Whole-House Surge Protector Calculator
Size a whole-house surge protector for your electrical panel. Calculate kA rating, cost, and ROI based on your home and risk profile.
Inputs
A
$
$
Results
Recommended Rating
100 kA
Protection Level2
Device Cost$250
Installation Cost$200
Potential Savings$3,688
ROI Ratio8.2x
How to Use This Calculator
- Enter your Panel Amps (100–400 A) and Home Value to size the protection level for your electrical system.
- Estimate Sensitive Electronics Value (computers, TVs, appliances) — this determines how much coverage you need.
- Select your Lightning Risk level (low, medium, high) based on NOAA ground flash density for your region.
- Review Recommended kA — the minimum surge current rating your whole-house protector should have.
- Check Protection Level (1–3) and Device Cost to select a unit at or above the minimum recommended kA rating.
- Use Potential Savings and ROI to compare the device cost against the electronics at risk from a single surge event.
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