Engineering Calculators
Free interactive tools for structural analysis, fatigue assessment, and engineering calculations. Based on industry standards.
Drilling Rig Selector NEW
Shortlist offshore drilling rigs by the numbers that decide selection: water depth rating, hookload, moonpool envelope, jackup leg length and cantilever reach. Sortable table with a provenance link to every rig's published specification sheet.
On-Bottom Stability Calculator NEW
Calculate on-bottom stability for subsea pipelines using DNV-RP-F109. Includes hydrodynamic drag, inertia, and lift forces, submerged weight calculation with coating and contents, and lateral stability utilisation ratio with interactive velocity sweep visualization.
Pipeline Wall Thickness Calculator NEW
Calculate minimum wall thickness and verify burst and collapse resistance for pipelines per ASME B31.4. Includes Barlow formula burst check with corrosion allowance, elastic collapse check, and minimum wall thickness calculation with interactive visualization.
Mooring Line Fatigue Calculator NEW
Single-stress-range fatigue screen for mooring chain using the DNV-OS-E301 T-N curve. Converts a tension range to nominal stress, computes cycles to failure (N = a_D · S^-m), annual damage, and fatigue life for studless or studlink chain, with an interactive tension-range sweep.
Decline Curve & EUR Calculator NEW
Forecast production and estimate ultimate recovery (EUR) with the Arps decline equations. Closed-form cumulative production to an economic limit or fixed horizon, time-to-limit, explicit per-day/per-year unit handling, and an interactive rate-vs-time forecast chart.
S-N Curve Fatigue Calculator NEW
Calculate fatigue life using 40+ S-N curve classes from four major standards. Interactive Plotly visualization, multiple environments (air/seawater), SCF support, and real-time damage calculation. Our most comprehensive fatigue tool.
NPV Field Development Calculator NEW
Calculate net present value (NPV), internal rate of return (IRR), and payback period for field development projects. Features production decline modeling, price escalation, tax/royalty calculations, and interactive cashflow visualization with Plotly.
Basic Fatigue Life Calculator
Simple fatigue life calculator for welded steel joints using DNV S-N curves. Quick estimates for preliminary fatigue assessments. For more comprehensive analysis with multiple standards and interactive plotting, use the S-N Curve Calculator above.
About These Calculators
These calculators are provided as educational tools for preliminary engineering estimates. They implement industry-standard methods from recognized codes and standards including:
- DNV-RP-F109: On-Bottom Stability Design of Submarine Pipelines
- ASME B31.4: Pipeline Transportation Systems for Liquids and Slurries
- DNV-RP-C203: Fatigue Design of Offshore Steel Structures
- API RP 2A: Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms
- BS 7608: Code of Practice for Fatigue Design and Assessment of Steel Structures
- ASME BPVC: Boiler and Pressure Vessel Code
Need More Advanced Analysis?
For complex fatigue assessments, FEA-based stress analysis, or advanced engineering solutions, we offer professional consulting services with validated methodologies.