# Mean Draft Calculator — Free vessel calculator > Calculate mean draft, sag/hog effect and quarter mean from forward, aft and midship draft readings. - URL: https://demo.fcrsoft.com/en/maritime/mean-draft-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) / Mean Draft Calculator Free tool # Mean Draft Calculator Calculate mean draft, sag/hog effect and quarter mean from forward, aft and midship draft readings. 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 Forward draft : 11.8 m Aft draft : 12.6 m Midship draft : 12.25 m This calculator runs in your browser; the data you enter is not stored. ## Results Forward-aft mean 12.200 m Quarter mean 12.238 m Sag (+) / hog (−) 5.0 cm Trim (by the stern) 0.80 m **Keep Your Fleet and Vessel Data in One Place**Result: **12.238**. 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/) ## Mean Draft Calculator: worked example Example values: Forward draft 11.8 m, Aft draft 12.6 m, Midship draft 12.25 m. With these values the results are: | Forward-aft mean | 12.200 m | | Quarter mean | 12.238 m | | Sag (+) / hog (−) | 5.0 cm | | Trim (by the stern) | 0.80 m | ### How to use: Mean Draft Calculator - Enter your own values: Forward draft, Aft draft, Midship draft. - Results are calculated as you type: Forward-aft mean, Quarter mean, Sag (+) / hog (−), Trim (by the stern). - Check every step of the calculation in the formulas below. ## How is it calculated? - **Forward-aft mean** = ([Forward draft] + [Aft draft]) ÷ 2 - **Quarter mean** = ([Forward draft] + 6 × [Midship draft] + [Aft draft]) ÷ 8 - **Sag (+) / hog (−)** = ([Midship draft] − ([Forward draft] + [Aft draft]) ÷ 2) × 100 - **Trim (by the stern)** = [Aft draft] − [Forward draft] 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) - [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) - [Freeboard Calculator](https://demo.fcrsoft.com/en/maritime/freeboard-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 Mean Draft Calculator calculated? Calculate mean draft, sag/hog effect and quarter mean from forward, aft and midship draft readings. 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 Quarter mean found? Quarter mean = ([Forward draft] + 6 × [Midship draft] + [Aft draft]) ÷ 8. With the example values (Forward draft 11.8 m, Aft draft 12.6 m, Midship draft 12.25 m) the result is 12.238 m. Worked example: Mean Draft Calculator Example values: Forward draft 11.8 m, Aft draft 12.6 m, Midship draft 12.25 m. Forward-aft mean: 12.200 m; Quarter mean: 12.238 m; Sag (+) / hog (−): 5.0 cm; Trim (by the stern): 0.80 m. Is Mean Draft 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 ### Forward / Aft Draft Calculator Calculate forward and aft drafts from true mean draft at the LCF and trim. Open the tool](https://demo.fcrsoft.com/en/maritime/forward-aft-draft-calculator) [Free tool ### Trim Calculator Calculate trim, trim angle and trim direction from forward and aft drafts. Open the tool](https://demo.fcrsoft.com/en/maritime/trim-calculator) [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) [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)