Flood Insurance Tiered Calculator

Flood insurance layers NFIP with private excess. This calculator computes total premium.

Replacement value

NFIP limit

NFIP premium

Excess limit

Excess rate/$100

Total premium

$50,800

Excess premium

$44,000

Total coverage

$8,500,000

How the math works

Excess premium = excess limit × rate. Total = NFIP + excess. Coverage = NFIP + excess limits.

Size excess flood to full replacement cost, not market value. Flood losses recover on RCV basis, not market comps. A $8.5M replacement building with only $500k NFIP is 94% uninsured for flood — almost always worth the excess premium regardless of flood-zone classification.

How to Use

Enter building replacement value.
Enter NFIP limit (usually $500k max).
Enter NFIP premium.
Enter excess flood limit.
Enter excess flood rate per $100.
Read total premium.

Frequently Asked Questions

NFIP limits?

NFIP caps at $500k building + $100k contents for commercial. Residential: $250k + $100k. Multifamily: $500k per building + $100k contents. Cap dramatically undersized for most commercial — excess flood needed for RCV coverage.

Excess flood?

Private market excess flood: $1M-100M+ limits available. Rate $0.15-1.50 per $100 coverage depending on flood zone (A/V/X). Risk-5 zone (historical flooding): high rate. X zone (minimal risk): lower rate.

FEMA changes?

Risk Rating 2.0 (launched 2021): NFIP now risk-based. Premiums for high-risk properties can increase 18% annually up to cap. Some properties losing subsidized rates. Check current rate at renewal.