Alcohol and Weight: Why the Scale Jumps the Morning After
Why the scale often reads higher after a night of drinking, when that is water and when it is not, and how to mark drinking days in your trend curve.
Your weight trend, without the daily noise
Paste your weigh-ins, load an export or try the sample data. You instantly see where your weight is really heading: trend weight, weekly rate and curve, calculated just like in the Trendcurve app.
Your data never leaves your browser
Order and separators don't matter, comma or dot as decimal mark. Several weigh-ins on the same day are averaged.
Drop a file here or
Apple Health (export.zip or export.xml), Withings (weight.csv or ZIP), Google Fit (Takeout CSV), Happy Scale, Libra, openScale, Trendcurve and any CSV with a date and a weight column.
Your result Example data
This is made-up example data covering twelve weeks, so you can see what a result looks like. Paste your own weigh-ins above.
Trend weight
Weekly rate
Typical daily fluctuation
Change in trend
Goal date (projection)
Share as an image
Create an image of your curve for Instagram, WhatsApp and the like. It is made in your browser.
Every day, automatically: Trendcurve for iPhone and Android
The app reads your weight from Apple Health or Health Connect and shows your trend and 7-day change, no copying and pasting. Free, no account, your weigh-ins stay on your device.
All tools
Free, right in your browser, no account. Your numbers are never uploaded.
Why the scale lies (and the trend does not)
Your weight swings by up to two kilos from day to day: water, salt, meals, cycle, sleep. Anyone judging the daily number celebrates coincidence and despairs over coincidence. Trendcurve smooths your readings and shows the line underneath that actually matters.
- Trend weight: the smoothed line through your daily values, method up to you
- 7-day change: today's trend against the trend one week ago
- Weekly rate: the slope of your trend line, the basis of every forecast
A single bad day moves your trend by a few grams. That is exactly the point.
Daily values
Trend
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Articles, tools and terms sorted by topic.
Latest articles
Short, clear answers to common questions about weight, trends and weight loss.
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Medication tracking in Trendcurve sets a marker at every dose change and reminds you on injection day. Learn how to set it up and read the weekly rate.
Every day, automatically: the Trendcurve app
The calculator gives you a snapshot. The app keeps going every day: it reads your weight from Apple Health or Health Connect, smooths it with the same method and shows your trend, 7-day change and history. Free for iPhone and Android, no account needed.
- Weigh in and log Log your weight in seconds with the ruler or the keyboard, or let it be imported automatically from Apple Health or Health Connect. Several readings on one day are averaged into a single daily value.
- Watch the trend Instead of the daily value you look at the trend weight: the smoothed line through your readings, calculated with the method you pick. The 7-day change tells you where things are really heading.
- Steer towards your goal Decide whether you want to lose, gain or maintain, and how fast. Trendcurve turns your rate into a target date, puts planned next to measured and sets milestones along the way.
For iPhone and Android · no account · readings stay on device
Video with sample data
This is what Trendcurve looks like
Five looks inside the app: trend, goal, medication tracking, experiments and everything else.
Everything you need
Log, understand, keep going. Trendcurve brings the tools for that without burying you in numbers.
- Trend weight & 7-day change
- Pick your trend algorithm
- Forecast & target pace
- Maintain with a corridor
- Experiments & markers
- Medication tracking
- Calorie budget from your trend
- Patterns, balance & monthly reports
- Milestones & progress photos
- Sharing for everyone
- Apple Health & Health Connect
- Body measurements & BMI
- Reminders & streak
- Four tabs, each with one job
- Units, widgets & dark mode
Frequently asked questions
Answers to the most important questions about Trendcurve.
Yes. Trendcurve is free on the App Store for iPhone and on Google Play for Android. On Android the app reads and writes weight and body fat through Health Connect. The iCloud backup, widgets and dark mode are only available on iPhone so far. You buy Pro in the store of your device.
Trendcurve has four tabs. Today shows your trend and today's entries, plus your injection day if medication tracking is on. Goal shows the forecast, milestones and, in maintain mode, your corridor. Analysis gathers experiments, patterns, balance, calorie budget, the monthly report and your body values. History lists all measurements. The plus in the middle logs your weight. Drag a card by its handle to change the order in any tab, and choose which cards appear under "Settings & more → Customize cards".
Your weight fluctuates from day to day by up to 1 to 2 kg, due to water, salt or meals. The trend weight smooths these fluctuations and shows where things are really heading. The default is exponential smoothing, where recent readings count for more than older ones; alternatively Trendcurve uses the average of the last 7 or 14 days or double exponential smoothing.
Exponential smoothing is the default and a good compromise between calm and responsive. The 14 day average is the calmest and lags the most, the 7 day average reacts faster but is more restless, and double exponential smoothing also takes the direction into account and bridges gaps. Under "Settings & more → Trend algorithm" each method comes with its pros and cons and today's trend value. You can switch at any time, your readings stay exactly as they are.
The change compares your trend weight today with your trend weight seven days ago. It equals the moving average of the daily change over a week, so you can see at a glance whether you are heading in the right direction.
A straight line is fitted through the trend values of the last 14 days. Its slope is your weekly rate. From that Trendcurve derives when you will reach your goal or the next milestone, assuming things continue as they did over the last two weeks. If your trend barely moves or runs away from the goal, Trendcurve names the reason instead of a date. If you have set a target pace, planned and measured rate sit side by side, together with the days you are ahead of or behind plan.
Height, year of birth and sex give your basal metabolic rate according to Mifflin-St Jeor, and your activity factor or the active energy from Apple Health or Health Connect turns that into your maintenance needs. Your measured weekly rate shows what your balance actually looks like right now, and your target pace gives the budget for the day, calculated with 7,700 kcal per kilogram. All values are estimates and do not replace nutritional advice. The calorie budget is part of Pro.
