RackMath Try free

Weight lifting calculator, barbell plate calculator, and workout tracker

Load the right plates. Track every set.

Rack Math is a weight lifting calculator that turns planned lifts into clear plate math, workout sessions, PRs, and progress insights, so you can stay focused under the bar.

Open Rack Math See how it works
Exact plates per side Workout sessions and history PRs, muscles, and insights
Rack Math dark mode calculator showing a deadlift set, rest timer, reps, total weight, and plates per side.
Rack Math pink calculator screen showing a deadlift workout and exact plate loading.
Rack Math light mode calculator screen with exact plate loading for a deadlift set.

Why lifters use it

A faster weight lifting calculator from planned weight to loaded bar.

Every missed calculation costs focus. Rack Math keeps the plates, the active workout, and your training history in one mobile-first flow.

Platesexact weight per side for lb and kg setups
Sessionssets, reps, timers, and workout history
ProgressPRs, muscles, and training insights

Features

Everything you need between the plan and the bar.

Plate math without the pause

Enter the target weight and Rack Math shows the plates to load on each side, with support for custom plates and units.

Workouts that move with you

Run sessions, complete sets, adjust loads, and keep your training day organized from your phone.

Progress you can review

Track history, PRs, muscle volume, and workout consistency so your training data stays useful after the lift.

Programs stay actionable

Import or follow structured training, see the next exercise, and keep progression moving without juggling notes.

Explore all Rack Math features

How it works

Keep the workout moving.

  1. Enter a lift, weight, reps, and sets.
    Rack Math workout fields for lift, weight, reps, and set controls.
  2. See the exact plates to load for each set.
    Rack Math plate calculator showing each side and total barbell weight.
  3. Complete the workout and save your history.
    Rack Math workout history with completed exercises and logged sets.
  4. Review PRs and recent training patterns.
    Rack Math personal records and training consistency dashboard.
  5. Use program progress to plan the next session.
    Rack Math program progress view with completed workouts and load progression.

Premium

Built for serious training weeks.

Free

$0

For quick plate calculations at the rack.

  • Fast barbell plate calculator
  • Common lb and kg plates
  • Mobile web access
Open Rack Math

Upgrade

Train with more context

For lifters who want imported programs, cloud sync, deeper tracking, and a smoother path from plan to completed workout.

  • Import and run structured workouts
  • Sync training across devices
  • Unlock deeper progress insights
Open Rack Math

FAQ

Useful before you upgrade.

Is Rack Math free?

Yes. The core plate calculator is designed to be fast and useful before you ever upgrade.

Is Rack Math a weight lifting calculator?

Yes. Rack Math works as a weight lifting calculator for barbell plate loading, workout sessions, set history, and PR tracking.

Does it work on mobile?

Yes. Rack Math is mobile-first and can be installed from supported browsers for quick gym access.

Can I use pounds and kilograms?

Yes. Rack Math supports common barbell and plate setups for lb and kg training.

Can I track full workouts?

Yes. Rack Math can log sets, preserve workout history, and help you review progress over time.

Read all FAQs

RackMath.app on the web

Spend less time doing plate math.

Open Rack Math and get your next set loaded.

Open Rack Math See features