Deadlift 1RM Calculator
Use the Deadlift 1RM Calculator to calculate and interpret selected estimate.
Estimated deadlift 1RM
Enter your values, then calculate to see a verified result.
Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesReview the entered set, selected formula, Epley and Brzycki comparison, training-max percentage, and plate rounding.
Versioned calculationFormula v2.0.0
Method
Calculator logic, unit normalization, formula version, precision, rounding, invalid-input behavior, result actions, internal links, and responsive output.
Important boundary
Training and scoring results depend on correct inputs, a named formula version, and the stated equipment or competition context.
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Result + assumptionsInterpretation
The result reflects the current inputs and selected workflow.
Calculated with the versioned 2.0.0 model.
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Report a calculation issue Deadlift 1RM Calculator: purpose and method
Calculates selected estimate, loadable estimate, epley estimate, and brzycki estimate from deadlift set load, completed repetitions, estimate method, and available load increment with visible method, validation, precision, and limitations.
Keep exploring
Related calculators and resources
One-Rep Max CalculatorEstimate 1RM from a technically consistent submaximal set.Powerlifting Total CalculatorAdd the best successful squat, bench, and deadlift.Training Max CalculatorCreate and project a conservative programming base.Estimate Versus Test a Deadlift 1RMCompare a repetition estimate with a deliberately tested maximum.
Method and test recordFormula v2.0.0
- Recorded scope
- Calculator logic, unit normalization, formula version, precision, rounding, invalid-input behavior, result actions, internal links, and responsive output.
- Publisher
- CalculatorGeek
- Reviewed by
- CalculatorGeek Editorial Team
- Recorded review date
- 2026-09-21
- Next source review
- 2027-09-21 or when a cited formula, federation rule, or program source changes
- Definition fixtures
- 2 configured scenarios
- Published examples
- 2 shown below
Recorded method
Source-package vectors, independent formula checks, JavaScript/PHP differential parity, invalid-input boundaries, unit-equivalence cases, result-layout checks, contextual-link audit, schema validation, and responsive browser QA.
These records describe the published model and reference tests. A test-case count is not a certification of every possible input or an independent specialist review. Editorial policy
Known limitations
- Training and scoring results depend on correct inputs, a named formula version, and the stated equipment or competition context.
Method sources
- LeSuer et al. 1997 one-repetition maximum study
- Prediction of one repetition maximum strength
- ACSM Resistance Training Guidelines Update 2026
Latest model update
2026-09-16 - Premium strength and powerlifting rebuild from the supplied content package, legacy files, competitor review, and independent fixtures.
Reference inputs and expected results
These published examples are separate from the configured definition fixtures and any additional automated assertions. Expected values use the stated output units; invalid inputs are intended to be rejected.
| Case | Inputs | Expected result |
|---|---|---|
| Epley 180 kg for 3 | estimated_one_rm=198, epley=198, brzycki=190.5882352941 | |
| Brzycki 180 kg for 3 | estimated_one_rm=190.5882352941 |
Report an issue with this tool. Include the page URL, units, expected answer, and steps to reproduce. Do not include sensitive personal information.
On this page
How the calculation works
Enter the deadlift weight and completed repetitions. The calculator applies the selected named equation to estimate one-repetition maximum. Use a recent technically consistent set, preferably with fewer repetitions, and record stance, grip, belt, straps, bar height, and dead-stop or touch-and-go style.
- Epley estimate = weight × (1 + repetitions / 30).
- Brzycki estimate = weight × 36 / (37 − repetitions).
- If the tool averages equations, show every component estimate and state that the average is a site method rather than a published equation.
- Convert units once and retain full precision until the final display.
Continue with the One-Rep Max Calculator. Estimate 1RM from a technically consistent submaximal set.
For the next decision, read estimate versus test a deadlift 1RM.
Worked example
For 180 kg × 3, Epley gives 198.0 kg and Brzycki gives about 190.6 kg. A responsible result shows both or names the selected equation. It does not claim that the lifter can certainly pull the larger number on a specific day.
Continue with the Powerlifting Total Calculator. Add the best successful squat, bench, and deadlift.
How to interpret the result
- Prediction equations return different values because they model the relationship between load and repetitions differently.
- Deadlift estimates are sensitive to whether repetitions started from a dead stop or used rebound, and to whether grip or conditioning ended the set before the target muscles did.
- A tested competition result, a gym max, and an equation estimate are different records. Label them accordingly.
Limits and safety
- The calculator does not apply unsourced universal corrections for sumo versus conventional stance, belt use, grip, or touch-and-go repetitions.
- High-repetition sets add fatigue and technique variability.
- A calculator cannot assess readiness, pain, technique, or safe max-attempt conditions.
Choose the next calculator from the Strength Training and Powerlifting Calculators.
Inputs, outputs and result meaning
Calculates selected estimate, loadable estimate, epley estimate, and brzycki estimate from deadlift set load, completed repetitions, estimate method, and available load increment with visible method, validation, precision, and limitations.
Inputs
- Deadlift set load
- Supported units include kilograms (kg) and pounds (lb). The supported range is 0.01 through 2,000.
- Completed repetitions
- Supported units include reps. The supported range is 1 through 12.
- Estimate method
- Both formulas remain visible in the result. Available choices are Epley, Brzycki, and Average of both.
- Available load increment
- Use the smallest total-bar increment your equipment supports. Supported units include kilograms (kg) and pounds (lb). The supported range is 0.25 through 100.
- Rounding rule
- The exact value remains visible beside the loadable value. Available choices are Nearest increment, Round down, and Round up.
Outputs
- Selected estimate
- This is the primary result. The visible value uses up to 2 decimal places according to the output rule.
- Loadable estimate
- The visible value uses up to 2 decimal places according to the output rule.
- Epley estimate
- The visible value uses up to 2 decimal places according to the output rule.
- Brzycki estimate
- The visible value uses up to 2 decimal places according to the output rule.
- 90% training max
- The visible value uses up to 2 decimal places according to the output rule.
Full-precision calculation, one unit normalization, final display rounding. Keep the result label, unit, selected mode, and stated limitations together when sharing the answer.
Frequently asked questions
Which deadlift 1RM equation is best
No equation is best for every lifter. Show the selected method and compare outputs when possible.
Can I use touch and go reps
You can, but label the estimate and avoid comparing it directly with a dead-stop estimate.
How many repetitions should I use
Lower-repetition technically consistent sets generally require less extrapolation than high-repetition sets.
Should I test the estimate
Only when appropriate for your experience, technique, health, and supervision. Most programming does not require frequent maximal tests.
Sources
- LeSuer et al. 1997 one-repetition maximum study — Comparison of repetition-based 1RM prediction equations.
- Prediction of one repetition maximum strength — A validation study in a defined group of trained male high-school athletes.
- ACSM Resistance Training Guidelines Update 2026 — Current overview of the 2026 resistance training position stand.