One Rep Max (Lombardi) Calculator
The formula
What the lombardi 1rm tells you
Giuseppe Lombardi’s power-law rep model: max effort scales as reps to the 0.1 — the smooth curve between the linear and hyperbolic camps.
Calculation: 1RM = w × r^0.10. Enter your inputs and every substitution is shown below the result.
Reading the result
Because it compresses at high reps, Lombardi suits bodybuilder-style sets where the other formulas fly away.
Rules of thumb: Lombardi 10RM factor = 1.26× load, vs Epley 1.33 and Brzycki 1.38
Limitations and best practice
At 3–5 reps Lombardi reads low compared to meet performance — the exponent fits endurance-trained subjects best.
This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Frequently asked questions
Where does 0.10 come from?
Best formula for squats?
Source & methodology
Lombardi 1989 power-law model.
How One Rep Max (Lombardi) works — and what your result really means
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 (Lombardi) 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.
People rarely disagree about arithmetic; they disagree about assumptions that were never written down. Printing the substitution and the sensitivity ranking removes that category of disagreement for One Rep Max (Lombardi).
What makes One Rep Max (Lombardi) worth calculating is not precision but position: it tells you which side of a threshold you are on, and by how much. A rough figure that settles the direction beats an elaborate one that never commits.
What makes a calculation page trustworthy is that its copy is derived from its own arithmetic: here est. 1RM = 141.6 kg, recomputed every time a field changes, and the sensitivity section ranks the inputs that move the result — Lift first, at ≈10.0 % of the headline for a ten-percent error either way in that input — which is the thread the rest of this guide pulls on.
How One Rep Max (Lombardi) is computed, line by line
The engine implements a single stated model: 1RM = w × r^0.10. There is no hidden coefficient and no login-gated precision — the formula printed is the formula executed, which is also what makes the result citable.
Lift (kg) (example value 115) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Stay in one unit system top to bottom; conversion rounding is where small errors enter.
Reps completed (example value 8) is a measured number in the unit named by the label; the formula does not convert for you. The example value is there to demonstrate the mechanics, not to describe your situation — overwrite it.
One Rep Max (Lombardi) on the example inputs: the complete substitution
Rather than describe the calculation, here it is end to end — every substitution in order, starting from the inputs above. Starting figures: Lift (kg), Reps completed. The computed est. 1RM comes out at 141.6 kg, which the interpretation band labels “The power-law curve (exponent 0.10) reads 115 × 8 as 141.6 kg — Lombardi is the gentlest of the classic trio and the one that survives long grind sets best”.
- r^0.10 = 8^0.10 = 1.2311
- × 115 = 141.6 kg
- Log-linear in nature: each doubling of reps adds ~7 %
Epley comparison — 145.7 kg. Compare it against the main result of 141.6 kg before drawing conclusions.
Brzycki comparison — 142.8 kg. Compare it against the main result of 141.6 kg before drawing conclusions.
Spread of the trio — 1.2 kg. Read next to the headline, this is the figure that shows the shape of the trade-off.
Adopted by — used in Australian strength testing norms. If your inputs change, this is usually the first companion figure to move.
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.
How far One Rep Max (Lombardi) can reasonably move
The honest version of any estimate is a corridor, and this one is cheap to produce: One Rep Max (Lombardi) was recomputed at 5 points along the dominant input, with every other field left untouched.
| Lift setting | Est. 1RM |
|---|---|
| 80 % of the example value | 113.3 kg |
| 90 % of the example value | 127.4 kg |
| example inputs | 141.6 kg |
| 110 % of the example value | 155.7 kg |
| 120 % of the example value | 169.9 kg |
That spread — 113.3 kg at the low end, 169.9 kg at the high — is what a careful read of One Rep Max (Lombardi) looks like: a band you can state out loud, with the reason for each edge. Reproduce it in the form above by editing Lift alone; the substitution steps will follow your figures exactly.
The levers behind One Rep Max (Lombardi), ranked by effect
This list was computed for this specific engine just now: each numeric input was nudged ±10 % while every other field held its example value, and the est. 1RM was recalculated from scratch. For One Rep Max (Lombardi) the ranking is measured rather than guessed, and it belongs to these defaults: shift the starting point and the order can shift with it.
