A standard way to value football clubs is to use the Multivariate Model Football Club value = (Revenue + Net Assets) * [(Net Profit + Revenue) / Revenue] * (% stadium filled) / (%wage ratio)
For West Ham this would work out at £600m £252.7m + £56.4m (309.1) x £12.3m+£252.7m (265) = (81,911.5) /252.7m (324.15) * 99.99% (324.1) / 54% = £600m
In comparison other valuations of the Hammers
Daniel Kretinsky share buy in valuation is £625m based on the £168.5m he paid for 27% of West Ham shares.
Football Bench Mark values West Ham at £485m
Sportico values West Ham at £535m
SQAF valuation of West Ham £831m
Forbes Valuation of West Ham £850m
At the end of the day a club is only worth as much as someone is prepared to pay for it. My own estimated range is a valuation of West Ham £800m to £1billion to right buyer at the right time.