First, a bit of a warning to those easily offended by anything negative about Tesla: I've posted several threads about the actual capacities of Tesla battery packs. Raw data with mixed reception. Unfortunately it seems like any time anyone posts a thread that puts Tesla in a negative light most of them tend to get overrun by posts that either aren't on topic or try incessantly to defend Tesla's failing. Bluntly, this thread is not the place for defending Tesla, explaining why they chose to operate as they do, etc. This is about the raw data. Let's gather it, share it, and discuss it logically. If you don't like the data, honestly I don't care. Facts are facts. I don't care if they don't "matter" to you or if you think they don't "matter" to others, and frankly I don't think anyone else cares either. Again, this is about discussing the data and the numbers. Not about how you feel about them. Anyway, sorry about that. The above is my best effort to not have this thread overtaken by nonsense. It's certain to fail, but worth a shot I suppose. To the facts. In a previous thread I posted this data about actual pack capacities after gathering data from multiple cars of each variety: As it turns out, at or near 100% displayed charge the rated miles (not ideal) * the static rated miles value for the vehicle type/config matches the BMS's reported total usable capacity to within about +/- 1 kWh in nearly all cases I've checked on real cars. The disparity is mainly due to lack of significant figures beyond rated miles, the fact that Tesla rounded the rated miles number to a nearest 5 Wh, and the fact that the car seems to round up on reported rated miles. Also, the rated miles display is not refreshed constantly when the BMS value changes, so there is some latency there. Extrapolating from SoC under 100% results in numbers that are very close, but tend to be off due to other factors. In general, what you need to calculate capacity are the exact static rated mile values for your type of configuration. And actually, they're pretty simple. Here they are: All RWD Cars (non-Performance and Performance): 295 Wh/Rated Mile All Pre-refresh Model S Dual Motor, non-Performance: 290 Wh/Rated Mile Refresh Model S Dual Motor, non-Performance under 100 kWh: 285 Wh/Rated Mile Model X Dual Motor, non-Performance under 100 kWh: 320 Wh/Rated Mile Model S Dual Motor, Performance under 100 kWh: 310 Wh/Rated Mile Model X Dual Motor, Performance under 100 kWh: 333 Wh/Rated Mile Model X Dual Motor, Performance 100 kWh: 342 Wh/Rated Mile Quick notes: Rated miles are EPA miles. I'm unsure what systems are used in other parts of the world. Internally on the cars everything in miles and uses these numbers then calculates the values for other regions using these as a base. These are the exact numbers pulled from the Tesla firmware. Rated miles are static Wh/mi. They do not change with driving style or anything else besides the configuration of the car as noted above. The car simply takes the estimated usable energy remaining as reported by the BMS, divides by the appropriate static number above, and displays the value. There is another static value for "ideal" miles, but I haven't bothered to gather it. For example, at my last 100% charge on my X P90D I reached 245 rated miles. To get kWh usable I look at the list above, pick 333 Wh/Rated mile because it matches my car. Then, I take 245 * 333 to get Wh usable. Then divide by 1000 to get kWh. In this example, I end up with 81.6 kWh usable capacity. The BMS on this car reports 81.7 kWh full usable capacity, so pretty darn close. For fun, lets use the EPA range numbers from Tesla's website for some examples. All for sale now are refreshed versions, so keep that in mind. Model S 60 (s/w limited 75): 210 rated miles * 295 Wh/mi = ~62 kWh usable Model S 75: 249 rated miles * 295 Wh/mi = ~73.5 kWh usable Model S 60D (s/w limited 75): 218 rated miles * 285 Wh/mi = ~62.1 kWh usable Model S 75D: 259 rated miles * 285 Wh/mi = ~73.8 kWh usable Model S 90D: 294 rates miles * 285 Wh/mi = ~83.8 kWh usable Model S P100D: 315 rated miles * 314 Wh/mi = ~98.9 kWh usable (* Estimated Wh/mi) Model X 75D: 237 rated miles * 320 Wh/mi = ~75.8 kWh usable Model X 90D: 257 rated miles * 320 Wh/mi = ~82.2 kWh usable Model X P100D: 289 rated miles * 342 Wh/mi = ~98.8 kWh usable As you can see, these numbers actually pretty closely match the capacity values I posted previously. The refresh S 90D appears to make the capacity appear to be a little overrated vs actual capacity, and the X 75D seems to really overstate usable capacity. by over 3 kWh... I'm unsure the reasoning for this. Keep in mind that the rated miles Wh numbers Tesla uses are always rounded to the nearest 5 Wh... which over ~300 miles of rated range is a potential disparity of about +/- 750 Wh before accounting for other factors. A fun extrapolation: A Model S 100D would have a rated range of 337 miles. It's also pretty interesting that given the internal static rated miles values the range numbers on Tesla's website pretty closely match actual usable capacity values. However, if you tried to go by the advertised capacity values (60,75,85,90,100, etc) to come up with a rated miles value you'd end up with something totally different in all cases. After taking the 4 or 2.4 kWh unusable portion into account (for the 85,90,100 or 60,70,75 packs respectively), the only cars still sold where advertised capacity doesn't match actual total capacity appears to be the 90. Previous 85 variants would also fall into this category as well. The 60, 75, and 100 actually appear to have packs of at least their advertised total capacities after taking the unusable portions into account. (Only opinion based portion of this post: On that note, perhaps Tesla is trying to actually match their name plate/advertised capacities on newer car variants. Doesn't really help people who own "85"s and "90"s that are short several kWh vs advertised, but, it's a start.) Anyway, mainly wanted to put out the internal rated miles values so that people can calculate their actual available usable capacities. Should be interesting to see data from more than just the cars I've looked at. -wk Edit: Updated some data for 100 kWh variants.