All calculators
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- ConvertOpen calculator
Ah to Wh Converter
Convert amp-hours to watt-hours using battery voltage.
- ConvertOpen calculator
Wh to Ah Converter
Convert watt-hours to amp-hours using system voltage.
- ConvertOpen calculator
kVA to kW Converter
Convert apparent power (kVA) to real power (kW) using power factor.
- ConvertOpen calculator
kW to HP Converter
Convert kilowatts to mechanical horsepower instantly.
- PowerOpen calculator
Watts to Amps
Convert electrical power (watts) to current (amps) at a given voltage.
- PowerOpen calculator
Amps to Watts
Convert current (amps) and voltage into power (watts).
- BatteryOpen calculator
Battery Percentage
Find remaining charge as a percentage of full capacity.
- BatteryOpen calculator
Battery Runtime
Estimate how long a battery lasts at a given power draw.
- BatteryOpen calculator
Battery Charging Time
Calculate how long it takes to charge a battery at a given current.
- Battery SizingOpen calculator
Battery Bank Size (Ah)
Size a battery bank in amp-hours from load, runtime, and voltage.
- SolarOpen calculator
Solar Panel Size
Estimate minimum panel wattage from daily energy use and sun hours.
- SolarOpen calculator
Solar Daily Yield
Estimate daily energy output from panel wattage and sun hours.
- SolarOpen calculator
Solar Battery Bank Size
Size an off-grid battery bank from daily use and backup days.
- EV ChargingOpen calculator
EV Charging Cost
Estimate home charging cost from energy used and your utility rate.
- EV ChargingOpen calculator
EV Charge Time
Estimate how long an EV charge takes at a given charger power.
- AppliancesOpen calculator
Appliance Daily Cost
Calculate daily electricity cost for any appliance from watts and runtime.
- AppliancesOpen calculator
Appliance Monthly Energy
Convert appliance watts and daily use into monthly kWh.
- Battery SizingOpen calculator
Inverter Sizing
Find minimum inverter size from peak load and safety margin.
- CostOpen calculator
Battery Cost Estimator
Estimate pack cost from capacity, voltage, and price per watt-hour.
- BackupOpen calculator
UPS Runtime
Estimate backup time from battery energy and load power.
- PowerOpen calculator
Ohm's Law Calculator
Find voltage, current, or resistance when you know any two values (V = I × R).
- PowerOpen calculator
Volts to Watts Calculator
Convert voltage and current into electrical power in watts.
- PowerOpen calculator
Watts to Volts Calculator
Find voltage from power and current (V = W ÷ A).
- PowerOpen calculator
Power Factor Calculator
Calculate power factor from real power (kW) and apparent power (kVA).
- AppliancesOpen calculator
Energy Consumption Calculator
Estimate total kWh from watts, hours per day, and number of days.
- BatteryOpen calculator
Battery Energy Calculator
Calculate battery energy in watt-hours from amp-hours and voltage.
- BatteryOpen calculator
Battery Depth of Discharge Calculator
Calculate how much of a battery's capacity has been used (DoD %).
- BatteryOpen calculator
Battery Efficiency Calculator
Calculate round-trip efficiency from energy out and energy in.
- SolarOpen calculator
Solar Charge Controller Size Calculator
Estimate minimum charge controller amperage from panel watts and system voltage.
- SolarOpen calculator
Solar Inverter Efficiency Calculator
Calculate inverter efficiency from AC output and DC input power.
- SolarOpen calculator
Solar Array Current Calculator
Estimate array current from total panel watts and system voltage.
- SolarOpen calculator
Solar Panel Tilt Calculator
Recommended panel tilt angle based on your latitude (year-round estimate).
- EV ChargingOpen calculator
EV Cost Per Mile Calculator
Estimate driving cost from electricity rate and energy used per mile.
- EV ChargingOpen calculator
EV Battery Range Calculator
Estimate driving range from battery size, efficiency, and consumption.
- EV ChargingOpen calculator
Level 1 vs Level 2 EV Charging Time
Compare how long the same charge takes on Level 1 and Level 2 home charging.
- CostOpen calculator
Electricity Bill Estimator
Estimate your bill from total kWh usage and rate per kWh.
- AppliancesOpen calculator
Electric Heater Cost Calculator
Estimate heating cost from wattage, run hours, days, and electricity rate.
- AppliancesOpen calculator
Air Conditioner Energy Cost Calculator
Estimate monthly AC electricity cost from watts, daily hours, and rate.
- AppliancesOpen calculator
Refrigerator Energy Usage Calculator
Estimate refrigerator kWh and cost from wattage and electricity rate.
- Battery SizingOpen calculator
DC Cable Size Calculator
Recommend DC wire gauge from current, one-way length, and system voltage.
- EV ChargingOpen calculator
EV DC Fast Charging Calculator (10–80%)
Estimate DC fast-charge time with taper above 80% SOC—live as you adjust pack size and charger power.
- EV ChargingOpen calculator
EV Winter Range Loss Calculator
Estimate cold-weather driving range from EPA rating, temperature, and cabin heat use.
- EV ChargingOpen calculator
EV vs. Gas Car Savings Calculator
Compare monthly and yearly fuel costs between gasoline and electric driving.
- EV ChargingOpen calculator
EV Battery Health & Degradation Estimator
Rough state-of-health estimate from age, mileage, and DC fast-charging habits.
- EV ChargingOpen calculator
EV Public Charging & Idle Fee Calculator
Total session cost including energy, connection fee, and idle penalties—updates live.
- SolarOpen calculator
Solar Panel Roof Space Calculator
Estimate how many panels fit on your roof and total system size in kW—updates live.
- SolarOpen calculator
Solar Payback Period (ROI) Calculator
Estimate payback time and 25-year savings from system cost, production, and electricity rates.
- SolarOpen calculator
Solar Panel Angle & Tilt Optimizer
Optimal tilt and azimuth from latitude and season—fixed, summer, or winter mounting.
- SolarOpen calculator
Grid-Tie Net Metering Calculator
Compare monthly bills with solar: self-use, export credits, and grid imports.
- SolarOpen calculator
Solar Panel Degradation Calculator
Estimate remaining annual output and capacity after years of panel degradation.
- BatteryOpen calculator
Battery Series & Parallel Calculator
Calculate pack voltage, amp-hours, and watt-hours from series/parallel cell layout.
- BatteryOpen calculator
Battery C-Rate Calculator
Find discharge C-rate and runtime from capacity and load current—updates live.
- BatteryOpen calculator
Inverter Loss Calculator
Convert DC input watts to AC output and show power lost as heat in the inverter.
- BatteryOpen calculator
Home Backup Battery Sizing Calculator
Size a backup battery bank for essential loads, runtime, voltage, and depth of discharge.
- BatteryOpen calculator
Battery Voltage Drop Calculator
Estimate DC wire voltage drop and voltage at the load from amps, length, and system voltage.
- AppliancesOpen calculator
Crypto Mining Power Calculator
Estimate kWh and electricity cost for GPU/ASIC rigs by wattage and run hours.
- AppliancesOpen calculator
Standby Power Waste Calculator
Quantify phantom load cost from devices left plugged in 24/7 on standby.
- AppliancesOpen calculator
Generator Fuel Consumption Calculator
Estimate fuel use per hour and runtime from tank size at your load level.
- AppliancesOpen calculator
Heat Pump vs. Resistance Heat Calculator
Compare electric heating cost: resistance strips (COP 1) vs. heat pump COP.
- AppliancesOpen calculator
Whole House Energy Budget Calculator
Sum daily kWh by category and estimate monthly and annual electricity cost.