Wondered how long it would take for you to pose this question
Bringing up an old thread that never really reached any significant conclusion about defining a "big" club showed how subjective this is.
Re-reading this thread its clear (to me) that we are talking about two distinct things here;
a) SUCCESSFUL clubs: any club whether its big or not can achieve success (e.g. Wimbledon winning the FA Cup, Forest winning the European Cup twice). Winning something doesn't make you a BIG club. However, SUCCESS can be measured - the record books show that these clubs are successful. HOWEVER, continued success in my view will lead to becoming a big club as that company brand attains worldwide growth.

BIG clubs: Stature, support, history, money (turnover), brand name... this is a more subjective subject. WHAT is a big club? I'd suggest brand name!
Before we can say whether Newcastle are a big club define the measure you wish to apply and then we can discuss. In my view, whichever criteria you wish to apply I'm confident that it will be easy to argue that the Toon are a big club.
Thinking globally if you were asked to name a big club, what would you answer? Are they in this list? If not, why not and how can they think of themselves as big if they're not...
Rank (Prior year) Club Income (In millions)
1 (1) Manchester United €259.0
2 (4) Real Madrid 236.0
3 (3) AC Milan 222.3
4 (10) Chelsea 217.0
5 (2) Juventus 215.0
6 (7) Arsenal 173.6
7 (13) Barcelona 169.2
8 (6) Internazionale 166.5
9 (5) Bayern Munich 166.3
10 (8) Liverpool 139.5
11 (9) Newcastle United 136.6
12 (11) AS Roma 108.8
13 (18) Celtic 104.2
14 (16) Tottenham Hotspur 100.1
15 (15) SS Lazio 99.4
16 (n/a) Manchester City 93.5
17 (14) Schalke 04 91.4
18 (n/a) Olympique Marseille 88.0
19 (n/a) Rangers 86.2
20 (n/a) Aston Villa 84.4
Source: Deloitte Football Money League (03/04 season)
Did anyone think of a "BIG" club that isn't listed? Name them and we'll discuss whether they can be classed as such