Capacitor Energy & Charge Calculator
⏚C
Capacitor Energy & Charge Calculator
Stored charge (Q), stored energy (E), and constant-current charge time for a capacitor
Mode
Result
Stored Energy
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Charge (Q = C×V)
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Capacitance Needed
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Charge Time @ Constant I
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Formulas: Q = C×V (charge, Coulombs). E = ½×C×V² = ½×Q×V (energy, Joules). Reverse mode solves C = 2E/V² for a target
stored energy at a given voltage. Charge time (constant-current approximation) uses t = Q/I — this ignores the resistance-limited
RC charging curve and assumes an ideal constant-current source, common for flash-capacitor and supercapacitor sizing estimates.
