RackMath

Type your target weight and see exactly which plates to load. Generate warmup ramps, follow your workout set by set, and track your time. Free to try.

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, for your plates, your bar, 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 • Gyms: save plate setups for home, work, or travel and switch in two taps • 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. Then keep it with a subscription or a one-time Lifetime purchase. • 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 • Automatic progression. Rack Math suggests your next weights and reps • Strength tracking: your estimated 1-rep max over time, and personal records • 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. 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 analytics. Your training lives on your device, and if you use iCloud, it syncs privately through your own iCloud account; we never see it. Writing to Apple Health is entirely opt-in. See our privacy policy: https://keithjeffery.org/rack-math-privacy