What Is an Anchor Holding Power Calculator?
Anchor holding power depends on far more than weight alone — anchor design and seabed composition both play a major role in how much load an anchor can resist before it drags. This calculator applies commonly published, order-of-magnitude relative multipliers for common anchor types and bottom conditions to give you a rough, comparative holding-power estimate.
It's designed to help you compare options — for example, whether a fluke anchor or a plow anchor is likely to perform better on your typical anchoring bottom — rather than to provide an exact, certified load rating.
How to Read Your Results
Estimated Holding Power
Anchor weight multiplied by the selected bottom/type multiplier, giving a rough estimated holding force in pounds.
Multiplier Used
Shows the specific multiplier applied for your chosen anchor type and bottom composition, so you can see how sensitive the estimate is to your selections.
Rating
A plain-language read of how well-suited your anchor type is likely to be for the selected bottom.
Real-World Example
A 22-pound fluke (Danforth-style) anchor is set in sand.
| Value | Amount |
|---|---|
| Anchor weight | 22 lb |
| Anchor type | Fluke / Danforth |
| Bottom | Sand |
| Multiplier | 45× |
| Estimated holding power | ≈990 lb |
This reflects the well-known strength of fluke-style anchors in sand, where a relatively light anchor can dig in and resist a load many times its own weight.
Tips for Choosing and Sizing an Anchor
- Match the anchor to your typical bottom — fluke anchors excel in mud and sand but struggle on rock or heavy grass.
- Size up, not down — most manufacturers' sizing charts are based on calm-condition holding; going one size larger adds a real safety margin.
- Combine with adequate scope — even the best anchor underperforms badly with too little rode out.
- Carry a second, different-style anchor if you regularly anchor in mixed or unfamiliar bottom types.
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Last updated: August 2026 · Reviewed by: Simple Calculator Tools Editorial Team