Chin-up one-rep max calculator

Enter a chin-up set you actually did. Epley, the formula the app uses, turns it into an estimated 1RM (e1RM); Brzycki gives a second opinion, and the table below it turns the max into working weights.

For the chin-up the load is your bodyweight plus anything added (belt, vest, dumbbell): e1RM = (bodyweight + added) × (1 + reps / 30), and the level is that ÷ bodyweight. Enter the total: bodyweight plus what you added.

Total load (bodyweight + added) Reps

Unit

kg lb

Estimated 1RM (Epley, as in the app)

105 kg

Brzycki says 101.25 kg

Percentages of that max

For programming off a percentage. The rep column is what Epley says a set at that load is worth to failure. Rounded to 0.5.

% of 1RM	Weight	Reps to failure
100 %	105 kg	1
95 %	100 kg	1.6
90 %	94.5 kg	3.3
85 %	89.5 kg	5.3
80 %	84 kg	7.5
75 %	79 kg	10
70 %	73.5 kg	12.9
65 %	68.5 kg	16.2
60 %	63 kg	20
55 %	58 kg	24.5
50 %	52.5 kg	30

Where that max puts you

Compare the e1RM with the chin-up strength standards: an 80 kg man is Intermediate from bodyweight + 24 kg, a 60 kg woman from bodyweight + 12 kg. The page has the full table by bodyweight and a calculator that takes the same set.

Chin-up e1RM by total load and reps

Rows are total load, bodyweight plus added weight. Epley e1RM for each total load (rows) and rep count (columns), rounded to 0.5. The formula has no unit, so read the same table in lb.

Total load	1 rep	2 reps	3 reps	4 reps	5 reps	6 reps	7 reps	8 reps	9 reps	10 reps	11 reps	12 reps
40 kg	40	42.5	44	45.5	46.5	48	49.5	50.5	52	53.5	54.5	56
50 kg	50	53.5	55	56.5	58.5	60	61.5	63.5	65	66.5	68.5	70
60 kg	60	64	66	68	70	72	74	76	78	80	82	84
70 kg	70	74.5	77	79.5	81.5	84	86.5	88.5	91	93.5	95.5	98
80 kg	80	85.5	88	90.5	93.5	96	98.5	101.5	104	106.5	109.5	112
90 kg	90	96	99	102	105	108	111	114	117	120	123	126
100 kg	100	106.5	110	113.5	116.5	120	123.5	126.5	130	133.5	136.5	140
110 kg	110	117.5	121	124.5	128.5	132	135.5	139.5	143	146.5	150.5	154
120 kg	120	128	132	136	140	144	148	152	156	160	164	168
130 kg	130	138.5	143	147.5	151.5	156	160.5	164.5	169	173.5	177.5	182
140 kg	140	149.5	154	158.5	163.5	168	172.5	177.5	182	186.5	191.5	196
150 kg	150	160	165	170	175	180	185	190	195	200	205	210
160 kg	160	170.5	176	181.5	186.5	192	197.5	202.5	208	213.5	218.5	224
170 kg	170	181.5	187	192.5	198.5	204	209.5	215.5	221	226.5	232.5	238
180 kg	180	192	198	204	210	216	222	228	234	240	246	252
190 kg	190	202.5	209	215.5	221.5	228	234.5	240.5	247	253.5	259.5	266
200 kg	200	213.5	220	226.5	233.5	240	246.5	253.5	260	266.5	273.5	280

The formulas

Epley: e1RM = weight × (1 + reps / 30). Brzycki: e1RM = weight × 36 / (37 − reps). A single is taken at face value by both. They agree closely near 10 reps and drift apart below and above; past about 10 reps either is a rough guess. Beatweek uses Epley everywhere: PRs, the strength level, the e1RM trend.

In the app every logged chin-up set is checked for four PRs: e1RM, max weight, reps at a weight and session volume. The trend is split into the rep buckets 1–5, 6–10 and 11+, so a 5-rep PR and a 12-rep PR are not confused for each other.

Sets that count as chin-up: Chin-Up, Weighted Chin-Up.

PRs the moment they happen

Log a set and the row tints yellow when it beats your e1RM. Free for every lift; the by-rep-range trend is Pro.

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