Skip to content
RackMath Train free

Barbell Calculator

RackMath is the barbell calculator that turns a target into exact plates—then keeps your workout, program, and progress moving.

Start lifting free Calculate plates

Free calculator lb + kg Works on any device

01Exact plate math
02Live workout flow
03Program progression
04Training history

Zero mental math

Tell it the weight.
Load the bar.

RackMath translates your target into a clear, per-side answer. Custom plates and both lb and kg setups are built into the flow.

Use the free barbell calculator
RackMath barbell calculator showing a 185 pound target, 45 and 25 pound plates per side, and a 185 pound total.

Training intelligence

One place from warm-up to PR.

Focused enough to disappear between sets. Structured enough to carry a full training block.

Live workout

Your whole set, at a glance.

Exercise, load, reps, plates, timer, and completion controls stay in one fast view.

Explore workout tracking
Complete RackMath dark-mode workout screen showing exercise, weight, reps, plates, timer, and workout controls.
Program mode

Always know what comes next.

Import or follow structured programs with your next workout and progression ready to go.

Explore program progress
  • RackMath My Program overview showing a 12-week strength block and progression schedule. Program overview
  • RackMath My Program schedule highlighting the next workout and upcoming deload week. What comes next
  • RackMath workout preview showing a Week 7 front squat session and exact plates. Workout preview
  • RackMath recovery-day preview with current one-rep-max progress. Recovery day
  • RackMath recovery preview showing the next rest day and strength progress. Built-in recovery
  • RackMath deload workout preview showing target weight, reps, and exact plates. Deload preview

How it works

From plan to plates in three moves.

No bloated setup. No tab hopping. Just the next useful decision.

  1. 01
    Set the target

    Choose the lift, weight, reps, and sets.

    Complete RackMath workout screen showing the selected lift, target weight, reps, sets, and calculated barbell.
  2. 02
    Load with confidence

    See the exact plates for each side.

    Complete RackMath workout preview showing the exact plates per side for a 185-pound target.
  3. 03
    Keep the signal

    Complete the set and keep the history.

    RackMath workout history showing completed exercises, weights, and reps.

Simple pricing

Start free.
Go deeper when you’re ready.

The core calculator stays useful from day one. Pro adds the structure for full training blocks.

Free

$0

forever

For fast plate calculations and simple training at the rack.

  • Barbell calculator
  • Common lb and kg plates
  • Mobile web access
Start free
Recommended

Pro

$3.97

/ month

$31/year billed annually — save $16.64 (35%).

  • Import and run structured workouts
  • Sync training across devices
  • Unlock deeper progress insights
Get RackMath Pro

Questions, answered

Before your first set.

Is RackMath free?

Yes. The core barbell calculator is designed to be fast and useful before you ever upgrade. RackMath Pro costs $3.97/month or $31/year.

Is RackMath a weight lifting calculator?

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

Does it work on mobile?

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

Can I use pounds and kilograms?

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

Can I track full workouts?

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

Read all FAQs

Built for the next set

Know your
next set.

Open RackMath and get the bar loaded.

Start lifting free Calculate plates