Smart Home and IoT

  • Coefficient of Utilization (Lumen Method) Calculator
    Calculate how many light fixtures you need using the lumen method with coefficient of utilization (CU) and light loss factor (LLF).
  • Lumens to Candela Calculator
    Convert lumens to candela using the beam apex angle. Free lumens-to-candela calculator with solid angle output, formula, and a worked example.
  • Beam Angle to Spot Diameter Calculator
    Calculate the spot (beam) diameter of a light fixture from its beam angle and distance. Find spot size, radius and illuminated area instantly.
  • Candela to Lumens Calculator
    Convert candela (cd) to lumens (lm) using luminous intensity and beam apex angle. Free, accurate candela-to-lumens converter with solid angle output.
  • Watts to Lumens Calculator
    Convert watts to lumens instantly. Enter power in watts and luminous efficacy (lm/W) to find the light output in lumens for LED, CFL or incandescent bulbs.
  • Light Bulb Energy Cost Calculator
    Calculate the yearly, monthly and daily electricity cost of running a light bulb from its wattage, hours used per day and your price per kWh.
  • PPFD to DLI Calculator
    Convert PPFD (µmol/m²/s) to DLI (mol/m²/day) using your grow light's intensity and daily photoperiod. Free, instant grow-light calculator.
  • Inverse Square Law Light Intensity Calculator
    Calculate light intensity at a new distance using the inverse square law E₂ = E₁ × (d₁/d₂)². Free physics & lighting tool for lux and illuminance.
  • Luminous Efficacy Calculator
    Calculate luminous efficacy in lumens per watt (lm/W) from a light source's luminous flux and electrical power. Fast, free, and accurate.
  • Lumens per Square Foot Calculator
    Calculate foot-candles (lumens per square foot) from total lumens and room area. Free lighting calculator with instant lux conversion.
  • Lux to Lumens Calculator
    Convert lux to lumens instantly. Multiply illuminance (lux) by the illuminated area in square metres to get total luminous flux in lumens.
  • CADR & Room Size Calculator
    Find the maximum room size an air purifier can handle from its CADR rating. Calculate floor area in sq ft for any target air changes per hour (ACH).
  • mAh to Wh Battery Capacity Calculator
    Convert battery capacity from mAh to Wh instantly. Enter milliamp-hours and voltage to get watt-hours and kilowatt-hours for any battery.
  • IP Subnet & Host Count Calculator
    Calculate usable hosts, subnet mask, wildcard mask and total addresses from any IPv4 CIDR prefix (/0 to /32). Free subnetting tool.
  • IoT Sensor Battery Life Calculator
    Estimate how long an IoT sensor or wireless device will run from its battery using capacity (mAh), average current draw (mA), and a usable-capacity derating factor.
  • Room Lighting Lumens Calculator
    Calculate how many lumens a room needs based on its size and lighting purpose. Enter length, width, and light level to get total lumens and bulb count.
  • Lumens to Lux Calculator
    Convert lumens to lux instantly. Enter luminous flux (lm) and the illuminated area in m² to find illuminance (lux = lumens ÷ area).
  • Home Battery Backup Duration Calculator
    Estimate how long your home battery backup will power your house during an outage based on capacity, usable depth of discharge, and average power load.
  • LED Strip Power Supply Calculator
    Calculate the right LED strip power supply (PSU) wattage and current. Enter watts per meter, length and voltage to size a driver with safety headroom.
  • Appliance Running Cost Calculator
    Calculate the daily, monthly and yearly running cost of any appliance from its wattage, hours of use and your electricity rate per kWh.
  • Smart Home UPS / Battery Backup Runtime Calculator
    Estimate how long your UPS or home battery will power your devices. Enter capacity (Wh), load (W), inverter efficiency and depth of discharge to get runtime.
  • Solar Battery Home Backup Sizing Calculator
    Size a home solar battery backup. Enter daily energy use, backup days, and depth of discharge to find the battery capacity (kWh) you need.
  • IP Camera Bandwidth Calculator
    Calculate total network bandwidth (Mbps) and storage for IP/CCTV camera systems from bitrate per camera and number of cameras. Free online tool.
  • Ceiling Fan Size Calculator
    Find the right ceiling fan blade span for your room. Enter length and width to get a recommended fan size in inches based on room area.

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