Smart Home and IoT

  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • LED Current Limiting Resistor Calculator
    Calculate the series resistor needed to safely drive an LED. Enter supply voltage, LED forward voltage, and current to get resistance and power rating.
  • Power Station Runtime Calculator
    Estimate how long a portable power station or battery (in watt-hours) will run a device. Enter capacity, load watts and efficiency to get runtime in hours.
  • Celsius to Fahrenheit Thermostat Calculator
    Convert Celsius to Fahrenheit (and back) instantly. Perfect for setting your thermostat, cooking, and weather. Uses F = C × 9/5 + 32.
  • Low Voltage Wire Voltage Drop Calculator
    Calculate voltage drop in low-voltage wiring for LED, landscape & 12V/24V DC systems. Enter current, wire length and AWG gauge to size your cable.
  • kWh to CO2 Emissions Calculator
    Convert electricity use (kWh) to CO2 emissions in kilograms using your grid emission factor. Free, instant kWh to kg CO2 calculator.
  • 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.
  • Data Storage Unit Converter
    Convert data storage units between Bytes, KB, MB, GB and TB using binary (1024) conversion. Fast, accurate digital storage size converter.
  • Voltage Drop Wire Gauge Calculator
    Find the right AWG wire gauge by amps, distance, and voltage. Picks the smallest copper or aluminum conductor keeping voltage drop under your limit (US/NEC 3%).
  • PoE Power Budget Calculator
    Calculate how many PoE devices your switch power budget supports. Pick a 802.3af/at/bt class or custom watts and see max devices, total draw and headroom.

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