RPM Calculator
    Calculate electric motor torque in newton-metres from power (kW) and speed (RPM) using T = 9549 x kW / RPM. Includes lb-ft conversion.
  • Time to Fill Tank Calculator
    Calculate how long it takes to fill a tank from its volume and water flow rate using t = V / Q. Supports liters, gallons, m3, and multiple flow units.
  • Battery Discharge Time Calculator
    Estimate how long a battery will last from its amp-hour capacity, load current, and usable depth of discharge. Free runtime calculator: t = (Ah × DoD) / A.
  • Monthly Electricity Cost from Watts Calculator
    Calculate the monthly electricity cost of any device from its wattage, daily usage hours and your per-kWh rate. Get daily, monthly and yearly estimates.
  • Electricity Bill Calculator
    Estimate your electricity bill from units consumed (kWh), the per-unit rate, and any fixed charge. Free, fast, and works with any currency.
  • Power from Torque and RPM Calculator
    Calculate mechanical power in kW, watts and horsepower from torque (N·m) and rotational speed (RPM) using P = T × RPM / 9549.
  • Milliamps to Amps Calculator
    Convert milliamps (mA) to amps (A) instantly. Enter a current in mA and get the value in amperes using A = mA / 1000.
  • Water Horsepower Calculator
    Calculate water horsepower (WHP) from flow rate, total head, and specific gravity using WHP = (Q·H·SG)/3960. Free pump hydraulic power tool.
  • Gas Density Calculator
    Calculate the density of an ideal gas from pressure, molar mass, and temperature using ρ = PM/(RT). Free, instant results in kg/m³ and g/L.
  • EV kWh per 100 km Calculator
    Calculate your electric vehicle energy consumption in kWh per 100 km from the energy used and distance driven. Get km/kWh and Wh/km too.

Categories