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What Is TrendWeight, Exactly?

When you really want to track your weight loss, you probably know you should disregard day to day changes in weight and instead focus on the trend over time. To do this, TrendWeight uses the methodology described by John Walker in his online book, The Hacker's Diet.

The idea is pretty simple. You weigh yourself each day on either a FitBit Aria Scale or a Withings WiFi Scale, and TrendWeight will plot a moving average from your daily weight alongside your daily scale weight. This gives you a better idea of your weight trend by masking most of the day to day noise that variances in water weight introduce. Your dashboard will also calculate some statistics that will help you fine tune how much you are eating so that you hit your desired rate of weight loss.

See It In Action: Sample Dashboard

And once you reach your goal, keep weighing yourself every day. TrendWeight will show a goal range that is 2.5 pounds above and below your goal weight so that you can more easily see if your weight starts to creep up too high and you need to go back to the techniques that helped you lose weight in the first place.

Help / Resources

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Questions/Feedback?
Send an email to support@trendweight.com
Donations? Go here

Frequently Asked Questions

Do I have to have a FitBit or Withings scale to use this site? Can I manually enter my weight data instead?

You'll have the best experience if you have to have either a FitBit or a Withings scale. If you don't have one and would like to buy one, the easiest way to get one is on Amazon: FitBit Aria or Withings Body Scale. They are both easy to setup. They measures both weight and body fat. And they can be used by everyone in your household.

If you don't have a scale, you can do things manually by creating a FitBit account and hand entering your weight there every day. Go ahead and connect your TrendWeight account to your FitBit account as if you had a scale. TrendWeight won't know that your weight readings were entered manually.

Is there an iOS or Android App for TrendWeight?

No, there are not native applications for smartphones (iOS/Android/Windows/etc), and I don't have any plans to develop apps. That said, the TrendWeight web app is reasonably optimized for smartphones If you visit TrendWeight.com on your iOS or Android device, you'll see an phone-optimized view of your dashboard.

How do I switch from a Withings Scale to a FitBit Aria Scale (or vice versa)?

You need to disconnect from your current scale and then you'll be able to connect to a new, difference scale. First, go to your settings page. At the bottom of your settings page you'll see an option to disconnect you current scale. Click it. Next, go back to your dashboard and you'll be asked to connect a new scale to your account.

Why aren't all of my past weight readings appearing in TrendWeight?

TrendWeight will retrieve all of the weight readings from your WiFi scale that happened on or after the Start Date listed on your settings page. You can adjust your start date to make more (or fewer) days of your weight data appear in TrendWeight. Choose an earlier start date and more data will be included.

What mathmatical analysis is being used to calculate my trend weight?

The techiques used on TrendWeight come from John Walker's The Hacker's Diet. I found it to be an interesting read (and it's free!). In particular, I recommend reading the "Signal and Noise" chapter for a better understanding of the weight tracking methodology used on this site.

Can I use this outside the U.S.?

Yes! TrendWeight now supports weights in kilograms in addition to pounds. That said, the site is only available in English. So as long as you're ok with that limitation, you're welcome to use it.

What happens if I weight myself multiple times in one day?

TrendWeight will only use one weigh-in per day. Currently, the first weigh-in of the day is used. This is usually most appropriate if your habit is to step on the scale first thing in the morning after you wake up. There may be an option to configure this behavior in a future update. If your first weigh-in of the day is incorrect for some reason and you don't want TrendWeight to use that data, you can log into the FitBit or Withings website and edit or delete that incorrect data point and TrendWeight will use the corrected data.

Can I use share my weight trend charts and stats with others?

Yep! Losing weight is hard, and sharing your progress with the people who support you can help improve your odds of success. Each user gets a private URL that can be given to friends and family. That URL will allow anyone to see your trend graphs and statistics (so only give it to people you want to see your charts and stats). Go to your Settings page to find your private URL. You can also change your private URL at any time in case you gave your URL to someone and later decide you don't want them to see your stats anymore.

Is there some way I can help support TrendWeight?

TrendWeight is an app that I created in my free time out of a passion for tech gadgets and software development (and because I wanted this functionality for myself). TrendWeight is free, but if you'd like to know how to help support TrendWeight, you can read more here.

I have a question you didn't answer or a suggestion for a new feature!

No problem. If you have a question that you don't see answered here, feel free to email support@trendweight.com. If you have a suggestion for how TrendWeight could be better, you can also email me at support@trendweight.com or you can post your suggestion here.