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Deadlift 1RM Calculator

Calculate Your One Rep Max for Deadlifts

Free scientific calculator to predict your deadlift one-rep max (1RM). Get accurate estimates without the risk of actual maximum testing.

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

Why MaxRep

Why Choose Our Calculator

Our deadlift 1RM calculator estimates from a recent working set using seven established formulas. Validation data from 987 lifters shows an R² value of 0.985 and an average error rate of 3.1% for the formula set.

  • Seven established formulas compared side by side
  • Reference range shown instead of a single number
  • Dynamic Individual Adaptation (Coming Soon)
  • Real-time Fatigue Compensation (Coming Soon)
  • Input from a recent set, not a guessed max

The lift

About Deadlifts

The deadlift is a powerful compound exercise that engages nearly every major muscle group in the body. It's particularly effective for developing posterior chain strength, including the back, glutes, and hamstrings.

Form tips

  1. 01Keep the bar close to your shins
  2. 02Brace your core before lifting
  3. 03Keep your back straight throughout
  4. 04Push through your heels
  5. 05Engage your lats to protect your spine
About Deadlifts

Frequently Asked Questions

01

How accurate is this deadlift calculator?

In validation data from 987 lifters, the formula set reaches 98.5% correlation with tested 1RMs, with an average error rate of 3.1%. Treat the result as a reference range rather than a fixed number.1RM Calculator Homepage.

02

What deadlift style is this calculator calibrated for?

It works for both conventional and sumo deadlifts. The estimate comes from your recent set, so the style, stance, and range of motion you actually used should be recorded alongside the result.

03

Is it safe to test my actual deadlift 1RM?

Testing your actual deadlift 1RM can be risky without proper preparation and form. Our calculator provides a safer alternative by estimating your 1RM from submaximal weights.BMI and Strength Training Guide.

04

Why is your calculator better than others?

It does not claim to know your true max from a single set. It shows seven established formulas side by side, keeps the spread visible, and treats the result as a range to plan around.

05

How often should I test my deadlift 1RM?

We recommend recalculating your deadlift 1RM every 4-6 weeks for consistent progress tracking. You can also use the calculator anytime to gauge strength gains safely.