Sea Level Rise Impact Calculator

Estimate coastal inundation area and shoreline retreat from sea level rise based on coastline length, slope, and rise amount.

Coastline Length

Average Coastal Slope

Sea Level Rise

Tab to move between fields

Inundated Area

2.86 km²

≈ 143 city blocks

Horizontal Inundation

28.6 m

≈ 6 car lengths

Inundated Area286.4 hectares

Bruun Rule Shoreline Retreat41.7 m

Water Volume per km Coast7,161 m³

Risk LevelLow

How to Use This Calculator

Enter Coastline Length, Average Coastal Slope, and Sea Level Rise.
Review Inundated Area (km²) and Horizontal Inundation (m).
Use Inundated Area (hectares) and Bruun Rule Shoreline Retreat (m) to inform your decision.

How the result changes with Average Coastal Slope

Coastline Length: Length of the coastline segment to analyze in kilometers.
Average Coastal Slope: Average slope of the coastal zone in degrees. Flat coasts (0.1-1°) are most vulnerable; cliffs (10°+) are resistant.
Sea Level Rise: Projected sea level rise in meters. IPCC projects 0.3-1.0 m by 2100 depending on emissions scenario.

Identify Input Parameters
Coastline Length = 100, Average Coastal Slope = 1, Sea Level Rise = 0.5 = 3 input(s) provided
Calculate Inundated Area
Inundated Area
2.864 = 2.864
Calculate Horizontal Inundation
Horizontal Inundation
28.6 = 28.6
Calculate Inundated Area
Inundated Area
286.4 = 286.4
Calculate Bruun Rule Shoreline Retreat
Bruun Rule Shoreline Retreat
41.7 = 41.7