RTS Calculator
The formula
What the top-set frame tells you
Sheiko’s Eastern-European school as practiced in the West: fixed percentage bands, RPE decides the day, back-offs at 95/90/85 of the top.
Calculation: Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top. Enter your inputs and every substitution is shown below the result.
Reading the result
You never miss on purpose — the band caps ambition and the RPE scales it to the actual lifter that morning.
Rules of thumb: Westside/RIS-style sessions: one top + three back-off sets per lift
Limitations and best practice
Lying to RPE. The method collapses the moment perceived effort drifts upward.
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
Why percentage bands at all?
Same for all lifts?
Source & methodology
Westside RTS convention; Sheiko school.
RTS: what this tool answers
This page was written for one job: turning your own inputs into a defensible figure, with the working shown. RTS is the kind of number people argue about from memory. This page ends that argument with arithmetic you can watch happen: enter your figures, get Top set in real time, and see every substitution printed below.
Training math in Fitness & Sports converts effort into load, and load into adaptation. RTS does the conversion: Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top. Athletes who understand their numbers progress faster because they can separate programming from recovery — and the 174.9 kg result above is exactly that separator.
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 RTS.
Nothing below is stock text pasted around a number: the worked example computes top set = 174.9 kg from this tool’s own defaults, and the sensitivity section ranks the inputs that move the result — Competition max 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 RTS is computed, line by line
One formula, published in full: Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top. 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.
Competition max (kg) (example value 170) is a plain measured quantity — the unit shown in the label is the unit the formula expects. Use the same conditions each time (same scale, same time of day) so that changes in the output reflect real change.
Top-set band (example value 80 %) is a selector, not a measurement: the engine follows a different route for each option. This input feeds the formula directly; a defensible figure here is worth more than false precision anywhere else.
RPE cap (example value 7) is a numeric input whose unit is fixed by the label; a wrong unit is a wrong answer wearing a plausible disguise. This input feeds the formula directly; a defensible figure here is worth more than false precision anywhere else.
What each “Top-set band” choice actually does: 70 % → 153.1 kg · 75 % → 164.0 kg · 80 % → 174.9 kg · 85 % → 185.9 kg · 90 % → 196.8 kg These figures are computed from this engine, not estimated — switch the dropdown above and you will land on exactly these numbers.
RTS 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: Competition max (kg), Top-set band, RPE cap. Run to the end, the top set resolves to 174.9 kg — At RPE 7.5 the 80 % band asks for about 174.9 kg on the top set, then 95/90/85 % back-offs (166/157/149) — the whole method is autoregulation inside a fixed frame on the bands this tool uses.
- Band load = 170 × 0.80 = 136.0
- RPE 7.5 adjusts the frame load → 174.9
- Back-offs: 166.2 / 157.5 / 148.7
Back-off 95 % — 166.2 kg. This is the number experienced users quote when the headline alone would mislead.
Back-off 90 % — 157.5 kg. Compare it against the main result of 174.9 kg before drawing conclusions.
Back-off 85 % — 148.7 kg. Compare it against the main result of 174.9 kg before drawing conclusions.
RPE 9 target — 163.6 kg. Compare it against the main result of 174.9 kg before drawing conclusions.
Overwrite any input above and every line of this example updates with it — the substitution is live, not a screenshot of somebody else’s numbers.
The RTS corridor: your result across a realistic band
The honest version of any estimate is a corridor, and this one is cheap to produce: RTS was recomputed at 5 points along the dominant input, with every other field left untouched.
| Competition max setting | Top set |
|---|---|
| 80 % of the example value | 140.0 kg |
| 90 % of the example value | 157.5 kg |
| example inputs | 174.9 kg |
| 110 % of the example value | 192.4 kg |
| 120 % of the example value | 209.9 kg |
The corridor runs from 140.0 kg to 209.9 kg across that band — which is the range worth planning inside rather than the single 174.9 kg point estimate. Reproduce it in the form above by editing Competition max alone; the substitution steps will follow your figures exactly.
