Incorrect calculation of weight

[firedev]

I always had the feeling that jumps between weights are irregular. And now I can put a finger on it. After deloading I have noticed that AMRAP set for TM 295 and TM 300 is the same - 285. But this is incorrect:

TM 295 * .95 = 280.25 — Should be AMRAP 280
TM 300 * .95 = 285 — Correct

I came to the suggestion that you are using ceil instead of floor when rounding. There is also a related issue about rounding to 5lbs #37

Here is my attempt at fixing it, the calculations are done in JavaScript so you can paste the code in your browser console:

TM	AMRAP	2.5lbs
295	280.25	280
300	285	285

Full table from TM 225 to TM 315

TM	2.5lbs	5lbs	AMRAP	2.5lbs	5lbs
255	255	255	242.25	240	235
260	260	255	247	245	245
265	265	265	251.75	250	245
270	270	265	256.5	255	255
275	275	275	261.25	260	255
280	280	275	266	265	265
285	285	285	270.75	270	265
290	290	285	275.5	275	275
295	295	295	280.25	280	275
300	300	295	285	285	285
305	305	305	289.75	285	285
310	310	305	294.5	290	285
315	315	315	299.25	295	295

const weights = Array(13).fill().map((_, x) => 255 + x * 5)
const bar = 45

const getRounding = to => (weight) => {
  const loaded = to * 2
  const rest = weight - bar
  const rate = Math.floor(rest / loaded)
  return loaded * rate + bar
}

const rounding2_5 = getRounding(2.5)
const rounding5_0 = getRounding(5)


const table = weights.map(weight => {
  const amrap = weight * 0.95
  return ({
    weight, 
    weightTwoFive: rounding2_5(weight), 
    wightFive: rounding5_0(weight),
    amrap,
    amrapTwoFive: rounding2_5(amrap), 
    amrapFive: rounding5_0(amrap),
  })
})

console.table(table, Object.keys(table[0]))

[JonnyBeeGod]

What is your smallest weight plate? The app takes the smallest weight plate into account in order to calculate weights which are possible to load with a 20 kg bar and with plates as low as your smallest plate.

[firedev]

2.5lbs (Recommended)

My point is that it should not round 95% of 295 to 285. It should be either 280 for 2.5lbs or 275 for 5lbs plates.