Coming soon to iPhone and Android

Plate math,
done at the rack.

IronMath is an offline-first barbell plate calculator and set log. Type the weight you want and see exactly what goes on each side of the bar, in pounds or kilos, with the plates your gym actually has.

Get notified Try the calculator

Pounds by default, 45 lb Olympic bar pre-selected. No ads. No third-party analytics.

Load

Commercial Gym

TargetLBKG

315−+

Load on the bar

315 LB

142.9 KG

Exact

Log set

RestGlance

Illustration of the Load tab

Try it here

The same solver, in your browser.

This is IronMath's plate solver ported to plain JavaScript, loaded with the app's default Commercial Gym plates. Type a target and it finds the load, per side.

Target (LB)

Bar

Rounding bias

Plates (pairs): 55 ×2, 45 unlimited, 35 ×2, 25 ×2, 10 ×4, 5 ×2, 2.5 ×2. In the app you set your own pair inventory, collars and micro plates.

Load on the bar

225 LB

102.1 KG

Exact

Each side: 45 + 45

How it works

Three taps between you and the set.

There is no keypad chrome in the way. Tap a number, a pad slides up with Clear and Done, and it slides away when you are finished.

Type the target

Enter the weight, or nudge it with the −/+ 2.5 steppers. LB and KG read out side by side.

Load each side

IronMath solves the sleeve from the plates your gym owns. If the exact number is not loadable, it shows the next weight down and up.

Log the set

Pick the lift, tap the reps, add an RPE if you like. It calls out a personal record on the spot and starts your rest timer.

Five tabs

Everything the bar asks of you.

Load, Reverse, Warm-Up, Log and Tools, with Settings for your gyms and plates.

Load

Target to sleeve

Dual LB/KG readout, −/+ 2.5 steppers, the next loadable weight up and down, bar and collar presets, and one-tap set logging.

Reverse

Plates to total

Tap plates onto an empty sleeve and read the live total. Log it straight from there.

Warm-Up

A ramp you can load

Quick, Standard or Thorough ramps with reps, plus keep / strip / add hints between sets.

Log

Every set, by day

Per-lift bests, an estimated-max trend, and CSV export through the share sheet.

Tools

The math around the lift

1RM, RPE/RIR, percentage chart, DOTS and IPF GL, meet attempts, LB/KG converter, rest timer and gym glance.

Settings

Your gym, your plates

Gym profiles, pair inventory, rounding bias, warm-up ramp, haptics, and bumper vs black iron plates.

Warm-Up

Know what to strip before you strip it.

Pick a ramp and a working weight. Every rung is solved against your plates, and IronMath tells you what to take off and put on from the last set.

Quick. Four sets. When the gym is busy or the weight is light.
Standard. Six sets. The default ramp for most working weights.
Thorough. Seven sets with smaller jumps. For heavy singles and meet day.

Standard to 275 LBIllustration

Bar45 LB10 repsBar only

40%110 LB8 repsEach side: 10 + 10 + 10 + 2.5

60%165 LB5 repsFrom last set: take off the 10s and the 2.5, put on the 25s.

75%205 LB3 repsFrom last set: take off the 25, put on a 45.

85%235 LB2 repsFrom last set: take off the 10, put on a 25.

100%275 LBWork setFrom last set: take off the 25, put on a 45.

How the solver picks plates

A subset-sum over one sleeve, stepped by the greatest common divisor of the plates your gym owns. It is small enough to re-solve on every keystroke, even with quarter-pound micro plates on the rack.

ClosestThe default. Whichever bar is nearer. Exact ties go to the lighter one.

Never go overAlways round down.

Never come in lightAlways round up, or the heaviest your gym can build.

Rounding bias

When the number isn't loadable.

You decide which way to miss. The bias applies to Load, Warm-Up, the percentage chart and the glasses HUD, so a ramp set to "never go over" never goes over.

Tools

The rest of the math.

Grouped by lift and goal, all computed on the phone.

1000 lb ClubSquat, bench and deadlift. How far from 1000 LB or 500 KG.

Estimate your maxA weight and the reps you got. It estimates the most you could lift once.

Percentage chartType a max. See 50 to 100 percent, and what your gym can load at each one.

How hard is this setPick reps and RPE. It suggests the load off your max.

How much moreWhat you have now, what you want, and the gap.

Gym glanceHuge Load and Convert for the rack, lock screen, and Meta Display glasses.

Rest timer60 to 300 seconds. Counts down on the lock screen, Dynamic Island, and glasses.

Convert LB and KGWhen the plates and the program use different units.

Meet scoreDOTS and IPF GL from bodyweight and total.

Plan three attemptsOpener, second and third for a meet.

Offline-first

Works with no signal

The math runs on the phone. Weights, plate counts and your set log are stored locally.

Private

No ads, no trackers

No third-party analytics. An account is optional and only exists to sync your data to another phone.

Your data

Take it with you

Export your whole log as CSV from the share sheet, whenever you want.

Coming soon to iPhone and Android.

IronMath isn't in the stores yet. Send a note and we will tell you when it is.

Get notified Questions? Support