Power Conversion Suite
High-accuracy conversion tools between watts, amperes, volts, horsepower, thermal BTUs, apparent kVA, and advanced physics energy units.
Convert to Watts (Real Power)
HP to Watts
Convert mechanical, metric, or electrical horsepower directly to watts.
kW to Watts
Multiply kilowatts (kW) by 1,000 to find active load draw in watts.
Amps to Watts
Convert amperes to watts using voltage and circuit power factors.
Volts to Watts
Calculate wattage using voltage limits combined with current or resistance.
BTU/hr to Watts
Convert heat energy rates (BTU per hour) to electrical watt loads.
kVA to Watts
Convert apparent generator power (kVA) to real power in watts.
MW to Watts
Convert utility megawatt levels back to standard active watts.
Convert from Watts (Reverse Output)
Watts to HP
Convert electrical active power in watts to mechanical engine horsepower.
Watts to kW
Divide standard active power by 1,000 to find kilowatts rating.
Watts to Amps
Determine current flow in amperes using wattage loads and volts.
Watts to Volts
Find voltage limits using active power values and electrical current.
Watts to BTU/hr
Convert resistive heating power in watts to BTU/hr thermal capacity.
Watts to kVA
Convert real wattage to apparent volt-amperes for grid transformers.
Watts to MW
Convert large active load demands into power grid megawatt figures.
Advanced Physics & Simulation
Watts to kWh
Calculate cumulative energy consumption in kilowatt-hours and costs.
Watts to VA
Convert active power to apparent power (Volt-Amperes) for UPS backup sizing.
Watts to Joules
Convert power ratings in watts to work output in joules per second.
3D Grid Simulator
Route simulated power loads visually and test grid breaker thresholds.
SI Prefix Scaling Family
milliwatts to watts
Convert low milliwatt levels (mW) back to standard active watts.
watts to milliwatts
Convert standard active power to milliwatts (mW) for lasers or LEDs.
microwatts to watts
Convert micro-power levels (µW) for sensors and biomedical grids.
nanowatts to watts
Convert nanowatts (nW) to watts for molecular and quantum research.
picowatts to watts
Convert picowatts (pW) to watts for radio frequency calculations.
gigawatts to watts
Convert power grids (GW) back to standard active watts.
terawatts to watts
Convert terawatts (TW) to watts for global energy metrics.
hectowatts to watts
Convert hectowatts (hW) back to standard active watts.
kW to MW
Convert kilowatt generator levels to megawatts directly.
watts to GW
Convert standard active power to grid scale gigawatts.
Energy & Time to Power
joules to watts
Convert work in Joules (J) to active power in Watts.
kilojoules to watts
Convert kilojoules (kJ) to watts using custom time bounds.
kwh to watts
Convert utility kilowatt-hours (kWh) to active load draw.
wh to watts
Convert battery capacity (Wh) to load draw rates in watts.
calories to watts
Convert gram calories (cal) to electrical active watts.
kcal/h to watts
Convert heat rates in kcal/h to standard active watts.
btu to kwh
Convert BTU thermal energy directly to kilowatt-hours.
mj to watts
Convert megajoules (MJ) to watts using custom time bounds.
therms to watts
Convert gas therms to electrical watts over time.
eV/s to watts
Convert electronvolts per second to watts for physics.
erg/s to watts
Convert ergs per second to watts for astronomy.
ft-lb/s to watts
Convert foot-pounds per second to mechanical watts.
ft-lb/min to watts
Convert foot-pounds per minute to mechanical watts.
kgf·m/s to watts
Convert kilogram-force meters per second to watts.
HVAC & Thermal Power
tons to watts
Convert refrigeration cooling tons (TR) to thermal watts.
watts to tons
Convert cooling capacity in watts to tons of refrigeration.
btu/min to watts
Convert thermal energy rate in BTU per minute to watts.
watts to btu/hr
Convert heating capacity in watts to thermal BTU per hour.
boiler HP to watts
Convert steam boiler horsepower (BHP) to metric watts.
edr to watts
Convert equivalent direct radiation radiator sizing to watts.
kcal/h to BTU/hr
Convert heat rates in kcal/h to BTU/hr and watts.
TR to kW
Convert tons of refrigeration (TR) to kilowatts cooling.
watts / sq ft
Size electric space heaters in watts per square foot.
SEER to watts
Convert AC SEER ratings to average cycle power draw.
RF, Audio & Signal
dBm to watts
Convert decibels relative to 1 milliwatt (dBm) to active power.
watts to dBm
Convert active power in watts to logarithmic dBm levels.
dBW to watts
Convert satellite and broadcast power levels in dBW to watts.
watts to dBW
Convert active power in watts to logarithmic dBW levels.
dB gain calculator
Calculate output power using decibel gain and input power.
dBµV to watts
Convert voltage levels in dBµV to power using circuit impedance.
RMS watts calculator
Convert peak voltage to continuous speaker RMS power.
SPL to watts
Calculate required amplifier watts for sound pressure level targets.
Light & Photometry
lumens to watts
Convert visible light output in lumens to electrical bulb wattage.
watts to lumens
Convert light bulb wattage to output brightness in lumens.
lux to watts
Convert surface illuminance in lux to lighting power draw.
candela to watts
Convert beam intensity in candela to power in watts.
footcandles to watts
Convert US illuminance in footcandles to power in watts.
