RackMath
Plates, warmups & workouts
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
The plate calculator is free, forever. Type a weight, see exactly which plates to load. Coach adds warmup ramps, daily plans, and follow mode: free for 10 workouts.
Stop doing plate math between sets.
Type the weight you want on the bar and Rack Math shows exactly which plates to load per side, based on your plates, your bar, and your gym. Build a list of
weights, and it tells you precisely what to ADD and REMOVE to get from each set to the next, so you spend your rest resting.
FREE, FOREVER
• Instant plate math for any weight, in lb or kg
• Your plate inventory: only weights you can actually make
• Bar diagrams that match what’s on the bar
• Build-on-bar: enter what’s loaded right now and work from there
RACK MATH COACH
Turn the calculator into a training partner. Try the Coach free for your first 10 workouts. No account. Nothing to cancel. Keep it with a subscription or a one-time Lifetime purchase.
• A daily plan built around your lifts: Rack Math schedules what to train next and adapts as you recover
• Freshest: an extra generated session for off days. Lifts picked from whatever your recovery says is most rested, with the day’s plan built around them
• Cardio-aware recovery: with Apple Health, your runs, rides, and swims count toward what’s fresh, tracked as one total across activities, so swapping a walk for a run never reads as slacking
• Unlimited weights in your stack
• Warmup ramps in one tap: straight sets, top set + backoff, or 5/3/1
• Follow mode: the current set lights up, DONE advances, the next plate change is always right in front of you
• Lock Screen Live Activity: your rest countdown, next set, and exact plate change. Log your set, skip rest, or load the next exercise without
unlocking your phone
• Apple Watch: follow along from your wrist with displays for weight, per-side plates, a rest timer that taps you when it’s up, and one-tap DONE, synced from your iPhone
• Automatic progression: Rack Math suggests your next weights and reps
• Strength tracking: your estimated 1-rep max over time, and personal records
• Gyms: save plate setups for home, work, or travel and switch in two taps
• Workout timer with per-exercise split times
• Apple Health: finished workouts logged as strength training (optional)
• Workout history: what you lifted, how long it took, your top weight, and the ability to reload any past stack onto the bar
• Fewer-swaps optimizer: re-arranges the whole workout’s plate layouts to minimize how many plates you touch
• Save and reload your stacks
Choose your plan: Monthly, Annual (best value), or pay once for Lifetime. The plate calculator stays free either way. No ads.
PRIVATE BY DESIGN
Rack Math has no accounts and no ads. Your training lives on your device and, if you use iCloud, syncs privately through your own iCloud account; we never see it. We use one privacy-first analytics tool that collects no personal data and can’t identify you. Writing to Apple Health is entirely opt-in. See our privacy policy: https://keithjeffery.org/rack-math-privacy
Train what’s actually recovered.
• Freshest: a new generated session that answers “I’m here on an off day. What should I train?” Rack Math picks lifts from whatever your recovery says is most rested, without stealing from your next scheduled sessions, and builds the day’s plan around them.
• Cardio, seen whole: your total cardio load is now tracked across activities, so swapping a walk for a run or a swim reads as the trade it is, not as backing off. Familiar kinds of effort also count more fairly toward recovery than brand-new ones.
• Lock Screen: log your set right from the Live Activity: tap Done, then tap again to confirm, so a stray touch never logs a lift.
• Plus bug fixes and smarter training suggestions throughout.
The plate calculator stays free forever. The coaching features are part of Rack Math Coach, which is free for your first 10 workouts.
The developer, Keith Jeffery, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Keith Jeffery
- Size
- 7.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Annual Access to Coach $49.99
- Monthly Access to Coach $9.99
- Lifetime Full Access $99.99
- Copyright
- © 2026 Keith Jeffery
