Product
Fleet & Vessel
10 vessels; certificate/survey tracking and bunker stems included
- 10 full users
- 1 sites
- 3 modules
Free tool
Deadweight Scale
Calculate displacement and DWT at an observed draft by linear interpolation between light and summer conditions. No sign-up needed; results update as you type.
See the system that does this automaticallyOpen the live demoDeadweight Scale: worked example
Example values: Lightship draft 3.2 m, Lightship weight 10,500 t, Summer draft 13 m, Summer displacement 67,900 t, Observed draft 10.4 m. With these values the results are:
| Average TPC | 58.57 t/cm |
|---|---|
| Displacement at this draft | 52,671 t |
| DWT at this draft | 42,171 t |
| Remaining to summer draft | 15,229 t |
How to use: Deadweight Scale
- Enter your own values: Lightship draft, Lightship weight, Summer draft, Summer displacement, Observed draft.
- Results are calculated as you type: Average TPC, Displacement at this draft, DWT at this draft, Remaining to summer draft.
- Check every step of the calculation in the formulas below.
How is it calculated?
- Average TPC = ([Summer displacement] − [Lightship weight]) ÷ (([Summer draft] − [Lightship draft]) × 100)
- Displacement at this draft = [Lightship weight] + ([Observed draft] − [Lightship draft]) × 100 × [Average TPC]
- DWT at this draft = [Displacement at this draft] − [Lightship weight]
- Remaining to summer draft = [Summer displacement] − [Displacement at this 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.
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.
Frequently asked questions
How is Deadweight Scale calculated?
Calculate displacement and DWT at an observed draft by linear interpolation between light and summer conditions. 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 DWT at this draft found?
DWT at this draft = [Displacement at this draft] − [Lightship weight]. With the example values (Lightship draft 3.2 m, Lightship weight 10,500 t, Summer draft 13 m, Summer displacement 67,900 t, Observed draft 10.4 m) the result is 42,171 t.
Worked example: Deadweight Scale
Example values: Lightship draft 3.2 m, Lightship weight 10,500 t, Summer draft 13 m, Summer displacement 67,900 t, Observed draft 10.4 m. Average TPC: 58.57 t/cm; Displacement at this draft: 52,671 t; DWT at this draft: 42,171 t; Remaining to summer draft: 15,229 t.
Is Deadweight Scale 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.
FCRSOFT solutions
All inclusive
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- 30 full users
- 1 sites
- 69 modules