The levers behind RTS, ranked by effect
Generic advice says “it depends on your inputs”; this section says exactly how much. Each field was perturbed by ±10 % in isolation and the top set recomputed, so the ranking below is measured rather than asserted. Read it as a map of where RTS is fragile — drawn for the example inputs, which is the map you want when deciding what to measure carefully.
- Competition max +10 % → RTS = 192.4 kg · −10 % → 157.5 kg (the top set shifts ≈10.0 %)
- RPE cap +10 % → RTS = 160.9 kg · −10 % → 192.1 kg (the top set shifts ≈9.8 %)
Competition max is the dominant lever here: ten percent either way moves the result by about 10.0 %, from 157.5 kg to 192.4 kg. Spend your verification effort there first, and RPE cap is effectively tied with it (≈9.8 % for the same nudge), so verify the pair together. Everything below that can stay approximate, which is a licence to stop chasing data that would not change the decision.
Is your RTS good — reading the result bands
Nobody acts on a bare figure — they act on a figure with a comparison attached. On the example inputs the band reads “At RPE 7.5 the 80 % band asks for about 174.9 kg on the top set, then 95/90/85 % back-offs (166/157/149) — the whole method is autoregulation inside a fixed frame”; your own figures place you on a different rung of the same ladder. The sensitivity list shows how far a modest input error moves you along that ladder: for Competition max, ±10 % covers 157.5 kg to 192.4 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, RTS is one instrument in an orchestra: on its own it is a number, next to Back-off 95 % and Back-off 90 % it becomes a diagnosis. The tools linked above exist so the headline never has to carry that weight alone.
How people get RTS wrong
Lying to RPE. The method collapses the moment perceived effort drifts upward. 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.
Reporting the headline and quietly discarding Back-off 95 %. The companions are where the shape of the trade-off survives the rounding.
One mistake is specific to this engine: assuming every input matters equally. The computation above shows Competition max dominating — a careful figure there beats false precision everywhere else.
Another is comparing across contexts: an RTS 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.
RTS verification checklist
- Note the date and the inputs beside the number so the figure can be audited later.
- State, in one sentence, which convention each rate, unit or period in the form is using.
- Check Competition max before anything else: it is the measured dominant input, ≈10.0 % of RTS per ten percent.
- Verify each input against its original source document, not memory.
- Recompute once with the dominant input deliberately set low, and see whether the decision changes.
- Confirm the answer against one independent method or published benchmark for RTS.
A routine for decision-grade RTS
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 — gather before you type. RTS depends on competition max (kg), top-set band, rpe cap. Collect them from a source document — a statement, a report, an invoice, a log — rather than from memory, because recalled inputs are the single largest cause of wrong results. Rounding early is the quietest way to introduce a permanent error.
Step 2 — baseline before exploration. Get one defensible Top set on screen before you start nudging numbers. Without a baseline, every variation looks interesting and none of them means anything. The fastest sanity test is to guess the answer first and see how far the calculation disagrees.
Step 3 — isolate your variables. Change one field, observe, revert. The live sensitivity list does the ranking for the default inputs; verify it against your own, because dominance shifts when the starting point shifts. Write the figure down before moving on; memory flatters whichever number you saw last.
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. Compare the calculation to the rough guess you arrived with, and ask why they differ.
Step 5 — save the story with the figure. A number without its inputs and its date is unusable within a quarter. Record 174.9 kg, the assumptions behind it, and today’s date; your future self will be auditing a stranger’s arithmetic. Rounding early is the quietest way to introduce a permanent error.
Who actually uses RTS — and when
In Strength Training the figure computed here is usually the first one somebody asks to see. Having it — with the formula behind it — changes your position in the conversation from participant to reference. A result worth acting on survives having its two shakiest inputs halved.
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 RTS, then invest slow analysis only in whatever survives the screen. Comparisons are cheap: run the identical calculation for the alternative and look at the gap.
Treat RTS like a smoke alarm rather than a painting — its value is in being tested periodically, not in being admired once. If a result feels obviously right, that is the moment to check the inputs hardest.
