The Offshore Toolkit is a free, growing set of calculators and checkers for the calculations lifting supervisors, riggers, HSE advisors, and inspectors actually reach for on the job — lifting and rigging, working at height, noise and vibration exposure, asset integrity, and compliance checks like ATEX/IECEx zones. No signup, no paywall, no catch.
Sixteen calculators so far, grouped by what they're actually used for, each one built to answer a specific question you'd otherwise need a standard, a spreadsheet, or a phone call to a colleague to answer.
Safe Working Load from MBL, sling angle de-rating, and tension per leg on a multi-leg sling.
Calculator 01Basic pass/fail checks for padeyes and hooks/shackles against applied load, with side-load warnings.
Calculator 02Diametric reduction, broken-wire counts (6d and single-strand rules), and a physical damage checklist.
Calculator 03Torque from target preload using K × D × F, plus a star-pattern bolt-up sequence diagram.
Calculator 09Estimate capacity at a radius between two published load chart points, with extrapolation blocked.
Calculator 14DROPS Calculator methodology — classifies likely outcome from mass and fall height, with a banded chart.
Calculator 05Free fall, deceleration, harness stretch, and worker height vs. actual clearance available below the work point.
Calculator 10Safe working load per bay against imposed load from people, materials, and equipment.
Calculator 11Weight loss (ASTM G1), penetration rate, and electrochemical (ASTM G102) methods, with MPY/MM-Y/MDD results.
Calculator 07Estimate years to retirement thickness from a corrosion rate, plus a suggested next inspection date.
Calculator 08Estimate anode life from mass and current demand, or anodes needed for a target design life.
Calculator 15A lot of the tools this industry relies on for quick checks — SWL tables, sling angle charts, discard criteria — are locked behind a login, an email capture, or a subscription. The Offshore Toolkit isn't. Every calculator is free to use, right now, with nothing to sign up for and nothing collected.
That's a deliberate choice: a rigger checking a sling angle on deck shouldn't have to create an account first.
Every calculator here is built from the actual formulas and criteria in the standards and industry references it's based on — ISO 4309, DROPS methodology, ATEX/IECEx classification — not rough approximations dressed up as fact.
Where a number genuinely depends on equipment-specific certification or engineering sign-off, the tool says so, rather than pretending more precision than it has. These are working checks to support good judgment on site, not a replacement for a certified lifting plan or a competent person's sign-off.
Yes. Every calculator is free to use, with no signup, no account, and no usage limit. It's built to be a genuinely useful reference for the industry, not a lead magnet.
No. These are working checks and references, not a substitute for a certified lifting plan, manufacturer documentation, or sign-off from a competent person or engineer. Always confirm results against the actual rated equipment, tags, and certificates before any lift.
No. Every calculation runs entirely client-side in your browser. Nothing you type into any calculator is sent to a server, logged, or stored anywhere outside your own device.
Lifting supervisors, riggers, deck crews, HSE advisors, inspectors, and anyone else working offshore or in industrial settings who needs a fast, reliable check — lifting and rigging, working at height, noise and vibration exposure, corrosion and asset integrity, or compliance — without digging through a standard or spreadsheet.