[mrtg-developers] Percentage calculation in graph legends

S Shipway s.shipway at auckland.ac.nz
Wed Dec 30 21:41:58 CET 2009

Can you tell use (a) which software you are using (eg, Native MRTG, Routers2, 14all, etc...) and what version, and also what version of RRDTool (if you are using RRD)?

It is possible that the percentage is being calculated on the max of the AVG RRA for the month, rather than the max of the MAX RRA.


From: nisha [via MRTG Mailinglists] [mailto:ml-node+4231659-1307958137 at n2.nabble.com]
Sent: Wednesday, 30 December 2009 11:08 p.m.
To: Steve Shipway
Subject: [mrtg-developers] Percentage calculation in graph legends

Hi All,

The graph legend display the percentage in parenthesis as shown in the figure.


The current and average legends show the exact value and percentage. But in case of the Maximal legend, though the value is 23.937, the percentage is calculated as 23.04% instead of 23.94% [(23.937/100)*100].

As per my understanding the percentage is always calculated as [(value/max bytes) * 100 ]. In this case the maxbytes value is 100.
Is the percentage calculation different for current, average and maximal values?

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