One Rep Max (1RM Epley) & Training Load Calculator
The formula
Why Submaximal 1RM Estimation Protects Lifters
Testing a true 1RM imposes immense shear forces across tendons, ligaments, and joints. Developed by coach Boyd Epley in 1973 for the Nebraska Cornhuskers football team, submaximal 1RM equations allow coaches to program progressive overload percentages (e.g. 5/3/1, Russian Periodization) without subjecting athletes to maximal strain.
Frequently asked questions
Are 1RM formulas accurate above 10 reps?
Source & methodology
Epley B. "Poundage Chart." Boyd Epley Workout. 1985; Brzycki M. "Strength testing—predicting a one-rep max." JOPERD. 1993.
One Rep Max (1RM Epley) & Training Load: what this tool answers
You are here because you need a specific number, and you want to see how it was produced before you rely on it. Searchers land on a One Rep Max (1RM Epley) & Training Load page for three reasons — to plan, to compare options, and to check that somebody else’s arithmetic is honest. This tool serves all three, and everything after the calculator explains the model instead of hiding it.
There is a habit that separates people who get useful answers from Strength Training numbers: they decide what question the figure answers before they compute it. One Rep Max (1RM Epley) & Training Load answers “Estimated One Repetition Maximum (1RM)?” — and nothing else, which is precisely why the result is trustworthy.
Training math in Fitness & Sports converts effort into load, and load into adaptation. One Rep Max (1RM Epley) & Training Load does the conversion: Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps). Athletes who understand their numbers progress faster because they can separate programming from recovery — and the 116.66666666666667 result above is exactly that separator.
Every figure in the prose is generated by the engine rather than written beside it — the worked example resolves to estimated One Repetition Maximum (1RM) = 116.66666666666667 on the default inputs, and the sensitivity section ranks the inputs that move the result — Weight lifted during set first, at ≈10.0 % of the headline for a ten-percent error either way in that input. Read the sections in order and you will be able to reproduce every figure by hand.
Inside the One Rep Max (1RM Epley) & Training Load calculation: formula and every input
One formula, published in full: Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps). Anything you can read, you can reproduce in a spreadsheet, and that reproducibility is the whole point of printing it rather than hiding it behind a button.
Weight lifted during set (kg) (example value 100) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. Stay in one unit system top to bottom; conversion rounding is where small errors enter.
Repetitions completed to technical failure (example value 5) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. If you are unsure what belongs in this field, look at the printed steps: the substitution shows exactly how the engine uses it.
Compound Barbell Exercise (example value Barbell Back Squat) is a selector, not a measurement: the engine follows a different route for each option. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
A fully worked One Rep Max (1RM Epley) & Training Load example
Abstract formulas are hard to trust, so here is the complete substitution using the default inputs, written the way an examiner would want it. Starting figures: Weight lifted during set (kg), Repetitions completed to technical failure, Compound Barbell Exercise. The endpoint of that chain is 116.66666666666667 of estimated One Repetition Maximum (1RM), sitting in the “🟢 1RM Benchmark: Calculated via Epley formula (100.0 kg × 5 reps). Brzycki: 112.5 kg.” band.
- Weight Lifted = 100 kg | Reps Completed = 5 reps
- Epley Formula: 1RM = Weight × (1 + Reps ÷ 30)
- Epley Calculation = 100 × (1 + 5 ÷ 30) = 100 × 1.1667 = 116.7 kg
- Brzycki Calculation = 100 ÷ (1.0278 − 0.0278 × 5) = 112.5 kg
- 80% Hypertrophy Set Weight = 116.7 kg × 0.80 = 93.3 kg
Brzycki Formula 1RM — 112.51125112511251. Compare it against the main result of 116.66666666666667 before drawing conclusions.
Lombardi Formula 1RM — 117.4618943088019. If your inputs change, this is usually the first companion figure to move.
90% Heavy Working Load (3-4 Reps) — 105. If your inputs change, this is usually the first companion figure to move.
80% Hypertrophy Working Load (7-8 Reps) — 93.33333333333334. If your inputs change, this is usually the first companion figure to move.
