Standards-traceable engineering tools
Engineering calculations you can stand behind.
Run transparent, standards-referenced checks and export professional PDF reports — across one growing engineering toolkit.
- Every calculator free to use
- SI and US customary units
- Free watermarked report previews
lifting-lug · plate lug · SI
Overall status
Governing utilisation 72%
Governing check
Bearing at pin hole
88.7 MPa / 123 MPa
All checks pass within the stated scope.
Bearing at pin hole
Governing
0.72
PassNet section tension
0.41
PassShear at pin hole
0.63
PassFillet weld allowable
Awaiting sourceEvery active check is guarded by a hand-computed benchmark derived from the published clause equations.
Traceable formulas
Every check declares the source it comes from. Anything without a verified basis is labelled, never silently computed.
Transparent assumptions
The assumptions behind a result sit next to the result — in the interface and in the report.
Governing-check clarity
One clear governing result with its utilisation, not a wall of numbers to interpret yourself.
Professional PDF reports
Reports carry inputs, checks, sources, assumptions, scope, and revision metadata — ready for the project file.
The workspace
This is the real tool — not a mock-up.
A live screenshot of the lifting lug calculator: schematic with orthographic views, every check with its source basis, and cross-checks from other methodology families side by side.
xarpis.com/calculators/lifting-lug
Real screenshot of the calculator with an active subscription — every calculator is free to use, full figures unlock with one subscription.
The toolkit
One growing catalogue of in-depth calculators.
Workflow
From inputs to a defensible report, with nothing hidden in between.
- 01
Enter the design basis
Geometry, materials, loads, and design basis — in SI or US customary units, with the units attached to every value.
- 02
Review every check
Each check shows demand, capacity, and utilisation. The governing result is called out, not hidden in a table.
- 03
Inspect sources and scope
Open the source basis, assumptions, and out-of-scope triggers behind any result before you rely on it.
- 04
Export the report
A professional PDF with the full check trail — or share the exact calculation state as a link.
The report
A report another engineer can actually review.
Every export carries the complete check trail: inputs, per-check demand and capacity, the governing result, source references, assumptions, warnings, and revision metadata. Nothing is reduced to an unexplained number.
- Source traceability on every check
- Assumptions and scope stated in full
- Governing check and overall utilisation
- Project, revision, and engine-version metadata
Calculation report
Lifting lug · plate lug
rev A · SI units
engine v1.4.2
Governing: bearing at pin hole
0.72 · Pass
1. Inputs & design basis
geometry · material · loads
2. Checks
demand · capacity · utilisation
3. Sources
code · edition · clause
4. Assumptions & scope
stated in full
Sources: ASME BTH-1 §3-3.3 · EN 1993-1-8 §3.13 · mechanics identities
One subscription
One engineering toolkit. Every calculator included.
Your subscription unlocks full reports across the complete Xarpis catalogue, including new tools as the platform grows. Calculator use and watermarked preview reports stay free for everyone.
$9 for 3 days · then $49 / 4 weeks · cancel any time
Trust, in practice
Built so you can check our work.
- How formulas are sourced
- A check is implemented only when its formula can be traced to a verified basis — a named standard clause supplied for validation, or a public-domain mechanics identity. Until then it is shown as awaiting source, never silently computed.
- How scope is handled
- Each calculator declares out-of-scope triggers. When your configuration falls outside the validated scope, the tool says so — no result is inferred.
- How engines are tested
- Calculation engines are pure functions covered by unit tests, dual-unit invariance checks, and benchmark validation cases run on every change.
- What remains with the engineer
- Xarpis is a preliminary design and verification tool. Responsibility for the design — including whether FEA or independent review is required — remains with the engineer.
- How changes are tracked
- Every report records the engine version that produced it, and methodology pages document the source basis each calculator relies on.
Get started
Spend less time rebuilding calculations. Keep the engineering visible.
Every calculator is free to use. One subscription unlocks full reports across the whole toolkit.