Happy Scales

I'm not sure if this is what you're looking for, but after you input your data it will tell you how much weight it predicts you will lose per week, month and year.

http://scoobysworkshop.com/calorie-calculator/

Weight Tracker QuickLog.me by Genehome
https://appsto.re/us/S-l9F.i
Link to App Store. The "brand" is quicklog.me That website is in a foreign language so I don't know if it links to a google download or not.

Weight loss is just too funky to really have a program that does more than a "tolerable" job of estimating future weight loss. Real rates of loss can't be predicted without looking at averages over several months of time, and by that point you're not talking about the same system (usually a dramatic change in LBM, fat-mass, metabolic state, etc. since the initial data point several months ago) so establishing predictions about the future will be based on faulty assumptions.

How important is it to have a long term plan? If you're determined to find a long term goal that makes sense to aim for, use your current percentage of weekly loss and the following formula. Obviously, initial deficits that include water weight need to be accounted for.

Are you looking for something like this:

Because that's what something purely hypothetical and based on too many assumptions to really be true. The assumptions here are that I can lose the same % of fat mass each week until there is no fat mass left. No matter how you run these numbers, the line is relatively straight until very near your goal. A straight line approximation is certainly acceptably accurate with all the assumptions, error, and confounding factors that come with weight loss. This graph is pretty, but meaningless.

Yeah, I used a simple spreadsheet based on a constant percentage of the excess lost. What's interesting, when I put in my actual trend weights and starting weight (plus my initial rate after about a month), I get the following match for my first year of keto.



I used the following information:

Start weight: 92.5 kg (204 lbs)
Start fat mass: 27.9 kg (61.4 lbs)
Rate of loss: 0.78 kg/week (1.7 lbs/week) -- this was the average rate of loss at week 5
Goal weight: 68.5 kg (151 lbs)

What is interesting is how much this relates to the actual weight loss over the year. I can't continue it from there, I don't have an easy way to get the information into this format. This doesn't really relate to calories or the BMR tables. It's more about the relationship between total fat and the amount lost from it each week.

It was a pretty close relationship. The predicted weight would be 71 kg, I was at 70.7 kg. Of course, taking a different week to the initial rate of loss would give me different results. Take my average rate at week 6 (which was a bump up) and you end up almost 4 kg off by the end. Other weeks give me a full kg/week loss rate, which puts the estimate a couple kg too low. So, really, we have a 10 pound range of error over a year. That's pretty darn good, best we can expect.