Skip to main content

Power VBT: Barbell 1RM

From estimate to measurement

A formula estimates your 1RM. Video shows how you moved it.

Record or import a set to measure rep-by-rep concentric velocity and bar path. Build a load–velocity profile for a more personal 1RM.

Download on the App StoreGet it on Google Play

Start free · Video based · No extra sensor

  • Rep velocity
  • Bar path
  • Velocity-based 1RM
Free 1RM calculatorCalculate your 1RM

1RM Calculator

Estimate your one-rep maximum with proven formulas. Also calculate Rep Max and Percentages of 1RM.

Results

Example 1RM Results using different formulas:

  • MultiModal Formula: 100kg bench press for 5 reps = 113.6kg 1RM
  • Brzycki Formula: 100kg squat for 5 reps = 114.5kg 1RM
  • Epley Formula: 100kg deadlift for 5 reps = 116.7kg 1RM

Rep Max

Example Rep Max calculations for 100kg 1RM:

  • 3RM (3 Rep Max): 95kg
  • 5RM (5 Rep Max): 87kg
  • 10RM (10 Rep Max): 75kg

Percentages of 1RM

Example percentages of 100kg 1RM:

  • 90% of 1RM: 90kg - Typically used for heavy singles and doubles
  • 80% of 1RM: 80kg - Common working weight for strength training
  • 70% of 1RM: 70kg - Often used for higher rep training

Four inputs, one clear result

How to use the calculator

Use a recent working set with consistent technique. The closer the set is to failure, the more useful the estimate usually becomes.

For a practical estimate, use a set of 3–10 reps performed with stable technique.

  1. 01Enter the weight you lifted.
  2. 02Enter how many clean reps you completed.
  3. 03Choose kilograms or pounds, then calculate.
  4. 04Compare the estimate, rep maxes, and training percentages.

Power VBT

VBT · 1RM · Training log

From estimate to measurement

A formula estimates your 1RM. Video shows how you moved it.

Record or import a set to measure rep-by-rep concentric velocity and bar path. Build a load–velocity profile for a more personal 1RM.

  • Rep velocity
  • Bar path
  • Velocity-based 1RM
Download on the App StoreGet it on Google Play

Start free · Video based · No extra sensor

Power VBT 1RM estimation screen
Power VBT video analysis screen showing barbell velocity and bar path

Lift-specific tools

Start with your main lift

The same calculator logic, with guidance tailored to each powerlifting movement.

Bench press 1RM

Estimate pressing strength from a clean working set.

Squat 1RM

Turn a recent squat set into training percentages.

Deadlift 1RM

Estimate your pull without testing a true max.

Useful numbers, without pretending one formula knows everything

01

Compare formulas

See a reference range instead of relying on a single prediction.

02

Plan working sets

Convert the estimate into rep maxes and percentages for your next session.

03

Measure when ready

Move from a population formula to your own video and load–velocity profile.

1RM questions, answered plainly

What is 1RM?

Your one-rep maximum is the heaviest load you can lift once with valid technique. It is commonly used to describe strength and set training intensity.

How accurate is a formula-based 1RM?

It is an estimate. Exercise, rep range, fatigue, and how close the set was to failure all affect the result, which is why this calculator shows several formulas.

Do I need to test a true maximum?

No. A submaximal set is usually enough for programming. If you do test a true maximum, use appropriate experience, setup, and supervision.

How is video-based 1RM different?

A load–velocity profile uses how quickly you move several loads. It reflects your own lifting data instead of only a general rep formula.