70% Speed / Technique Load — 81.66666666666667. Read next to the headline, this is the figure that shows the shape of the trade-off.
Re-running with your own figures is instant; re-running by hand once is the best way to know the tool is telling you the truth.
The One Rep Max (1RM Epley) & Training Load corridor: your result across a realistic band
The honest version of any estimate is a corridor, and this one is cheap to produce: One Rep Max (1RM Epley) & Training Load was recomputed at 5 points along the dominant input, with every other field left untouched.
| Weight lifted during set setting | Estimated One Repetition Maximum (1RM) |
|---|---|
| 80 % of the example value | 93.33333333333334 |
| 90 % of the example value | 105 |
| example inputs | 116.66666666666667 |
| 110 % of the example value | 128.33333333333337 |
| 120 % of the example value | 140 |
Across 5 settings of Weight lifted during set, the result spans 93.33333333333334 to 140. A decision that only works at one row of this table is a decision waiting for an input to move. Reproduce it in the form above by editing Weight lifted during set alone; the substitution steps will follow your figures exactly.
What actually moves your One Rep Max (1RM Epley) & Training Load
Nobody should have to guess which input matters. The engine was re-run once per field below — ten percent up, ten percent down, everything else frozen — and the results ranked by how far they moved the estimated One Repetition Maximum (1RM). For One Rep Max (1RM Epley) & Training Load the ranking is measured rather than guessed, and it belongs to these defaults: shift the starting point and the order can shift with it.
- Weight lifted during set: ten percent up gives 128.33333333333337, ten percent down gives 105 — ≈10.0 % of the estimated One Repetition Maximum (1RM) either way
- Repetitions completed to technical failure: ten percent up gives 118.33333333333333, ten percent down gives 114.99999999999999 — ≈1.4 % of the estimated One Repetition Maximum (1RM) either way
Weight lifted during set is the dominant lever here: ten percent either way moves the result by about 10.0 %, from 105 to 128.33333333333337. Measure that input from a document rather than from memory, and treat Repetitions completed to technical failure as the second priority (≈1.4 % per ten percent). Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
Reading the result: bands, zones and thresholds
A number on its own is trivia; a number against a range is intelligence. The verdict attached to the default calculation — “🟢 1RM Benchmark: Calculated via Epley formula (100.0 kg × 5 reps). Brzycki: 112.5 kg.” — is one band on a ladder your own figure may sit somewhere else on. Before treating the band as fact, note its width: ten percent either way on Weight lifted during set already spans 105 to 128.33333333333337. The practical reading rules: read the band as a starting hypothesis, then test it: change the two dominant inputs by ten percent and see whether the verdict survives. Verdicts that survive stress are the ones worth acting on.
Set One Rep Max (1RM Epley) & Training Load beside its neighbours and it usually plays a specific role: this figure establishes the size of something, and the neighbouring tools establish whether that size is acceptable. Skipping the first step makes the second one arbitrary.
Why One Rep Max (1RM Epley) & Training Load results go wrong — and how to prevent it
Reading One Rep Max (1RM Epley) & Training Load as a promise rather than a conditional. Every number here is of the form “if these inputs, then this result”; when an input moves, the honest response is to recompute rather than to defend the old figure.
Reading One Rep Max (1RM Epley) & Training Load as a promise rather than a conditional. Every number here is of the form “if these inputs, then this result”; when an input moves, the honest response is to recompute rather than to defend the old figure.
Attention is also misallocated between fields. Having measured this engine, we can say where it belongs: Weight lifted during set first, everything else second.
A final trap is presentation: reporting One Rep Max (1RM Epley) & Training Load to more decimal places than the inputs support. The tool prints what the arithmetic gives; you should quote only what your least precise field justifies.
Before you trust your One Rep Max (1RM Epley) & Training Load: a short checklist
- Re-run the calculation with a ±10 % stress on the two most sensitive inputs.
- Record the date and the inputs alongside the number so future-you knows what was assumed.
- Put Weight lifted during set under a magnifier; the sensitivity table above is the reason why.
- Compare the result with one independent method or published benchmark.
- Verify each input against its original source document, not memory.
