Convert Calculators

Electrical projects mix units constantly. Battery datasheets quote amp-hours. Appliance labels list watts. Solar panels are rated in watts and volts. Inverters advertise volt-amps. EV chargers show kilowatts. Converting between these units correctly prevents expensive mismatches—a 100 Ah 12 V bank is not the same energy reservoir as 100 Ah at 48 V, and confusing watts with volt-amps can leave you short on backup capacity.

The most common conversions in battery work are between amp-hours (Ah), watt-hours (Wh), and kilowatt-hours (kWh). Energy in watt-hours equals amp-hours multiplied by nominal voltage. Once you have watt-hours, dividing by load watts gives runtime. Converting mAh to Ah is a simple divide-by-1,000 step, but skipping it is a frequent source of mobile and small-cell errors.

Power conversions tie apparent power (VA) to real power (watts) through power factor. Motors, pumps, and cheap power supplies draw more apparent power than their real work suggests. When sizing generators, UPS units, or inverter chargers, treat VA ratings seriously—especially for mixed resistive and inductive loads.

Unit discipline also helps when comparing chemistries and form factors. A 3.7 V lithium cell bank quoted in mAh must be normalized to watt-hours before you compare it to a 12 V lead-acid pack. Likewise, DC bus voltage changes current for the same power level: doubling voltage halves amperage, which affects wire gauge and fuse selection.

WattQuick's conversion calculators are built for quick cross-checks during design and shopping. Keep voltage in the same field every time you convert, write results into your load table, and re-run when you change system architecture. Small conversion errors compound across an entire bill of materials.