Calculator accuracy, assumptions, and reliance notice.
Northline Calculators is designed to make common calculations easier to understand, but no page on this site should be treated as a substitute for professional advice or context-specific judgement.
Accuracy and intent
The site aims to produce accurate results within the formulas and assumptions shown on each calculator page.
Where it helps, pages also include interpretation notes, formulas, and limits so the output can be understood rather than accepted blindly.
What calculators cannot cover
Real decisions often depend on factors that a simplified calculator cannot fully model, including contract terms, regulation, site conditions, tolerances, health history, or changing market conditions.
A correct formula can still produce an unsuitable answer if the wrong assumptions or incomplete inputs are used.
Professional review
Financial, legal, medical, engineering, and construction decisions should be reviewed with an appropriately qualified professional when the consequences matter.
This is especially important where errors could affect safety, compliance, health, or significant cost.
Using the site responsibly
Treat calculator outputs as planning tools and reference points. Sense-check the inputs, confirm the assumptions, and review any high-stakes outcome independently.
If you spot a problem on a page, contact hello@northline-calculators.com so the issue can be reviewed.