- Repeat the ±10 % test on the inputs that matter and see whether the decision — not just the number — still holds.
A routine for decision-grade One Rep Max (1RM Epley) & Training Load
Using a calculator well sounds trivial, but the difference between a decision-grade figure and a throwaway one lives entirely in the routine. The routine for One Rep Max (1RM Epley) & Training Load takes a minute to learn and applies to every input above.
Step 1 — start from evidence. The inputs behind One Rep Max (1RM Epley) & Training Load are weight lifted during set (kg), repetitions completed to technical failure, compound barbell exercise. Write them down with their source next to each one; if you cannot name where a figure came from, that is the input most likely to be wrong. If the answer changes your behaviour, it deserves a second run with different assumptions.
Step 2 — enter the conservative case first. Resist the flattering scenario. Type the inputs you would defend in front of a sceptical reader, read the Estimated One Repetition Maximum (1RM) (116.66666666666667 for the example values), and note the verdict band. Repeating a calculation with the same numbers proves only that the arithmetic is reliable — which is worth knowing.
Step 3 — change one input at a time. Nudge a single field by ten percent, watch the headline and its companions move, then undo it. Two or three fields will dominate — the sensitivity table above already ranks them for this engine. Compare the calculation to the rough guess you arrived with, and ask why they differ.
Step 4 — stress before you commit. A decision that survives a ten-percent squeeze on its two biggest inputs needs no luck to be sound. One that does not survive is a decision about hope, not about arithmetic. A figure nobody can reproduce is a figure nobody will act on twice.
Step 5 — schedule the next run. In Fitness & Sports the inputs drift quietly. Put a reminder a quarter out, re-enter the same fields, and read the change rather than the level. The fastest sanity test is to guess the answer first and see how far the calculation disagrees.
The real-world conversations One Rep Max (1RM Epley) & Training Load settles
Numbers earn their keep in conversations, and One Rep Max (1RM Epley) & Training Load is no exception. In Fitness & Sports discussions around Strength Training, this figure decides whether an option stays on the table: it converts an opinionated debate into an arithmetic one, and arithmetic is the only referee both sides accept. The point of transparency is that a reader can disagree with a specific line rather than with you.
Professionals in Strength Training use this style of calculation as a screening filter before spending real money or effort: a quick One Rep Max (1RM Epley) & Training Load check eliminates weak options in minutes, and the survivors earn the deeper, slower analysis. The test of a good estimate is not that it feels right but that it changes what you do.
Nothing here is stored or transmitted, so the habit of checking is free: open the page, re-enter current figures, compare with the number you saved last time. A figure nobody can reproduce is a figure nobody will act on twice.
One Rep Max (1RM Epley) & Training Load — frequently asked questions
What affects One Rep Max (1RM Epley) & Training Load the most?
One Rep Max (1RM Epley) & Training Load is driven above all by Weight lifted during set. Perturbing only that field by ten percent either way produced 128.33333333333337 against the 116.66666666666667 baseline — a ≈10.0 % response, while Repetitions completed to technical failure manages ≈1.4 %.
Which matters more: repetitions completed to technical failure or weight lifted during set?
By the numbers, Weight lifted during set: a ten-percent change in it moves the result ≈10.0 %, versus ≈1.4 % for Repetitions completed to technical failure. Spend your measuring effort in that order — precision on the weaker lever buys almost nothing.
What is a typical One Rep Max (1RM Epley) & Training Load?
There is no honest universal average for One Rep Max (1RM Epley) & Training Load, but there is a reference point: the defaults on this page produce 116.66666666666667 (🟢 1RM Benchmark: Calculated via Epley formula (100.0 kg × 5 reps). Brzycki: 112.5 kg.). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate One Rep Max (1RM Epley) & Training Load by hand?
Use the stated model — Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps) — and substitute in the order the tool prints (it starts from Weight Lifted = 100 kg | Reps Completed = 5 reps). On the example inputs the hand route lands on 116.66666666666667, exactly what the calculator shows. A spreadsheet reproduces it in two or three cells; doing it once by hand is what makes the automated answer trustworthy.
