Well... everything depends on your experience using Webflow. After over 2 years of using it + my Webflow Plugins experience I have my rate set at $80/h which is a lot. On the other hand I can do things much faster than most people + I add some nice self-written plugins to Webflow Project to make it even more dynamic and outstanding.
The price for a project can vary from as little as $400 for a very simple website up to $10.000 for a complex one + maintenance + custom scripting or even conversion to CMS! Usually, I try to think how many hours do I need to make a specific website and depends on the amount of work and the final price I give a discount for entire project or not. So let's say...
Let's say my client wants to have a website that I know will need around 15h of my work (this is just a desktop version, remember!). I multiply
15h*$80 which gives me $1.200 for a desktop version. Then I think if I need to add some additional scripts (custom, self-written or implementation of libraries) and let's say my client wants to have 3 scripts for which I need 3h for implementation. That gives me another
$240. Now after the desktop version is calculated let's write it down:
Website = $1200
Custom Scripts = $240
Responsiveness = +25%
I add responsiveness after everything because libraries mostly need to be responsive to different screen sizes as well. So the total gives me $1.800.
Now I know, that clients like to negotiate terms and price so I have a nice buffer of
+-15%. People like discounts
;) But don't push the price down too quick! Try to win an argument maybe by lowering the price but tell about hosting website on your webflow account. Maybe your client doesn't want to deal with different hosting service? If you lower your price by 10% then say that you can even lower by 15% if they host it on your side + maintenance + 1h each month of fixes/changes for another $16/month.
Above is just a scenario that I came up from my head. Don't blindly follow that but try to find your own way to start
;) For starters I'd suggest having a lower fixed price for a project but a hard value for small few-hours fixes.
:) Catch me at Skype if you need more advices!