Enable the import under "Settings & more → Apple Health". Trendcurve then reads all body weight entries from Health: at app start, when returning to the app and regularly in the background, and notifies you about newly imported entries. On top of that you can switch on writing back: manual entries then land in Health, and edits and deletions follow. Body fat and waist run in both directions as soon as you turn those measurements on. On Android this works the same way with Health Connect, there for weight and body fat.
All measurements of a day, whether manual, imported or from Health, are averaged into one daily value. In the history you see this daily value, the trend weight and the change.
Yes. Mark it as ignored in the history: the value stays visible, struck through and with an eye icon, but no longer counts towards the daily value, the trend, the rate, the balance or the monthly report. This works for entries from Apple Health too and can be undone at any time.
Yes. Under "Settings & more → Units" you switch between kilograms, pounds and stones, and between centimetres and feet/inches for height and body measurements. The default follows your region, so pounds in the US and stones in the UK and Ireland. Everything is stored in kilograms internally, so switching only changes how your existing values are displayed.
Logging weight, units, the trend with the algorithm you pick, the 7-day change, history, your target pace, Apple Health or Health Connect, reminders, export and sharing as an image stay free. Creating experiments and markers, medication tracking with dose markers and reminder, and the maintenance corridor with band and status are free as well. Pro unlocks the forecast with target date, the calorie budget, patterns such as plateaus and weekdays, the evaluation of experiments, the trend restart, the weekly rate per dose step, corridor history and early warning, the milestones card, balance, monthly reports, body measurements, progress photos, long chart ranges and, on iPhone, the iCloud backup and the larger widgets. Pro is available as a monthly or yearly subscription and as a one time purchase.
Yes, for free. The share symbol on the "Weight trend" card turns your history into an image, either with weight values or with the change only. Reached milestones can be shared as an image too, and with Pro also the result of an experiment and the before and after comparison of your photos. Every image shows trendcurve.app at the bottom. The ranges 1 year, 3 years and All are part of Pro. Trendcurve itself does not send anything: you choose in the share sheet where the image goes.
Only if you want it to be. By default your readings and health data stay on your device; Trendcurve has no server of its own and no account. Optionally you can enable an automatic backup to your own iCloud account under "Export, backup & import" on iPhone for switching devices. We have no access to it. On Android you take your data with you as a JSON backup. The anonymous usage analytics contain no health values and can be switched off under "Settings & more → Privacy".
Under "Settings & more → Export, backup & import" you can export your weight as CSV or everything as a JSON backup and import both again. With the iCloud backup enabled, Trendcurve offers to restore automatically after a reinstall. CSV exports from Happy Scale, Libra or openScale can be imported too.
A marker records an event such as a holiday, illness or a change of diet in your history. An experiment is a change with a type and a fixed duration, for example four weeks without alcohol. You create both for free under "Settings & more → Experiments and markers", from the "Experiments" card in the Analysis tab or on a day in your history. If you enable "Restart trend" (Pro), the trend calculation starts over on that day: older values no longer pull the trend along, and rate and comparisons begin anew. Your history is fully preserved.
Trendcurve compares the weekly rate of your trend in the 28 days before the start with the rate during the experiment and, once it is over, with up to 28 days after it. Each section needs at least 7 days and 4 days with a measurement. If something is missing, the card tells you how many measurements and days are still needed. When an experiment is finished, Trendcurve shows the result, which you can share as an image. For experiments about medication or dose, the image only says "Experiment" instead of the label. The numbers show a connection in time, not a cause. The evaluation is part of Trendcurve Pro, creating experiments is free.
If you are on a weekly medication, for example a GLP-1 therapy, turn it on under "Settings & more → Medication tracking". Trendcurve then adds every dose change as a marker to your history and reminds you on your injection day; you check off the week with one tap. With Pro the "Dose steps" card shows how your trend moved in each step. Label, dose and checked-off days stay on your device and in your own backups. They never appear in notifications or on shared images. Trendcurve gives no recommendations and is not a medical device. Your doctor decides on dose and intake.
In maintain mode a corridor surrounds your goal weight. You set its width yourself, as a percentage of your goal or as a fixed amount. It is your setting, not a recommendation. When your trend reaches the goal, Trendcurve offers the corridor; you can also switch to "Maintain" at any time under "Settings & more → Goal". The band in the chart and the status are free. With Pro you see how long your trend has been inside the corridor and get an early warning when it leaves the corridor or would leave it soon at the current weekly rate.
Shots from the camera or your library, stored with the date and your trend weight. Any two of them can be put side by side as a before and after comparison and shared as an image. The photos stay locally on your device and are included in the JSON export. Progress photos are part of Pro.
Yes, optionally. Under "Settings & more → Body measurements" you choose which measurements you want to record. Each one gets its own history with trend and comparison; from waist and hip Trendcurve also calculates the waist to hip ratio. Body fat and waist can be exchanged with Apple Health, and on Android body fat with Health Connect, and a weekly reminder at a day and time you choose skips itself when you have just measured. Weight remains the core of the app.
On iPhone, yes. Press and hold the home or lock screen, tap "+" and search for Trendcurve. There are small and medium home widgets with trend, 7-day change, streak and a mini chart, as well as lock screen widgets. A tap opens the app. There are no widgets on Android so far.
Open the Customer Center under "Settings & more → Manage subscription & purchases". There you can see your subscription, change or cancel it and restore earlier purchases. Billing runs through the App Store or Google Play. If you bought Pro as a one time purchase, it stays active permanently.
See where things are really heading
Download Trendcurve for free for iPhone or Android and turn a number that jumps every day into a line you can trust.