I struggled to understand this myself and wish to share the fruits of my labor.
We'll be using the equation found on the
Vo*Ti*4^Po*Q+Vr*Tr*4^Pr*Q
Vo = Total price of item = Base Price
You can determine the Base Price of an item easily by checking the
Vr = Total value of requirements, e.g. if we wanted to sell a Pack of sugar at the 24hr average price according to the Tarkov Market site, we'd use 33,493
Po = Log10(Vo/Vr) [to the power of 1.08 if Vr<Vo], e.g. our Pack of sugar whose Vr would be greater than its Vo would have a Po of -0.307777(Log10(16488.333/33493))
Q = Quantity of item being sold
Ti and Tr = both are tax constants, currently at 0.05
Pr = Log10(Vr/Vo)[to the power of 1.08 if Vr>=Vo], e.g. our Pack of sugar whose Vr would be greater than its VO would have a Po of 0.280089 (Log10(33493/16488.333)^1.08)
Now lets bring it together for selling one Pack of sugar for 33,493 Roubles
16488.333*0.05*4^(Log10(16488.333/33493))*1 + 33493*0.05*4^(Log10(33493/16488.333)^1.08)*1 =
3007 Rouble Fee
In Excel, this could look like: round((A1/A2*4^(log10(A1/A2/A3)^if(A3<(A1/A2),1.08,1))+A3*4^(log10(A3/(A1/A2))^if(A3>(A1/A2),1.08,1)))*.05*A4,0)
A1 = Buyback Price, e.g. 9893
A2 = Trader multiplier for item, e.g. 0.6
A3 = Price you want to list the item for, e.g. 33493
A4 = Quantity to sell, e.g. 1
I hope you guys find this useful. One thing I learned from this is that you should NEVER sell an item for more than 52x it's base price or you will start to actually make less money on the deal due to the exponentially increasing fee. E.g. the Key with tape shouldn't be sold for more than 951600 (18300*52).