# Freeboard Calculator — Free vessel calculator > Calculate current freeboard and the margin to the load line from moulded depth, deck thickness and draft. - URL: https://demo.fcrsoft.com/en/maritime/freeboard-calculator - Language: en - Updated: 2026-10-03 - Publisher: FCRSOFT (https://fcrsoft.com) [Demos](https://demo.fcrsoft.com/?hl=en) / [Free Tools](https://demo.fcrsoft.com/en/tools) / [Maritime Calculators](https://demo.fcrsoft.com/en/maritime) / Freeboard Calculator Free tool # Freeboard Calculator Calculate current freeboard and the margin to the load line from moulded depth, deck thickness and draft. No sign-up needed; results update as you type. [See the system that does this automatically Open the live demo](https://demo.fcrsoft.com/login.php?package=fleet) ## Calculator Moulded depth (D) : 18.3 m Deck plating thickness : 20 mm Mean draft : 12.2 m Minimum summer freeboard : 5.9 m TPC : 58 t/cm This calculator runs in your browser; the data you enter is not stored. ## Results Current freeboard 6.120 m Margin to load line 0.220 m Extra cargo possible with this margin 1,276 t **Keep Your Fleet and Vessel Data in One Place**Result: **6.120**. FCRSOFT stores DWT, TPC and draft data on vessel cards and uses it automatically in voyage estimates. [Open the live demo](https://demo.fcrsoft.com/login.php?package=fleet) [Request a demo](https://fcrsoft.com/en/contact/) ## Freeboard Calculator: worked example Example values: Moulded depth (D) 18.3 m, Deck plating thickness 20 mm, Mean draft 12.2 m, Minimum summer freeboard 5.9 m, TPC 58 t/cm. With these values the results are: | Current freeboard | 6.120 m | | Margin to load line | 0.220 m | | Extra cargo possible with this margin | 1,276 t | ### How to use: Freeboard Calculator - Enter your own values: Moulded depth (D), Deck plating thickness, Mean draft, Minimum summer freeboard, TPC. - Results are calculated as you type: Current freeboard, Margin to load line, Extra cargo possible with this margin. - Check every step of the calculation in the formulas below. ## How is it calculated? - **Current freeboard** = [Moulded depth (D)] + [Deck plating thickness] ÷ 1,000 − [Mean draft] - **Margin to load line** = [Current freeboard] − [Minimum summer freeboard] - **Extra cargo possible with this margin** = max(0; [Margin to load line]) × 100 × [TPC] Ship calculations are estimates based on standard formulas. Loading, stability and draft decisions must be based on the ship’s approved documents and loading computer. ## Other tools running on Vessel Hydrostatics Engine Calculates DWT, displacement, draft, trim, TPC and MCT relationships with standard naval formulas; results must be checked against approved vessel data. - [DWT Calculator](https://demo.fcrsoft.com/en/maritime/dwt-calculator) - [Displacement Calculator](https://demo.fcrsoft.com/en/maritime/displacement-calculator) - [Lightship Weight Calculator](https://demo.fcrsoft.com/en/maritime/lightship-weight-calculator) - [Cargo Capacity Calculator](https://demo.fcrsoft.com/en/maritime/cargo-capacity-calculator) - [Cargo Intake Calculator](https://demo.fcrsoft.com/en/maritime/cargo-intake-calculator) - [DWT Utilization](https://demo.fcrsoft.com/en/maritime/dwt-utilization-calculator) - [Draft Calculator](https://demo.fcrsoft.com/en/maritime/draft-calculator) - [Mean Draft Calculator](https://demo.fcrsoft.com/en/maritime/mean-draft-calculator) - [Forward / Aft Draft Calculator](https://demo.fcrsoft.com/en/maritime/forward-aft-draft-calculator) - [Trim Calculator](https://demo.fcrsoft.com/en/maritime/trim-calculator) - [Trim by Stern (Loading Effect)](https://demo.fcrsoft.com/en/maritime/trim-by-stern-calculator) - [TPC Calculator](https://demo.fcrsoft.com/en/maritime/tpc-calculator) FCRSOFT ## FCRSOFT does this for you automatically You don’t need to do the calculations and checks on this page by hand every day. FCRSOFT derives them all automatically from the records entered in the field. - DWT, TPC, draft and capacity data are stored on vessel cards. - Certificate and document expiry dates are tracked, with warnings before they lapse. - Voyage estimates use vessel data automatically. [Open the live demo](https://demo.fcrsoft.com/login.php?package=fleet) [Explore the Fleet & Vessel package](https://demo.fcrsoft.com/demo/fleet?hl=en) [demo.fcrsoft.com](https://demo.fcrsoft.com/login.php?package=fleet) ## Frequently asked questions How is Freeboard Calculator calculated? Calculate current freeboard and the margin to the load line from moulded depth, deck thickness and draft. The calculation uses Vessel Hydrostatics Engine: Calculates DWT, displacement, draft, trim, TPC and MCT relationships with standard naval formulas; results must be checked against approved vessel data. How is Current freeboard found? Current freeboard = [Moulded depth (D)] + [Deck plating thickness] ÷ 1,000 − [Mean draft]. With the example values (Moulded depth (D) 18.3 m, Deck plating thickness 20 mm, Mean draft 12.2 m, Minimum summer freeboard 5.9 m, TPC 58 t/cm) the result is 6.120 m. How is Extra cargo possible with this margin found? Extra cargo possible with this margin = max(0; [Margin to load line]) × 100 × [TPC]. With the example values (Moulded depth (D) 18.3 m, Deck plating thickness 20 mm, Mean draft 12.2 m, Minimum summer freeboard 5.9 m, TPC 58 t/cm) the result is 1,276 t. Worked example: Freeboard Calculator Example values: Moulded depth (D) 18.3 m, Deck plating thickness 20 mm, Mean draft 12.2 m, Minimum summer freeboard 5.9 m, TPC 58 t/cm. Current freeboard: 6.120 m; Margin to load line: 0.220 m; Extra cargo possible with this margin: 1,276 t. Is Freeboard Calculator free? Yes. The tool is free, needs no sign-up and runs in your browser; the data you enter is not stored. Can FCRSOFT do this calculation automatically? FCRSOFT stores DWT, TPC and draft data on vessel cards and uses it automatically in voyage estimates. You can try the Fleet & Vessel package in the live demo without installing anything. Do the results replace official ship calculations? No. Ship calculations are estimates based on standard formulas. Loading, stability and draft decisions must be based on the ship’s approved documents and loading computer. ## Related tools and guides [Free tool ### Draft Calculator Calculate mean draft from displacement, length, breadth and block coefficient, and the draft increase after loading using TPC. Open the tool](https://demo.fcrsoft.com/en/maritime/draft-calculator) [Free tool ### Cargo Intake Calculator Find the maximum cargo the ship can take and the binding limit from draft restriction, DWT and hold volume. Open the tool](https://demo.fcrsoft.com/en/maritime/cargo-intake-calculator) [Free tool ### TPC Calculator Calculate tonnes per centimetre immersion (TPC) from waterplane area and the cargo matching a given draft change. Open the tool](https://demo.fcrsoft.com/en/maritime/tpc-calculator) [Guide ### What Is DWT (Deadweight)? The relationship between DWT, displacement, lightship weight, draft, TPC and cargo capacity — how to calculate how many tons of cargo a ship can really take. Read the guide](https://demo.fcrsoft.com/en/maritime/what-is-dwt)