Weight loss forecast calculator.
Enter your progress so far and get an honest estimate of when you'll reach your goal weight — shown as a range, because weight loss is never a straight line.
Your forecast
Fill in the fields and your estimated goal date will appear here.
This is an estimate, not medical advice or a guarantee. Weight loss slows as you approach your goal, and plateaus are normal — your real timeline may differ.
Honest maths, shown as a range.
Your real pace
We take what you've actually lost and divide by the weeks tracked to find your average weekly rate — your data, not an assumption.
Weight left to go
The distance from your current weight to your goal is divided by that pace to estimate the weeks remaining.
A range, not a date
Because loss slows over time, we widen the estimate into a window rather than a single false-precision date.
Why has my weight loss stalled?
If the scale has stopped moving, you're not doing it wrong — you're hitting a normal part of the process. A few common reasons:
- Smaller body, smaller deficit. As you lose weight you burn fewer calories, so the same diet creates a smaller gap.
- Water and the scale lie short-term. Sodium, hormones and glycogen can mask real fat loss for days or weeks.
- Tracking drift. Portions creep up and logging slips — small amounts add up.
- Muscle gain. Especially when training, the scale can stall while your body composition improves.
What helps
See the trend, not the noise.
A single day's weigh-in is mostly water. WeightLytic models your trend and flags a genuine plateau early — with the data to adjust — instead of leaving you guessing whether one flat week means anything.
Forecast & plateau questions.
How is the weight-loss forecast calculated?
It uses your own progress: how much you have lost so far divided by the number of weeks gives your average weekly rate, and the weight left to your goal is divided by that rate. The result is shown as a range rather than a single date, because real weight loss slows over time.
Why has my weight loss stalled or plateaued?
Plateaus are normal. As you lose weight your body needs fewer calories, so the same diet creates a smaller deficit; water retention, muscle gain, hormones and inconsistent tracking also flatten the scale for days or weeks. A stall usually means your pace has changed, not that progress has stopped — which is why the forecast is a range, not a fixed date.
Is this forecast a guarantee?
No. It is an estimate based on the numbers you enter, presented as a range. It is not medical advice and not a promise of results — everyone responds differently, especially on GLP-1 medications.
Will WeightLytic do this for me automatically?
Yes. At launch WeightLytic forecasts your goal date continuously from your logged weight, food and activity, smooths out daily water-weight swings, and flags plateaus early — so you do not have to do the maths yourself.
Get this automatically at launch.
WeightLytic forecasts your goal date continuously and flags plateaus before they derail you. Launching July 2026.