PPFD to watts
Calculate horticultural grow light wattage from PPFD targets.
PAR watts calculator
Convert grow light power draw to photosynthetically useful watts.
UV watts calculator
Calculate UVC lamp power required for target sterilization doses.
LED equivalent sizer
Convert incandescent bulb wattage to LED/CFL equivalents.
Electrical Derived Calculators
ohms to watts
Calculate power draw from voltage, current, and resistance in ohms.
volts & amps to watts
Convert volts and amperes directly to active watts.
3-phase power calculator
Compute real power capacity for three-phase AC systems.
power factor calculator
Calculate AC power load efficiency from kW and kVA.
kVAR calculator
Convert reactive kVAR power to apparent kVA capacity.
milliamps to watts
Convert current in milliamps to watts at standard voltages.
watts to milliamps
Convert power in watts to current in milliamps for devices.
12V amps to watts
Convert current in amps to watts at a fixed 12 Volt rating.
amps to watts 240V
Convert current in amps to watts at a fixed 240 Volt rating.
DC to AC watts
Calculate AC inverter output capacity from DC inputs.
VA to watts
Convert apparent power in VA to active power in watts.
MVA to watts
Convert mega apparent power in MVA to real active power.
watts to heat output
Convert electrical power draw in watts to BTU/hr thermal heat.
voltage drop sizer
Calculate wire run power dissipation losses in watts.
Ah to Wh converter
Convert battery capacity in Ah to energy storage in Wh.
Wh to Ah converter
Convert battery storage energy in Wh to capacity in Ah.
C-rating to watts
Calculate max continuous power output from battery C-ratings.
watts to amps (3-phase)
Convert three-phase active power in watts to current in amps.
short circuit calculator
Determine transformer peak short circuit fault capacities.
Mechanical & Motion
torque to watts
Convert mechanical torque and RPM to power output in watts.
RPM to watts
Convert motor rotational speed in RPM to power using torque.
PS to watts
Convert European metric horsepower Pferdestärke (PS) to watts.
BHP to watts
Convert engine brake horsepower (BHP) capacity to watts.
WHP to watts
Convert wheel horsepower (WHP) outputs to watts and kW.
N·m/s to watts
Convert mechanical work rate in Newton-meters per second to watts.
poncelet to watts
Convert obsolete French poncelet power units to active watts.
donkeypower to watts
Convert fun donkeypower units directly to active watts.
hydraulic HP to watts
Convert hydraulic GPM flow and PSI pressure to electric watts.
CFM to watts
Convert ventilation air flow and pressure drops to fan watts.
Fitness & Human Power
calories to watts
Convert exercise metabolic calorie burn rate to mechanical watts.
watts to calories
Convert training mechanical output watts to calorie burn rates.
watts per kg
Calculate your relative cycling FTP ratio in Watts/kg.
METs to watts
Convert metabolic equivalent (MET) intensity levels to mechanical watts.
running pace to watts
Estimate running mechanical power output from pace and weight.
rowing split to watts
Convert Concept2 500m split times to calibrated mechanical watts.
Solar & Renewable
solar panel output
Calculate real daily energy yields from solar panel ratings.
W/m² to watts
Convert solar irradiance values to total active panel watts.
kWp to watts
Convert solar system kilowatt peak (kWp) sizes to kWh output.
wind speed to watts
Calculate wind turbine output wattage from wind speeds.
solar panels needed
Determine the number of solar panels required for loads.
battery runtime sizer
Calculate backup battery running time for load wattages.
generator size sizer
Use the load-picker checklist to size backup home generators.
UPS runtime calculator
Determine standby UPS battery runtimes for hardware loads.
Cost & Consumption Tools
watts to cost
Calculate appliance operating costs per day, month, and year.
kWh cost calculator
Calculate utility billing costs directly from energy totals.
watts to CO2
Determine carbon emissions footprints of appliance wattages.
appliance wattage sizer
Interactive load checklist to profile house wattages.
watts per day
Calculate daily energy consumption using duty cycle rates.
mining power cost
Calculate hardware power operating costs and net yields.
Value-Specific Long-Tail Pages
1 HP to watts
Convert exactly 1 mechanical horsepower directly to watts (746W).
5 HP to watts
Convert 5 horsepower to active electrical and mechanical watts.
1 kVA to watts
Convert 1 kVA apparent power capacity to active real watts.
5 kVA to watts
Convert 5 kVA generator apparent capacity directly to real watts.
12000 BTU to watts
Convert 12,000 BTU/hr cooling or heating capacity to thermal watts.
5000 BTU to watts
Convert 5,000 BTU/hr cooling capacity to active thermal watts.
15 amps to watts
Convert 15 Amps to active capacity at 120V or 240V circuits.
20 amps to watts
Convert 20 Amps to active capacity at 120V kitchen branch loops.
100 amps to watts
Determine active power capacity of standard 100 Amp service panels.
1.5 ton to watts
Convert 1.5 Tons of refrigeration cooling load to active watts.
1000 watts to amps
Calculate current draw in amperes of a 1,000 Watt load at 120V.
1500 watts to amps
Calculate current draw in amperes of a 1,500 Watt heater at 120V.
3000 watts to amps
Calculate current draw in amperes of a 3,000 Watt load at 240V.