Engineering calculations you can stand behind.
Turn engineering logic into clear, reviewable, seal-ready calculation packages in your browser.
One project, one package — every worksheet typeset like this, with tracked units and a record behind every number.
Everything you need to ship a sealed package.
Capabilities you won't find together anywhere else.
AI that explains itself
Black-box software hands you a number and expects trust. Explain walks any block term by term — where the equation comes from, why the check governs — and Askanswers code questions grounded in CalcPackage's verified engineering knowledge base.
Peer review with a paper trail
Spreadsheet review means an emailed copy and a marked-up PDF. CalcPackage runs solo, two-person, and three-person cycles with worksheet-level dispositions and a plain-language audit trail — a workflow for effective and efficient quality management.
Transparent, submittal-ready calcs
A spreadsheet prints its answers and hides its logic in cells. Every CalcPackage sheet shows the equations, the units, and the code references — then exports a PDF under your letterhead. Start from scratch, from CalcPackage-verified templates, or from templates you build for your repeat work.
Textbook-quality math
No cell references, no courier-font echo prints. KaTeX-rendered equations with symbolic form and numeric substitution inline — calcs that read like the textbook you learned from.
Unit intelligence
A spreadsheet doesn't know whether you've mixed inches and feet — it'll just return an incorrect result. CalcPackage's unit-aware engine converts automatically, keeping every calculation dimensionally consistent.
Never transcribe a code equation again.
The CalcPackage equation library puts provisions from AISC, ACI, NDS, and more a click away — rendered, unit-aware, and verified before they ever reach your sheet.
You can manually type this equation into a spreadsheet cell or other calculation software — or insert it from CalcPackage's growing library of verified code equations.
Block types that think like the code.
Design codes are built on logic — conditional provisions, governing cases, load combinations, pass/fail checks. A spreadsheet buries that logic in nested IF() formulas; generic math software doesn't know it exists. CalcPackage gives each pattern a purpose-built block that keeps the logic visible on the sheet.
- ConditionalPiecewise provisions written the way the code writes them — the governing branch highlights itself, with a reference on every branch.
- Governing casemax / min across every candidate, shown in full — with a plain-language note on which case governs and why.
- Load envelopeFactored load combinations expanded and evaluated, with the governing combo called out right on the sheet.
- CheckDemand ≤ capacity with the DCR and a pass/fail pill — rolled up in an automatic summary table of every check in the worksheet.
- Beam diagramLoading, shear, and moment diagrams drawn from the same inputs as the math above them.
A conditional block — §E3 column buckling, exactly as the code writes it.
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Each calculator is the actual editor in public mode. Click anything that gates and we'll explain what Pro unlocks.
Free to explore. One plan to commit.
The public calculators are free forever — no account, no credit card. Full authoring, verification, peer review, and seal-ready export come with one plan.