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Capacitor Size Calculator
Capacitance needed to hold up a load for a time or smooth ripple, from current, time and allowed voltage drop.
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Capacitance
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Capacitance needed to hold up a load for a time or smooth ripple, from current, time and allowed voltage drop.
Capacitor Size Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: C = I x t / dV.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Capacitor Quick Guide
Typical values for reference.
| Current A | Time ms | Droop V | C uF |
|---|---|---|---|
| 0.1 | 20 | 1 | 2,000 uF |
| 0.5 | 20 | 1 | 10,000 uF |
| 1 | 20 | 1 | 20,000 uF |
| 5 | 20 | 1 | 100,000 uF |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Capacitor Size Calculator FAQ
Answers to common questions about this calculator.
C = I x t / delta V.
At least 1.5 times the working voltage.
C = I x t / dV.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.