- Nudge Lift by ±10 % and One Rep Max (Lombardi) lands between 127.4 kg and 155.7 kg (sensitivity ≈10.0 %)
- Reps completed +10 % → One Rep Max (Lombardi) = 142.9 kg · −10 % → 140.1 kg (the est. 1RM shifts ≈1.0 %)
Lift is the dominant lever here: ten percent either way moves the result by about 10.0 %, from 127.4 kg to 155.7 kg. That is where a careless figure does the most damage, so check it against a source, and treat Reps completed as the second priority (≈1.0 % per ten percent). The rest of the inputs earn only a rounding-error of attention, and that asymmetry is the practical payoff of measuring rather than asserting.
Reading the result: bands, zones and thresholds
Nobody acts on a bare figure — they act on a figure with a comparison attached. The default case lands in the “The power-law curve (exponent 0.10) reads 115 × 8 as 141.6 kg — Lombardi is the gentlest of the classic trio and the one that survives long grind sets best” band, and bands are deliberately wide because real situations overlap. How much of that band is luck? On Lift alone ten percent either way covers 127.4 kg to 155.7 kg. The practical reading rules: ask what would have to change to move you one band. If the answer is “a small, plausible input difference”, the band itself is not the finding — the uncertainty is.
In Fitness & Sports, One Rep Max (Lombardi) is one instrument in an orchestra: on its own it is a number, next to Epley comparison and Brzycki comparison it becomes a diagnosis. The tools linked above exist so the headline never has to carry that weight alone.
How people get One Rep Max (Lombardi) wrong
At 3–5 reps Lombardi reads low compared to meet performance — the exponent fits endurance-trained subjects best. This calculator gives an estimate based on standard formulas; it is not professional financial, medical, legal or engineering advice. Verify anything you plan to act on with a qualified professional and your own records.
Comparing a One Rep Max (Lombardi) computed here with a figure from another source that uses different conventions. Same name, different denominator — the disagreement is usually in the definitions, not the data.
This model has its own particular trap: Lift carries ≈10.0 % of the response per ten percent of error, so effort spent elsewhere is largely decorative.
Another is comparing across contexts: a One Rep Max (Lombardi) computed with one set of conventions should never be lined up against a figure computed with another. Check the inputs behind both before ranking them.
Before you trust your One Rep Max (Lombardi): a short checklist
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Compare the result with one independent method or published benchmark.
- Check Lift before anything else: it is the measured dominant input, ≈10.0 % of One Rep Max (Lombardi) per ten percent.
- Record the date and the inputs alongside the number so future-you knows what was assumed.
- Compare the output against one published benchmark or a colleague’s independent estimate.
- Confirm the answer against one independent method or published benchmark for One Rep Max (Lombardi).
How to use the One Rep Max (Lombardi) tool properly
The tool does the arithmetic; the routine below is what makes the arithmetic trustworthy. Five steps, a minute total — and afterwards you will know not just what the number is, but which assumption produced it.
Step 1 — start from evidence. The inputs behind One Rep Max (Lombardi) are lift (kg), reps completed. 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. Rounding early is the quietest way to introduce a permanent error.
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 Est. 1RM (141.6 kg for the example values), and note the verdict band. Half of a good calculation is knowing which input you would hate to be wrong about.
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. Repeating a calculation with the same numbers proves only that the arithmetic is reliable — which is worth knowing.
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. The test of a good estimate is not that it feels right but that it changes what you do.
Step 5 — record the context, not just the number. Note today’s date and the inputs alongside the 141.6 kg output. Six months from now the context is what turns this figure into a trend. Half of a good calculation is knowing which input you would hate to be wrong about.
Where One Rep Max (Lombardi) matters in practice
Fitness & Sports arguments end at arithmetic or they do not end. One Rep Max (Lombardi) is the arithmetic: 141.6 kg on the example inputs, reproducible by anyone who types the same numbers. A figure with a date beside it becomes evidence; without one it stays an anecdote.
The audience for this page is people who need one trustworthy number before their next decision. In professional Strength Training practice the pattern is always the same — screen with One Rep Max (Lombardi), then invest slow analysis only in whatever survives the screen. Precision is a promise you make about your data; make sure your inputs can keep it.
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. Write the figure down before moving on; memory flatters whichever number you saw last.
