🚢 Draft Survey Calculator
Perform Initial, Intermediate, and Final draft surveys with precision. Calculate displacement, constant, and cargo loaded using standard maritime formulas.
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Select Survey Mode
Survey Results
Final Displacement
0.00 MT
Actual Constant
0.00 MT
Maritime Calculator
Draft Survey Report / Certificate
Generated: 3 February 2026
https://maritimecalc.com/
Mode: INITIAL
Vessel:
Date: 2/3/2026
LBP: 0.00 m
Lightship: 0.00 MT
LBDM: 0.00 m
Dock Density: 1.0250 kg/L
Observed Drafts
| Location | Port (m) | Starboard (m) | Mean (m) |
|---|---|---|---|
| Forward | 0.0000 | 0.0000 | 0.0000 |
| Midship | 0.0000 | 0.0000 | 0.0000 |
| Aft | 0.0000 | 0.0000 | 0.0000 |
Draft Corrections & True Drafts at Perpendiculars
| Keel Correction | 0.000 m |
| Fwd Correction Factor | 0.000 m |
| Mid Correction Factor | 0.000 m |
| Aft Correction Factor | 0.000 m |
| Forward Draft Correction | 0.0000 m |
| True Draft @ Fwd Perp. | 0.0000 m |
| Midship Draft Correction | 0.0000 m |
| True Draft @ Midship | 0.0000 m |
| Aft Draft Correction | 0.0000 m |
| True Draft @ Aft Perp. | 0.0000 m |
Trim & Mean Draft Calculations
| Apparent Trim | 0.0000 EVEN KEEL |
| True Trim | 0.0000 m |
| Mean Draft @ Perp. | 0.0000 m |
| Mean of Mean (MoM) | 0.0000 m |
| Quarter Mean (QM) | 0.000000 m |
Displacement Calculations (Metric Tonnes)
| Tabular QM Draft | 0.00 m |
| Tabular Displacement | 0.00 MT |
| TPC (Tons per cm) | 0.00 T/cm |
| LCF (Long. Center of Flotation) | 0.00 m |
| MTC1 (QM + 0.50m) | 0.00 TM/cm |
| MTC2 (QM - 0.50m) | 0.00 TM/cm |
| QM Draft Increment | 0.000000 m |
| Displacement Increment | 0.00 MT |
| Total Displacement @ QM | 0.00 MT |
| 1st Trim Correction | +0.00 MT |
| 2nd Trim Correction | +0.00 MT |
| Displacement Corrected for Trim | 0.00 MT |
| Observed Density | 1.0250 kg/L |
| Standard Density | 1.025 kg/L |
| FINAL DISPLACEMENT | 0.00 MT |
Deductible Weights (Remaining on Board)
| Fuel Oil (FO) | 0.00 MT |
| Diesel Oil (DO) | 0.00 MT |
| Lube Oil (LO) | 0.00 MT |
| Ballast Water | 0.00 MT |
| Fresh Water (FW) | 0.00 MT |
| Others | 0.00 MT |
TOTAL DEDUCTIBLES0.00 MT
Final Summary
Final Displacement0.00 MT
Lightship Weight- 0.00 MT
Ship's Deadweight0.00 MT
Deadweight0.00 MT
Total Deductibles- 0.00 MT
Actual Constant0.00 MT
Chief Officer
Date: _______________
Surveyor
Date: _______________
Generated by Maritime Calculator - https://maritimecalc.com/
This report is generated for reference purposes only. Verify all calculations independently.
Detailed Calculations
Forward
Port0.0000 m
Starboard0.0000 m
Mean0.0000 m
Midship
Port0.0000 m
Starboard0.0000 m
Mean0.0000 m
Aft
Port0.0000 m
Starboard0.0000 m
Mean0.0000 m
Correction Factors
Keel Correction0.000 m
Forward Correction Factor0.000 m
Midship Correction Factor0.000 m
Aft Correction Factor0.000 m
Forward Perpendicular
Draft Correction0.0000 m
True Draft @ Fwd P0.0000 m
Midship
Draft Correction0.0000 m
True Draft @ Midship0.0000 m
Aft Perpendicular
Draft Correction0.0000 m
True Draft @ Aft P0.0000 m
Apparent Trim0.0000 EVEN KEEL
True Trim0.0000 m
Mean Draft @ Perpendiculars0.0000 m
Mean of Mean (MoM)0.0000 m
Quarter Mean (QM)0.000000 m
From Hydrostatic Tables
Tabular QM Draft0.00 m
Tabular Displacement0.00 MT
TPC (Tons per cm)0.00 T/cm
LCF (Longitudinal Center of Flotation)0.00 m
MTC1 (QM + 0.50m)0.00 TM/cm
MTC2 (QM - 0.50m)0.00 TM/cm
Calculated Values
QM Draft Increment0.000000 m
Displacement Increment0.00 MT
Total Displacement @ QM0.00 MT
Total Displacement @ QM0.00 MT
Trim Corrections
1st Trim Correction0.00 MT
2nd Trim Correction+0.00 MT
Displacement Corrected for Trim0.00 MT
Density Correction
Observed Density1.0250 kg/L
Standard Density1.025 kg/L
Final Displacement (Corrected for Density)0.00 MT
Fuel Oil (FO)0.00 MT
Diesel Oil (DO)0.00 MT
Lube Oil (LO)0.00 MT
Ballast Water0.00 MT
Fresh Water (FW)0.00 MT
Others0.00 MT
Total Deductibles0.00 MT
Ship Particulars
Length Between Perpendiculars (LBP)0.000 m
Length Between Draft Marks (LBDM)0.000 m
Lightship Weight0.00 MT
Final Displacement0.00 MT
Lightship Weight- 0.00 MT
Ship's Deadweight0.00 MT
Total Deductibles- 0.00 MT
ACTUAL CONSTANT0.00 MT
⚙️ How to Use
Step 1: Mode & Particulars
- Select Initial, Intermediate, or Final survey mode.
- Enter the Vessel Name, LBP, and Lightship.
- These values are critical for accurate trim corrections.
Step 2: Draft Readings
- Input the 6 draft readings (Port/Stbd for Fwd, Mid, Aft).
- The calculator will auto-compute the Quarter Mean Draft.
Step 3: Hydrostatics
- Look up the Quarter Mean Draft in your ship's stability book.
- Obtain Displacement, TPC, LCF, and MTC values.
- Enter them in the Hydrostatic Data section.
Note: Ensure you use the correct signs for corrections if manually adjusting. The calculator handles standard algebraic signs automatically.