What happens to One Rep Max (1RM Epley) & Training Load if weight lifted during set changes by 10 %?
On these inputs a ±10 % change in weight lifted during set takes One Rep Max (1RM Epley) & Training Load to 128.33333333333337 against the 116.66666666666667 example — around 10.0 % of the headline. The same test on every other field is in the sensitivity section.
Is the One Rep Max (1RM Epley) & Training Load result of 116.66666666666667 good or bad?
The tool answers “what”, not “whether”: 116.66666666666667 carries the verdict “🟢 1RM Benchmark: Calculated via Epley formula (100.0 kg × 5 reps). Brzycki: 112.5 kg.” for the default case, which is a starting interpretation rather than a verdict on your situation. Re-run with your own figures and compare the bands.
How do I calculate One Rep Max (1RM Epley) & Training Load manually?
Write down the inputs, then follow the printed steps in order — Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps). A spreadsheet replicates it with two or three cells. The manual route is worth doing once to build intuition; after that the calculator saves time and eliminates transcription slips.
Is One Rep Max (1RM Epley) & Training Load accurate?
The arithmetic is exact: Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps) is evaluated with full floating-point precision and every substitution is printed in the worked example. What limits accuracy is input quality and the model’s assumptions, so treat the 116.66666666666667 result as the correct answer to the question you typed — and check the assumptions section before acting on it.
Are 1RM formulas accurate above 10 reps?
No. Once repetitions exceed 8 to 10 reps, energy system reliance transitions toward local muscular endurance and lactate tolerance, causing 1RM formulas to drastically overestimate true maximal strength.
Can this tool see the numbers I type?
It cannot. There is no submission step: the calculation happens in your browser and the result disappears when you close the page. Treat the fields above as a scratchpad rather than a form.
The vocabulary of One Rep Max (1RM Epley) & Training Load
- Brzycki Formula 1RM
- 112.51125112511251 on the example inputs — a companion figure printed beside the headline of One Rep Max (1RM Epley) & Training Load so that no result is read in isolation.
- Lombardi Formula 1RM
- 117.4618943088019 for the One Rep Max (1RM Epley) & Training Load worked case; it sits next to the main result because it carries context the headline leaves out.
- 90% Heavy Working Load (3-4 Reps)
- 105 on the example inputs — a companion figure printed beside the headline of One Rep Max (1RM Epley) & Training Load so that no result is read in isolation.
- Estimated One Repetition Maximum (1RM)
- The primary output of this tool: 116.66666666666667 for the default inputs, computed exactly from Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps).
- Worked example
- Every substitution in order, from the example inputs to 116.66666666666667 — the audit trail for the headline figure.
- Verdict band
- The interpretation attached to a result (“🟢 1RM Benchmark: Calculated via Epley formula (100.0 kg × 5 reps). Brzycki: 112.5 kg.” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the One Rep Max (1RM Epley) & Training Load moves when a single input is nudged ten percent either way; the ranked list on this page is computed live from this engine.
Where the One Rep Max (1RM Epley) & Training Load model comes from
The model is published arithmetic implemented exactly as written: Epley: 1RM = Weight · (1 + Reps/30) | Brzycki: Weight / (1.0278 - 0.0278·Reps). Source of record: Epley B. "Poundage Chart." Boyd Epley Workout. 1985; Brzycki M. "Strength testing—predicting a one-rep max." JOPERD. 1993. Specialist software layers extra coefficients on top of the same algebra; none are hidden here, and that transparency is what makes a disagreement traceable to a specific input instead of a black box.
This page is an estimation aid, not professional advice. The design rule is simple: two people entering identical figures must get identical answers. The sensitivity table above is part of that promise rather than a bonus: it lets you see how much of the result depends on how carefully you measured.
After the number: what to do with it
Save the number together with its inputs and today’s date; a One Rep Max (1RM Epley) & Training Load figure without context is unusable the moment an input changes.
Whoever you are (people who need one trustworthy number before their next decision), the next step is the same: replace the example inputs with your own, note the date, and re-run whenever a figure moves. In Fitness & Sports, a dated figure is a trend, and an undated one is a rumour.