Electrical Charge Converter and Calculator

Choose units and enter a value; results update immediately. Negative charge and scientific notation are supported. The additional calculation panels have independent inputs.

Enter a valid number. 0; 10⁻²⁴ ≤ |x| ≤ 10²⁴

Charge, current and time

For constant current, Q = I × t. The graph starts at zero transferred charge and is a straight line, not a real battery charging curve. Time cannot be negative. To find current, time must exceed zero; to find time, current must be nonzero and the signs must agree.

Enter a valid number. t ≥ 0; I = Q/t: t > 0; t = Q/I: I ≠ 0, Q/I ≥ 0

Battery charge and energy

Enter a valid number. Q ≥ 0; U > 0

Ah and mAh measure charge, not energy. Estimated Wh = Ah × nominal V; this assumes the stated voltage. Real battery voltage, usable capacity and losses vary. This is not a prediction of actual charging time or runtime.

Capacitor charge

Enter a valid number. Ccap > 0

For an ideal linear capacitor, Q = Ccap × U. Here Ccap is capacitance in farads (F), not charge in coulombs (C). A farad is not a faraday. A signed voltage gives a signed plate charge; the opposite plate has the opposite charge.

Batch conversion

Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.

Enter one value per line or separate values with semicolons, up to 100 values. A decimal point or comma is accepted; do not use thousands separators. The units above apply to every row.