Barbell calculator

Stop doing plate math between sets.

Type your target weight. Platezy shows exactly which plates go on each side of the bar, in lb or kg, right down to the 1.25s. Works offline, no account needed.

Platezy calculator showing 250 kg as 4 × 25 kg plus 1 × 15 kg per side on a loaded barbell
Platezy calculator showing 235 lb as 2 × 45 lb plus 1 × 5 lb per side
✓ Exact MatchPer side: 4 × 25 kg + 1 × 15 kg

Everything between the rack and the bar.

Warmup Ladder · Pro

Know every warmup set before you touch the bar.

Enter your working weight and get a ramp from the empty bar to your top set, with reps and the exact plates for each step.

Platezy Warmup Ladder listing sets from Bar Only to a 225 lb work set with per-side plates

Reverse Dialer · Pro

Walk up to a loaded bar. Get the total.

Tap the plates you see on each side and Platezy adds them up, bar included. No more squinting at a plate tree.

Platezy Reverse Dialer showing 200 lb total from tapped plates on the sleeve

Gym Inventory

Only the plates you actually own.

Tell Platezy how many pairs of each plate your gym has. When the 45s run out, it loads 35s and 25s instead of guessing.

Platezy Gym Inventory with colour-coded kilogram plates and pair counts

Three taps from target to loaded.

  1. 1

    Type the weight

    Use the big gym keypad, or tap +5, +10, +25 deltas to build up a number one-handed.

  2. 2

    Read the bar

    The barbell redraws instantly with the plates for each side, heaviest closest to the collar.

  3. 3

    Load and lift

    Need warmups or percentages? Switch tabs. Same weight, same bar, no retyping.

A closer look.

Why lifters pick Platezy.

Instant
Calculates as you type. No spinners, no network.
Offline and private
No account, no ads, no tracking. Your data stays on your iPhone.
Built for a dim gym
Dark, high-contrast screens and large tap targets for chalky thumbs.
Exact math
Integer-precision solver, so rounding errors never put the wrong plate on.

Questions

What does Platezy do?

You enter a target weight and Platezy shows exactly which plates go on each side of the bar, drawn on a barbell in real time. It also builds warmup ladders, a 50%–105% percentage table, and works backwards from plates you tap to the total weight.

Who is it for?

Powerlifters, commercial-gym lifters, home and garage gym owners, and Olympic lifters who want to stop doing plate math between sets.

Does it work with my plates?

Yes. Set how many pairs of each plate you own and Platezy will never suggest one you don't have. You can also pick different bars and include collars.

lb or kg?

Both. The default follows your region and you can switch any time. Plates use standard colour coding so they match what's on your bar.

Is it free?

The calculator is free. Platezy Pro unlocks the warmup ladder, percentages matrix, reverse dialer, PR log and custom gear. Pro is $1.99 per month, $9.99 per year with a 3-day free trial, or $19.99 once for lifetime access.

Does it need an account or internet?

No. Everything runs offline on your iPhone. There are no accounts, ads or tracking SDKs, and your settings and logs stay on your device.

What do I need to run it?

An iPhone running iOS 17 or later.

Load the right plates. Every time.

Free calculator, Pro tools when you want them. Download Platezy and get your next set loaded in seconds.

Download on the App Store
Platezy calculator with a loaded 250 kg barbell