46 CFR § 69.65 - Calculation of volumes.

---
identifier: "/us/cfr/t46/s69.65"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 69.65 - Calculation of volumes."
title_number: 46
title_name: "Shipping"
section_number: "69.65"
section_name: "Calculation of volumes."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "G"
subchapter_name: "DOCUMENTATION AND MEASUREMENT OF VESSELS"
part_number: "69"
part_name: "MEASUREMENT OF VESSELS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 2301, 14103, 14104; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 87-015b, 54 FR 37657, Sept. 12, 1989, unless otherwise noted."
cfr_part: "69"
---


# 69.65 Calculation of volumes.

(a) Volumes V and V<sub>c</sub> used in calculating gross tonnage ITC and net tonnage ITC, respectively, must be measured and calculated according to accepted naval architectural practices for the spaces concerned.

(b) Measurements must be taken, regardless of the fitting of insulation or the like, to the inner side of the shell or structural boundary plating in vessels constructed of metal, and to the outer surface of the shell or to the inner side of structural boundary surfaces in all other vessels.

[USCG-2011-0522, 81 FR 18722, Mar. 31, 2016]