Smart Home and IoT

  • Smart Home Data Usage Calculator
    Estimate monthly internet data usage in GB from your smart home camera or streaming bitrate and daily hours. Free Wi-Fi data usage calculator.
  • Projector Screen Size Calculator
    Convert a diagonal screen size and aspect ratio into exact width, height and area in inches and centimeters for projectors and TVs.
  • Lighting Watts to Amps Calculator
    Convert lighting watts to amps instantly. Enter total fixture wattage, voltage, and power factor to find the current draw for sizing circuits and breakers.
  • Lighting kWh Usage Calculator
    Calculate the kWh energy used by your lighting and its cost. Enter bulbs, watts, hours per day and days to estimate consumption and electricity bills.
  • Maximum Lights per Circuit Calculator
    Find how many light fixtures you can safely put on a circuit. Enter voltage, breaker amps and watts per fixture to get the max count at the 80% rule.
  • Number of Bulbs Needed for a Room Calculator
    Find how many light bulbs you need for a room. Enter room area, desired light level, and lumens per bulb to get the count.
  • Foot-Candles to Lux Calculator
    Convert foot-candles (fc) to lux (lx) instantly. Enter an illuminance value and get the exact result using lux = fc × 10.7639.
  • Lux to Foot-Candles Calculator
    Convert lux to foot-candles instantly. Enter an illuminance value in lux and get the equivalent foot-candles using fc = lux / 10.7639.
  • Watts, Volts, Amps & Ohms Calculator
    Solve for voltage, current, resistance or power from any two known values using Ohm's Law (V=IR) and the power equations P=VI, P=I²R, P=V²/R.
  • Whole Home Electricity Bill Calculator
    Estimate your whole-home electricity bill by adding up each device's kWh, then applying your per-kWh rate and fixed fee. Works in any currency.
  • Dew Point Calculator
    Calculate dew point from air temperature and relative humidity using the Magnus formula. Free, accurate dew point calculator in °C for any climate.
  • Lumens Needed Calculator
    Calculate how many lumens you need to light a room. Enter room size and type to get the total lumens required for proper, comfortable brightness.
  • Appliance Energy Cost Calculator
    Calculate how much an appliance costs to run per day, month, and year from its wattage, hours of use, days per week, and your electricity rate per kWh.
  • Solar Panel System Size Calculator
    Estimate the solar PV system size (kW) and number of panels you need from your daily energy use, peak sun hours, performance ratio and panel wattage.
  • Grow Light Coverage Area Calculator
    Calculate how many square feet your grow light covers from its PPF output and your target PPFD. Free, instant grow tent coverage area calculator.
  • LED Equivalent Wattage Calculator
    Convert incandescent bulb wattage to its equivalent LED wattage. Estimate lumens, LED power draw, and energy savings using bulb efficacy.
  • Candela to Lux Calculator
    Convert candela (cd) to lux (lx) using luminous intensity and distance. Free candela-to-lux calculator with the formula lux = cd / distance².
  • LED Series-Parallel Array Calculator
    Calculate the series resistor, voltage drops, current and power for an LED array with multiple parallel strings of LEDs in series.
  • Watts to Lumens Calculator
    Convert watts to lumens using luminous efficacy (lm/W). Compare LED, CFL and incandescent brightness instantly with this free calculator.
  • HVAC BTU Calculator — AC Size by Room
    Calculate the BTU cooling capacity you need by room size. Enter length, width, occupants and sun exposure to size your AC unit correctly.
  • kWh to Cost Calculator
    Calculate the cost of electricity from kWh used and price per kWh, or from device watts and hours of use. Fast, accurate energy cost estimates.
  • LED Series Resistor Calculator
    Calculate the correct series resistor for an LED from supply voltage, LED forward voltage, and current. Get resistance and power rating instantly.
  • Battery Life / Runtime Calculator
    Estimate how long a battery will last from its mAh capacity, the device's current draw in mA, and an efficiency factor. Get runtime in hours and minutes.
  • LED vs Incandescent Bulb Savings Calculator
    Calculate how much money and electricity you save each year by switching from incandescent bulbs to LEDs based on wattage, usage hours and energy price.

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