All Calculators | WattQuick

Battery

Runtime, charging, and charge level

Battery Percentage

Find remaining charge as a percentage of full capacity.

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Battery Runtime

Estimate how long a battery lasts at a given power draw.

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Battery Charging Time

Calculate how long it takes to charge a battery at a given current.

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Battery Sizing

Banks, inverters, and system sizing

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Battery Bank Size (Ah)

Size a battery bank in amp-hours from load, runtime, and voltage.

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Inverter Sizing

Find minimum inverter size from peak load and safety margin.

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DC Cable Size Calculator

Recommend DC wire gauge from current, one-way length, and system voltage.

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Backup

Critical loads, UPS runtime, and outage planning

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UPS Runtime

Estimate backup time from battery energy and load power.

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Critical Load Analysis

Plan home backup power by listing essential devices, daily runtime, and target outage hours.

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Power

Watts, amps, and electrical power

Watts to Amps

Convert electrical power (watts) to current (amps) at a given voltage.

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Amps to Watts

Convert current (amps) and voltage into power (watts).

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Residential AC Voltage Drop Calculator

Calculate AC voltage drop in home wiring from supply voltage, amps, cable length (m), and AWG or mm² copper size.

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Solar

Panels, yield, and off-grid storage

Solar Panel Size

Estimate minimum panel wattage from daily energy use and sun hours.

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Solar Daily Yield

Estimate daily energy output from panel wattage and sun hours.

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Solar Battery Bank Size

Size an off-grid battery bank from daily use and backup days.

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EV Charging

Home charging time and cost

EV Charging Cost

Estimate home charging cost from energy used and your utility rate.

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EV Charge Time

Estimate how long an EV charge takes at a given charger power.

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EV Cost Per Mile Calculator

Estimate driving cost from electricity rate and energy used per mile.

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Commercial EV

Fleet trucks, vans, buses, and industrial EV

EV Truck Range vs. Payload Calculator

Estimate how cargo weight reduces electric truck range from rated empty miles.

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EV Fleet TCO vs. Gas Calculator

Compare annual fuel energy cost for gas and electric fleets by mileage.

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Transit Bus Battery kWh per Mile

Calculate energy intensity from route miles and metered kWh use.

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E-Bike

Range, charging, TCO decisions, motor power, and e-bike battery health

E-Bike Range Estimator

Physics-based range estimate from battery Wh, assist level, rider weight, and wind/terrain factors.

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E-Bike Full Charge Cost Calculator

Calculate the cost of a full battery charge from pack capacity and your home electricity rate.

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E-Bike Max Speed Calculator

Estimate theoretical top speed from battery voltage, motor KV rating, and wheel diameter.

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E-Scooter

Tyre pressure, hill climb, charge time, and commuter economics for light EVs

E-Scooter Range Calculator

Estimate remaining range with SOC slider, tyre pressure, and voltage sag at 36 / 48 / 52 V.

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E-Scooter Tyre Pressure & Rolling Resistance

See how under-inflation on 8–10″ wheels raises Wh/km and cuts range.

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E-Scooter Max Speed Calculator

Theoretical top speed from voltage, motor KV, and wheel diameter.

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RV & Marine

RV solar, marine banks, camping and portable power

RV Solar & House Battery Calculator

Match rooftop panel yield to daily 12V/24V loads and bank Ah shortfall.

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Marine Trolling Motor Runtime Calculator

Continuous amp draw vs. bank Ah for trolling and house loads.

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Portable Power Station Recharge Times

Compare wall AC, car 12V, and solar MPPT hours to refill Wh capacity.

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Appliances

Daily use and electricity cost

Appliance Daily Cost

Calculate daily electricity cost for any appliance from watts and runtime.

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Appliance Monthly Energy

Convert appliance watts and daily use into monthly kWh.

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Energy Consumption Calculator

Estimate total kWh from watts, hours per day, and number of days.

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Green Home

Insulation, lighting, HVAC, standby power, and envelope efficiency

Building Heat Loss & Insulation Calculator

Estimate heat loss watts from envelope area, ΔT, and R-value.

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Home Insulation Savings Calculator

Estimate annual heating and cooling savings from upgrading wall insulation and windows—before/after energy use and efficiency score.

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LED Savings & ROI Calculator

Compare legacy bulb vs. LED costs, CO₂ savings, and payback time for a single fixture.

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Pool

Pool pumps, heating, covers, and seasonal operating cost

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Pool Energy Cost & Thermal Cover Savings Calculator

Pool pump and heating cost by technology (resistance vs. heat pump COP) plus thermal cover savings on evaporation load.

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TOU

Time-of-use rates, peak shaving, demand charges, and arbitrage

Time-of-Use Load Shifting Savings

Savings from moving kWh from peak to off-peak rate periods.

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Commercial Demand Charge Calculator

Monthly penalty from peak kW demand and $/kW tariff.

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V2G Grid Buyback Revenue Calculator

Estimate monthly revenue from bidirectional EV export at utility buyback rates.

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Cost

Battery pack pricing estimates

2 tools

Battery Cost Estimator

Estimate pack cost from capacity, voltage, and price per watt-hour.

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Electricity Bill Estimator

Estimate your bill from total kWh usage and rate per kWh.

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Convert

Ah, Wh, kVA, and unit conversions

Ah to Wh Converter

Convert amp-hours to watt-hours using battery voltage.

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Wh to Ah Converter

Convert watt-hours to amp-hours using system voltage.

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kVA to kW Converter

Convert apparent power (kVA) to real power (kW) using power factor.

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