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Deadlift One Rep Max (1RM) Calculator

Estimate your one rep max from any set of 2–12 reps using four proven formulas, and get your training percentages from 50% to 95%.

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Result

This page opens the one rep max calculator set up for the deadlift — enter the weight you pulled and the reps completed (2–12), and it instantly shows your estimated deadlift 1RM from four formulas with their average, plus a 50–95% percentage table.

Max-effort deadlifts are among the most fatiguing lifts in the gym, which is exactly why estimating from a rep set is standard practice: pull 180 kg for a strict triple and Epley projects about 198 kg while Brzycki gives about 190.6 kg — the average is your realistic planning number. Keep test sets to 5 reps or fewer; grip and lower-back form tend to degrade on high-rep pulls and inflate the error.

Use the chart to load your pulling sessions: 65–75% for speed and volume work, 80–85% for heavy sets of 3–5, 90%+ only for peaking. All math runs live in your browser in kilograms or pounds, with nothing uploaded anywhere.

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Accepted Formats & Rules

  • Epley, Brzycki, Lombardi and O'Conner formulas calculated together with their average.
  • Works in kilograms or pounds with any weight, for sets of 2 to 12 reps.
  • Training percentage table from 50% to 95% of your estimated max in 5% steps.

Key Benefits

✓ Estimate your 1RM safely from a submaximal set — no risky max-out attempt needed.
✓ Four formulas shown side by side with their average, so you see the realistic range at a glance.
✓ A ready 50–95% percentage chart turns the estimate straight into training weights.

Use Cases

  • • Estimate your bench, squat or deadlift max safely from a heavy set of five instead of a risky max-out attempt.
  • • Convert a rep PR into training weights: get 50-95% percentages of your 1RM for 5x5, hypertrophy or peaking blocks.
  • • Compare Epley, Brzycki, Lombardi and O'Conner estimates side by side to see the realistic range of your true max.