The questions that come up most about RTS
What affects RTS the most?
RTS is driven above all by Competition max. Perturbing only that field by ten percent either way produced 192.4 kg against the 174.9 kg baseline — a ≈10.0 % response, while RPE cap manages ≈9.8 %.
Do rpe cap and competition max matter equally?
RTS here is co-driven: Competition max and RPE cap produced ≈10.0 % and ≈9.8 % responses, which is a tie for practical purposes. Everything below those two is a rounding error by comparison.
How much does the “Top-set band” choice change the answer?
A great deal, on these inputs: RTS comes out at 153.1 kg on the lowest option (“70 %”) and 196.8 kg on the highest (“90 %”). Each option is listed with its computed value so you can see what the choice is worth before you make it.
What is a typical RTS?
There is no honest universal average for RTS, but there is a reference point: the defaults on this page produce 174.9 kg (At RPE 7.5 the 80 % band asks for about 174.9 kg on the top set, then 95/90/85 % back-offs (166/157/149) — the whole method is autoregulation inside a fixed frame). Replace the inputs with your own and compare — that comparison is the useful meaning of “typical”.
How do I calculate RTS by hand?
Use the stated model — Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top — and substitute in the order the tool prints (it starts from Band load = 170 × 0.80 = 136.0). On the example inputs the hand route lands on 174.9 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 RTS if competition max changes by 10 %?
On these inputs a ±10 % change in competition max takes RTS to 192.4 kg against the 174.9 kg example — around 10.0 % of the headline. The same test on every other field is in the sensitivity section.
Is the RTS result of 174.9 kg good or bad?
Good and bad are comparisons, so the honest test is three questions: where does your own RTS sit against the 174.9 kg reference above, how far would a plausible input error move it (≈10.0 % per ten percent on Competition max), and what does the alternative option compute to?
How often do I recheck RTS?
Whenever Competition max (kg) changes materially, or on a deliberate block cycle (4–8 weeks is standard practice). A stale RTS under-programs strong athletes and over-programs tired ones.
Is RTS accurate?
The arithmetic is exact: Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top 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 174.9 kg result as the correct answer to the question you typed — and check the assumptions section before acting on it.
Why percentage bands at all?
They prevent the max-effort treadmill; the band is the program, the RPE is the steering.
Same for all lifts?
Yes — squat, bench, deadlift each get their own top/back-off slot.
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 RTS
- Back-off 95 %
- 166.2 kg in the default RTS calculation — one of the secondary figures an experienced reader checks before trusting the primary number.
- Back-off 90 %
- 157.5 kg for the RTS worked case; it sits next to the main result because it carries context the headline leaves out.
- Back-off 85 %
- 148.7 kg on the example inputs — a companion figure printed beside the headline of RTS so that no result is read in isolation.
- Top set
- The primary output of this tool: 174.9 kg for the default inputs, computed exactly from Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top.
- Worked example
- Every substitution in order, from the example inputs to 174.9 kg — the audit trail for the headline figure.
- Verdict band
- The interpretation attached to a result (“At RPE 7.5 the 80 % band asks for about 174.9 kg on the top set, then 95/90/85 % back-offs (166/157/149) — the whole method is autoregulation inside a fixed frame” on these inputs), which turns a bare number into a position on a scale.
- Sensitivity (±10 %)
- How far the RTS 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 RTS model comes from
The model is published arithmetic implemented exactly as written: Top set = %max × RPE-adjusted; back-offs 95/90/85 % of top. Source of record: Westside RTS convention; Sheiko school. Any other implementation of this model should return the same figure for the same inputs. If one does not, the difference is in its assumptions — which this page prints and that one probably does not.
Nothing here replaces a qualified professional, and nothing here is approximate either — the arithmetic is exact, and the honesty is in the inputs you supply. The promise to the reader is narrow and testable: same inputs, same output, no silent rounding, and no figure presented without the formula that produced it.
After the number: what to do with it
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.