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Capacitor Energy Calculator

Science & Engineering

E = ½CV² · stored charge · supercaps & electrolytics

Quick Answer

Capacitor Energy Calculator: E = ½CV² · stored charge · supercaps & electrolytics. Capacitor Energy Calculator uses standard science & engineering formulas to compute accurate results instantly.

How it works

  1. 1E=½CV² — double the voltage, 4× the energy
  2. 2Charge Q=CV sets the current-time integral available
  3. 3½CV² is stored; the other half dissipates in loop resistance
  4. 4Farad-class supercaps reach kJ; millifarad electrolytics only mJ

Capacitor parameters

µF
V
Stored energy1.47J
Charge：0.118 C
Equivalent：0.0004 Wh
Energy scales with V², but never exceed the electrolytic rating (venting risk) — keep ~20% headroom. In series add balancing resistors; in parallel capacitance adds and voltage rating is the lowest. Caps discharge in milliseconds — great for buffering and flash lamps, not for replacing batteries. Large caps can stay charged after power-off: discharge before servicing.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Capacitor Energy Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Capacitor Energy Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: E = ½CV² · stored charge · supercaps & electrolytics.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Capacitor Energy Calculator formula

Capacitor Energy Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Capacitor Energy Calculator?
Open the page and fill in the input fields — results update automatically. E = ½CV² · stored charge · supercaps & electrolytics.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Capacitor Energy Calculator[EB/OL]. https://www.yijiansuan.com/en/c/science/capacitor-energy

Results provided by this tool are for reference only and do not constitute professional advice.