How to read the result
Turn a top set into useful backoff volume. The notes below show the assumptions behind that recommendation.
Backoff Set Calculator
Turn a top set into useful backoff volume. Enter the top set. Get rounded backoff sets that keep volume hard enough to matter without turning every set into a grinder.
Log the set in Jacked and the next target stays with the workout.
How backoff weight is calculated
The tool applies a top-set load drop based on goal, top-set effort, fatigue, readiness, and rounding increment.
When to use bigger drops
Use a bigger drop after failure, high fatigue, poor readiness, or heavy low-rep top sets.
When to use smaller drops
Use a smaller drop when the top set moved well and the goal is strength practice with crisp reps.
Common mistakes
Do not turn every backoff into another top set. Backoffs should build quality volume after the heavy signal.
Short answers
What percent should backoff sets use?
Many lifters land around a 10-20% drop, adjusted by goal, fatigue, and top-set difficulty.
Are backoff sets for hypertrophy or strength?
Both. The top set gives a heavy signal; backoffs add repeatable volume.
Jacked turns your training history into next-set targets, RIR tracking, rest timing, smart warm-ups, PRs, and progress feedback.
Method, assumptions, and privacy
Method
Applies a top-set load drop based on goal, top-set effort, fatigue, readiness, and rounding increment.
Assumptions
Backoffs work when the top set reflects today’s strength and the follow-up sets stay hard but repeatable.
Privacy
Inputs are handled in the browser for the web tool experience. Jacked should only store lifting data when a user chooses to log it in the app.
Check the method before you trust the number. Bad inputs still produce tidy-looking outputs.
This is one set.
Jacked does it for your whole workout: next-set targets, RIR, rest timing, warm-ups, PRs, and progress feedback.
Download Jacked for iPhone