The question this resource answers
Compare two entered mass-per-volume percentage numbers while preserving their separate labels. It is written for readers comparing printed percentage numbers, with the focus kept on concentration cards. The aim is a usable record or calculation rather than another generic product-ranking page.
Gather the inputs before interpreting the result
The worksheet asks for: Printed percentage A; Printed percentage B. Keep the relevant package, item reference or source document nearby when completing a field. If the source does not establish a fact, leave it unresolved rather than replacing it with a plausible assumption.
How the working is performed
Subtract percentage A from percentage B to show the percentage-point difference. Divide B by A to show the numeric ratio, provided A is positive.
Work through a concrete case
A comparison of 0.9 and 3 gives 2.1 percentage points and a numeric ratio of about 3.33. That ratio is not a ratio of medical benefit.
What the result cannot establish
Do not infer stronger is better, derive a treatment choice or use this tool as dilution guidance. Review the original item and source before turning a worksheet result into a purchase statement. A calculation can be correct while an input is incomplete, outdated or attached to the wrong product.
Retain a reviewable record
Keep the date, item identity and the source behind any product-specific statement. If you share an output, retain its assumptions and limitations alongside it. Use the interactive tool to reproduce the working rather than presenting an unexplained number or verdict.