Maintenance range
TDEE Calculator
Get a maintenance-calorie range instead of a single overconfident number, plus an adaptive estimate from your own data.
Estimate your TDEE →FREE TOOLS
Understand the pattern before you track it.
Start with your TDEE, see your timeline, then watch your real trend. These small, private tools make Trendline’s core ideas visible—your inputs stay in this browser tab and are not uploaded.
Runs in your browser — nothing uploaded. No signup, no ads.
Trend and rate
Weight Trend Calculator
Paste your own weigh-ins and see the underlying trend through the daily noise.
See your trend →Muscle for your frame
FFMI Calculator
See how much muscle you carry for your height — as a range that shows what a body-fat measurement error actually does to it.
Work out your FFMI →Arrival window
Goal Timeline
Turn a goal weight into a realistic arrival window and a plausible band, with a maintenance handoff most tools forget.
Plan a timeline →These instruments follow the same rules as the app — deterministic math, uncertainty stated plainly, nothing uploaded. Read the methodology →