Plate Calculator: Barbell 1RM

PREMIUM — PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase.

Punch in your target weight and RepRack tells you exactly which plates go on each side of the bar — using only the plates your gym actually owns.

RepRack is a plate calculator first, not another bloated workout social network. The plate math runs on an exact integer grid, so it never lies to you the way rounded conversions do — if 75 lb loads perfectly with a 10 and a 5 per side, it says so. Tell it which denominations your gym has, pick your bar (20/15/10 kg or 45/35/25 lb), and every number it shows is a weight you can physically build.

WHAT YOU GET

• Type 225 and read the loadout off the screen — a 45 and a 25 on each side — before you have picked up the first plate
• A warm-up ramp at 40, 60, 75 and 90% where every step is snapped down to a weight your plates can actually make, with reps for each set
• Your estimated one rep max via Epley, with Brzycki shown alongside, plus a training percentage table derived from the same curve so two screens never disagree
• See where your squat, bench, deadlift and press sit on Beginner-to-Elite bodyweight milestone bands
• Log sets in seconds and watch your e1RM trend and weekly volume climb on Progress charts, with per-session totals and PRs
• A rest timer that rings even when your phone is locked in your pocket, capped so a forgotten timer never runs for hours

PERFECT FOR

• Barbell lifters who freeze at the rack doing plate arithmetic between heavy sets
• Powerlifters running 5/3/1 or 5x5 who need exact percentage loads on the bar
• Beginners wondering whether a bodyweight bench is good — check the milestone bands
• Anyone whose gym is missing half its change plates: RepRack only ever suggests plates you told it exist

WHY NOT JUST USE A NOTES APP? Notes cannot subtract the bar, divide by two sides, and round to real plate denominations. RepRack solves that on an exact grid, tells you when a target is unloadable with your plate set, shows the closest weight you can build, and reports exactly how far short it leaves you.

PRIVATE BY DEFAULT

Everything stays on your iPhone. No account, no sign-in, no data leaving the device.

PREMIUM (PURCHASE REQUIRED)

RepRack requires a subscription or a one-time purchase. Full access unlocks the plate calculator, one rep max tools, warm-up ramps, strength milestones, all five training programs (5x5 Strength, 5/3/1 Big Four, Push/Pull/Legs, Upper/Lower, Full Body 3x), the workout log, and Progress charts. Choose weekly, yearly, or lifetime (one-time payment).

Stop doing plate math in your head between sets — download RepRack and punch in your next target weight.

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