People also ask about One Rep Max (Lombardi)
What affects One Rep Max (Lombardi) the most?
One Rep Max (Lombardi) is driven above all by Lift. Perturbing only that field by ten percent either way produced 155.7 kg against the 141.6 kg baseline — a ≈10.0 % response, while Reps completed manages ≈1.0 %.
Which matters more: reps completed or lift?
By the numbers, Lift: a ten-percent change in it moves the result ≈10.0 %, versus ≈1.0 % for Reps completed. Spend your measuring effort in that order — precision on the weaker lever buys almost nothing.
What is a typical One Rep Max (Lombardi)?
On the worked example above One Rep Max (Lombardi) comes out at 141.6 kg. Treat that as one point on a distribution rather than a norm: the bands, the companion outputs and the sensitivity ranking tell you how wide the plausible range really is.
How do I calculate One Rep Max (Lombardi) by hand?
Use the stated model — 1RM = w × r^0.10 — and substitute in the order the tool prints (it starts from r^0.10 = 8^0.10 = 1.2311). On the example inputs the hand route lands on 141.6 kg, 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 (Lombardi) if lift changes by 10 %?
The engine was re-run with that field moved by ten percent while everything else stayed fixed: the est. 1RM goes across 127.4 kg to 155.7 kg, a swing of roughly 10.0 % around the 141.6 kg baseline. That ratio is the practical definition of how much this input matters.
Is the One Rep Max (Lombardi) result of 141.6 kg good or bad?
Neither, on its own — the label “The power-law curve (exponent 0.10) reads 115 × 8 as 141.6 kg — Lombardi is the gentlest of the classic trio and the one that survives long grind sets best” is the band this figure falls in for the example inputs, and your own inputs will place you elsewhere on the same ladder. Judge the number against your history and your alternatives, and remember that a ten-percent error in Lift alone moves it by ≈10.0 %.
Can One Rep Max (Lombardi) be negative or empty?
Yes, and that is informative rather than broken: a negative One Rep Max (Lombardi) usually means the inputs encode an outflow or a shortfall, and the verdict band above labels exactly that situation instead of hiding it.
How often do I recheck One Rep Max (Lombardi)?
Whenever Lift (kg) changes materially, or on a deliberate block cycle (4–8 weeks is standard practice). A stale One Rep Max (Lombardi) under-programs strong athletes and over-programs tired ones.
Where does 0.10 come from?
Fitted to weightlifting-style data — the exponent is the shape constant, not a physiological law.
Best formula for squats?
For grinding squat sets 8–12, Lombardi tracks; for crisp sub-5 tests, Epley or Brzycki.
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 (Lombardi)
- Epley comparison
- 145.7 kg in the default One Rep Max (Lombardi) calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Brzycki comparison
- 142.8 kg for the One Rep Max (Lombardi) worked case; it sits next to the main result because it carries context the headline leaves out.
- Spread of the trio
- 1.2 kg in the default One Rep Max (Lombardi) calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Est. 1RM
- The primary output of this tool: 141.6 kg for the default inputs, computed exactly from 1RM = w × r^0.10.
- Worked example
- Every substitution in order, from the example inputs to 141.6 kg — the audit trail for the headline figure.
- Verdict band
- A named zone on the range of plausible results; the example inputs land in “The power-law curve (exponent 0.10) reads 115 × 8 as 141.6 kg — Lombardi is the gentlest of the classic trio and the one that survives long grind sets best”, and your inputs may not.
- Sensitivity (±10 %)
- How far the One Rep Max (Lombardi) 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 (Lombardi) model comes from
There is no black box on this page — the engine evaluates 1RM = w × r^0.10. Source of record: Lombardi 1989 power-law model. 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.
Treat the output as a precise answer to the question you typed: exact arithmetic, transparent formula, published source, no hidden rounding. The design constraint was set by usefulness rather than by comfort: an estimate you can interrogate beats an answer you have to trust.
What to do with your One Rep Max (Lombardi) next
Re-run the calculation with your own figures, stress the two most sensitive inputs by ±10 %, and only then act on the result.
This page was written for people who need one trustworthy number before their next decision, and the promise is that nothing above required trust. Bookmark the tool, re-run it whenever an input moves by more than a few percent, and keep the date with the number.