Runway Calculator Logo
RunwayCalculator
ICAO Aerodrome Gradient Analysis

Runway Slope Calculator

Calculate longitudinal runway gradient percentages, evaluate elevation changes between thresholds, and check ICAO 2.0% maximum compliance.

Runway Elevation & Length Inputs

ICAO Annex 14 Standard:

The longitudinal slope along any runway code number 3 or 4 should not exceed 1.0% to 1.25%, and never exceed 2.0% for any runway code.

Runway Gradient & Slope
1.2% Uphill

Elevation difference of 60 feet across a 5,000 ft runway.

ICAO 2% Compliance:Compliant (≤ 2.0%)
Takeoff Ground Roll Impact:

An uphill slope of 1.2% increases takeoff ground roll by approximately 12% (roughly 10% per 1% uphill slope).

Landing Rollout Impact:

An uphill slope aids deceleration and decreases landing rollout distance.

navigation.aviationTools

Explore more precision calculators to streamline your planning.

navigation.allAviation
aviationTools.crosswindaviation

aviationTools.crosswindDesc

common.launchTool
aviationTools.runwayNumberaviation

aviationTools.runwayNumberDesc

common.launchTool
aviationTools.runwayLengthaviation

aviationTools.runwayLengthDesc

common.launchTool
aviationTools.rvraviation

aviationTools.rvrDesc

common.launchTool

Runway Slope Frequently Asked Questions

Everything you need to know about cash runway, burn rates, and financial planning.

Runway Slope (%) = (Absolute Elevation Difference between Thresholds ÷ Runway Physical Length) × 100. For example, a 6,000 ft runway with a 60 ft elevation change has a slope of (60 ÷ 6,000) × 100 = 1.0%.