The Workout Weight Estimator projects future body weight from a starting weight and an expected average weekly change. It is designed for training plans in which calorie intake and activity are expected to create a gradual gain or loss.
The projection is linear and does not predict water shifts, plateaus, or metabolic adaptation. Use it to set checkpoints and compare actual progress with a simple plan, then update the weekly rate when real measurements diverge.
Enter the baseline value used for the projection.
Use a negative number for loss or a positive number for gain.
Enter how many weeks the plan will run.
Recalculate with your observed average rate as new data becomes available.
This is a straight-line projection with a constant weekly rate.
The result is the body weight implied by the entered average weekly change.
Short-term scale changes often reflect water and glycogen rather than tissue change.
Given: 80 kg, −0.5 kg per week, 12 weeks.
Calculation: 80 + (−0.5 × 12) = 74 kg.
Result: Projected weight is 74.0 kg.
Daily weight fluctuates. A weekly trend better represents sustained change.
Yes. Enter a positive weekly change for a gaining phase.
Replace the planned rate with the recent observed rate and create a new projection.
No. Scale change can include fat, muscle, water, glycogen, and digestive contents.
Updating every few weeks is usually more informative than reacting to a single weigh-in.