Calculations you can inspect before you rely on them
Every calculation on Calcs is built to a standard that lets engineers rely on the result, not hope it is correct.
Three commitments underpin every calculator we build: complete transparency about how it works, and rigorous automated testing before it ships. And a defined protocol when something needs to change.
Read our full quality and transparency promise →01
See every formula, input, and standard reference before you run a number
Every formula, input, and standards reference is visible before an engineer relies on the result. Nothing is a black box.
Open any calculation and you can see the exact formula being applied, the standards clause it came from, and every assumption built into the model. If you disagree with an assumption, you can change it and see what shifts.
- Source formula with clause reference
- All variable definitions and units
- Assumptions clearly labelled
- Pass/fail result with the governing condition named
02
Every result is tested against reference cases before it ships
When you open a calculator, the results have already been checked against known-good reference cases. Not once - every time the calculator changes.
We run automated tests against hand-checked reference cases for every calculator in the library. If a code update, bug fix, or new feature causes a result to shift, the test suite catches it before it reaches production.
03
No calculator with a known error reaches you
Nothing ships until it passes. No calculator reaches production with a known incorrect result.
Our deployment pipeline blocks any release where automated tests fail. Engineers on the Calcs team review changes to calculation logic before they go live. A calculator that produces a wrong answer is not a minor bug. Our process treats it that way.
- Engineering review of calculation logic
- Automated test suite against reference results
- Manual spot-check by a qualified engineer
- Version history preserved after release
Inspect a calculation before you rely on the result
Open any calculator in the library. Inspect the formula, the standard reference, and the assumptions before you run a number.
The verification behind every result
1M+
automated tests across 226 calculators in the library
100%
of calculators tested before shipping
0
silent changes. When a result shifts, engineers who ran that calculator are notified directly.
What customers say
I like that Calcs.com shows the code reference section for each calculation and function. That means every time I use it, there's a potential for me to learn something.
Jim Fanjoy
Project Architect, Brittell Architecture
Every time I use it, it's been a successful day. It just works.
Donovan Rae
Senior Project Manager, Lumos & Associates
The majority of our calculations, unless it's something very odd, are done in Calcs.com.
Nate Powelson
Project Engineer, Criterium Engineers
How we build every calculator
Each calculator follows the same build process before it is made available to engineers.
01
Standards research
We identify the relevant code provisions, interpret the clauses, and document the design scope: what the calculator covers and what it does not.
02
Engineering design
A qualified engineer translates the standard into calculation logic, naming every assumption and documenting where engineering judgment is required.
03
Reference case verification
Results are hand-checked against worked examples from the standards body, peer-reviewed textbooks, or independent software. Discrepancies are resolved before moving forward.
04
Automated test suite
Reference cases are encoded as automated tests. Every future change to the calculator must pass the full suite before deployment.
05
Qualified engineer review
An engineer on the Calcs team reviews the calculation logic, the assumptions, and the test coverage before the calculator goes live.
06
Ongoing maintenance
When a standard is updated or an issue is found, the calculator is reviewed, corrected, and re-tested. Version history is preserved so engineers can see what changed and when.
Critical bug protocol
What happens when we find a calculation error
We hold calculation accuracy to the same standard that structural engineers hold their own work. When we identify a result that is wrong, regardless of how it was found, we follow a defined protocol.
Identify and scope
We determine which calculators and which result paths are affected, and what range of inputs produces an incorrect result.
Notify affected users
Engineers who have used the affected calculator are notified directly. We do not wait for users to discover the issue.
Correct and re-verify
The calculation logic is corrected and re-verified against reference cases. A new set of automated tests is added to prevent recurrence.
Document the change
The correction is documented in the calculator's version history with the date, the nature of the error, and what changed.
Errors in structural calculations carry real consequences. Transparency about how we handle them is part of the quality commitment, not an exception to it.
Questions about calculation quality
How do I know a Calcs calculation is correct?
What happens if Calcs finds an error in a published calculator?
Are Calcs calculators updated when codes and standards change?
What codes and standards do Calcs calculators cover?
Try a calculation. Inspect it before you rely on it.
Start a free trial and open any calculator in the library. Every formula, standard reference, and assumption is visible from day one.