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Sacrificial Anode Weight Calculator

Zinc, Aluminum, and Magnesium Anode Sizing for Hull, Shaft, Rudder, and Heat Exchanger Protection per ABYC E-2

Free sacrificial anode source-aware screen for marine mechanics, boatyards, vessel owners, and corrosion-review conversations. Enter hull material, local wetted-area prompts, shaft and propeller dimensions, rudder and trim-tab area, water type, and a service interval. The app returns a local current-demand worksheet, local alloy-capacity weight prompt, commercial-size count prompt, report, PDF export, and source-boundary warnings.

This is not an ABYC E-2 compliance determination, DNV cathodic-protection design, NACE or AMPP procedure, marine survey, or corrosion-engineer report. The current-density and amp-hour rows are local placeholders that must be replaced with current standards, product data, hull-potential measurements, bonding checks, salinity, coating condition, stray-current investigation, and qualified marine review before hardware is selected or installed.

The app keeps zinc, aluminum, and magnesium alloy prompts visible because water type, alloy specification, vessel material, shore power exposure, bonding continuity, and anode product data matter. It also warns that fiberglass and wood hull area is not used as current-producing metal area, aluminum hulls need special review, and fresh-water magnesium prompts can create overprotection or coating problems if applied without survey data.

Pro Tip: Use the output as a pre-survey checklist, not a purchase order. Before changing alloy, count, placement, or interval, inspect bonding continuity, look for shore-power or DC stray-current faults, compare actual anode consumption, verify hull potential with an appropriate reference electrode, and check the exact anode product data.

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Sacrificial Anode Weight Calculator
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How It Works

  1. Enter Vessel Metal Prompts

    Enter hull material, local hull-area prompt, shaft dimensions, propeller diameter/count, rudder area, trim-tab area, and the intended service interval. Replace all estimates with measured vessel data before review.

  2. Select Water Type

    Choose salt, brackish, or fresh water so the local worksheet can show the associated placeholder current-density row and alloy prompt. Treat salinity swings and marina conditions as source gaps.

  3. Review Local Current Demand

    Check the component current rows. Fiberglass and wood hull areas remain visible but are ignored as current-producing hull metal; conductive steel and aluminum hull prompts are handled separately.

  4. Carry Warnings Forward

    Use the source warnings, report, and PDF as a checklist for ABYC E-2, DNV or other project standards, exact anode product data, bonding survey, hull-potential readings, stray-current checks, and qualified marine review.

Built For

  • Boatyards collecting source-gap assumptions before seasonal anode review
  • Marine mechanics checking local shaft, propeller, rudder, and trim-tab current prompts before product selection
  • Owners comparing zinc, aluminum, and magnesium rows before asking for a bonding and corrosion survey
  • Corrosion-review teams documenting what must be verified before a vessel or marine-structure CP decision

Features & Capabilities

Local Alloy Capacity Rows

Keeps zinc, aluminum, and magnesium amp-hour-per-pound prompts explicit while warning that exact product chemistry, utilization, mounting, and environment must be verified.

Water-Type Current Prompts

Shows local salt, brackish, and fresh-water current-density rows as placeholders rather than ABYC, DNV, NACE, AMPP, or product-certified values.

Component Current Table

Breaks out hull, shaft, propeller, rudder, and trim-tab current prompts so incorrect conductive-area assumptions are easier to spot.

Source and Safety Warnings

Surfaces source gaps for standards, product data, bonding continuity, salinity, coating condition, shore power, stray current, reference-electrode survey, and qualified review.

Report and PDF Export

Exports the local worksheet and warnings for review notes without claiming final anode selection, placement approval, or marine-survey acceptance.

Frequently Asked Questions

No. The app cites ABYC E-2 as a protected standard boundary and keeps local worksheet assumptions visible. Compliance or vessel acceptance requires the current standard, product data, field measurements, and qualified review.
The app suggests a local alloy prompt from water type, but final alloy choice depends on salinity, vessel materials, coating, shore-power exposure, existing anode performance, product specifications, and survey measurements.
Yes. Overprotection can damage coatings or sensitive materials. The app does not validate hull potential; use a proper reference-electrode survey and qualified corrosion review before adding anode mass.
Low consumption can point to passivation, paint, electrical isolation, broken bonding, low salinity, or a measurement issue. Inspect bonding and anode contact, then verify with product data and field survey results before changing alloy or count.
Disclaimer: This source-aware screen provides local sacrificial-anode worksheet prompts only. It is not ABYC E-2 compliance, DNV design, product certification, bonding validation, hull-potential survey, corrosion-engineer report, marine-surveyor approval, installation instruction, or safe-work authorization.

Learn More

Marine

Marine CP Source-Boundary Anode Guide

Source-boundary guide for sacrificial anode alloy prompts, sizing assumptions, bonding, salinity, product data, ABYC, and survey review gaps.

Read Guide →

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