Chair Offers COVID-19 Compensation... But Asks ME to Put Out a Number The chair of my department has very generously offered to try and secure funding for some of the part-time and adjunct professors working in the department as compensation for adapting our originally in-person courses to an online format (this is in response to the global COVID-19 pandemic).  I currently am an adjunct only teaching one upper-division class at this institution.  The catch here is that my chair has asked me and the other part-timers to throw out numbers that we feel are appropriate.  I really have no intuition about what to ask for, or to simply respond (graciously) saying that I trust my chair's judgement and allow them to come up with a number for me/us.  I don't want to come off as greedy and pick a number they might claim to be inappropriate, but at the same time I feel that it's rather passive to blindly let my chair pick.

For reference, I'm a fairly new hire in this department and not really clear about my future there.  The chair and the other faculty are very friendly and inviting, so I'm not particularly worried about setting off any personality conflicts.  Just not sure what the appropriate response is here.
There are really two parts to the Chair's question:


How much additional work have you had to do so far? What additional work do you anticipate going forward? Are there any time savings that should also go into the calculation?
What is the appropriate renumeration for that work?


You should be able to estimate the answer to (1), and explain where the number comes from. You should certainly include this information in your response to the chair. Then, as in the answer by @Allure, you can propose that they pay you for the additional time at (broadly) the same rate as you usually expect to get. For example,


  Hello,
  
  I estimate that I've had to spend 80 hours preparing new material, and
  there will be an additional 4 hours work each week going forward.
  However, I'm saving an hour on travelling between campuses. Assuming
  this continues for the next 12 weeks, we're looking at something like
  120 hours additional work. I think my usual salary works out at around
  $30/hour.
  
  Thanks, 
  Mndifldz


Note that all you have done here is state facts, so there is nothing anyone can criticise you for. You leave it up to the chair to do the maths, and decide what they can afford to offer. However, you lead them towards a number that (hopefully) you think is fair.