Anchor Rode Length Calculator

Calculate the proper anchor rode length (scope) based on water depth, tidal range, and conditions. Get the right scope for safe anchoring.

Results

Visualization

How It Works

Scope is the ratio of rode length to the vertical distance from the bow roller to the seabed. Standard scope ratios: 5:1 calm, 7:1 moderate, 10:1 storm. All-chain rode provides better holding at lower ratios (3:1 to 5:1) because the chain weight keeps the pull angle low. Always calculate scope at high tide — the worst case. Your swing radius determines how close other boats can anchor. Check your anchor alarm if anchoring overnight.