Grain of TruthWeight planner
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The Grain of Truth Weight Planner

Starts with the science.
Gets more personal as you log.

Explore a weight goal with a forecast that shows uncertainty. As you record weigh-ins, the planner can use your trend to update the estimate.

The band shows a range of possible weight paths, starting with a population-based estimate and becoming more personal as you log.

Open weight planner

For adults 18+. Not for pregnancy, eating-disorder treatment, or use as a replacement for medical supervision.

For loss, maintenance, and gain. Free, no sign-up. Your data stays on your device.

Illustration: a range that gets more personal as weigh-ins are addedIllustration only, not a forecast. A shaded range starts wide on the left and tightens to the right as hollow dots, the weigh-ins, land inside it.
Illustration of learning over time. Not a forecast.

A plan. A forecast. A feedback loop.

  1. Set a goal

    Choose a starting point, a goal, and a timeline. Explore what that plan asks of you.

  2. See a forecast with an honest range

    See a modeled path and its uncertainty, with the assumptions in view.

  3. It adjusts to your real data

    Log your intake and weigh-ins. Review the trend and use your data to refine the forecast.

Your energy needs change. Your model should account for that.

The planner uses a dynamic energy-balance model informed by published Hall/NIDDK research — not the 3,500-calorie-per-pound rule. It accounts for changing energy needs, body composition, glycogen and fluid over time. Projections are estimates, not medical predictions. Grain of Truth is not affiliated with or endorsed by NIH.

Built for loss, maintenance and gain.

Loss

Explore a pace and intake you can review against your progress.

Maintenance

Watch a range and understand drift over time.

Gain

Plan a surplus and follow the trend as your needs change.

Your plan stays with you.

Your plan and logs stay in your browser on your device. Use the planner’s backup export and restore tools to keep a copy or move your data. Clearing browser storage removes the local copy.

Built by a registered dietitian and food scientist.

Geremy Kerr, MS, RDN, built Grain of Truth to connect nutrition science to practical planning, with assumptions and limits left visible.

Meet Geremy

For adults 18+. Not for pregnancy, eating-disorder treatment, or use as a replacement for medical supervision. Projections are estimates; individual care may require a qualified clinician.