Bathroom Lighting: Lumens & Fixture Count by Room Size

Target · why this figureWhat a bathroom is actually lit to

Even light on the face at the mirror matters more than ceiling brightness. Fixtures must carry an IP rating appropriate to their zone.

SOURCE·IES lumen-method recommendations·published recommendations, quoted as ranges·REVIEWED JUL 2026

Schedule · 60 footprintsEvery footprint, worked at 200 lux

Bathroom fixture counts by footprint COMPUTED · JUL 2026
Room size	Area	Total lumens	Fixtures	Grid
8 × 8 ft	64 sq ft	3,716 lm	4	2 × 2
8 × 10 ft	80 sq ft	4,645 lm	6	3 × 2
8 × 12 ft	96 sq ft	5,574 lm	6	3 × 2
9 × 9 ft	81 sq ft	4,703 lm	6	2 × 3
9 × 12 ft	108 sq ft	6,044 lm	9	3 × 3
10 × 10 ft	100 sq ft	5,682 lm	9	3 × 3
10 × 11 ft	110 sq ft	6,095 lm	9	3 × 3
10 × 12 ft	120 sq ft	6,502 lm	9	3 × 3
10 × 13 ft	130 sq ft	6,905 lm	9	3 × 3
10 × 14 ft	140 sq ft	7,304 lm	9	3 × 3
10 × 15 ft	150 sq ft	7,699 lm	12	4 × 3
10 × 16 ft	160 sq ft	8,092 lm	12	4 × 3
10 × 20 ft	200 sq ft	9,677 lm	12	4 × 3
11 × 11 ft	121 sq ft	6,526 lm	9	3 × 3
11 × 12 ft	132 sq ft	6,951 lm	9	3 × 3
11 × 13 ft	143 sq ft	7,370 lm	9	3 × 3
11 × 14 ft	154 sq ft	7,784 lm	9	3 × 3
12 × 12 ft	144 sq ft	7,391 lm	9	3 × 3
12 × 13 ft	156 sq ft	7,826 lm	9	3 × 3
12 × 14 ft	168 sq ft	8,261 lm	9	3 × 3
12 × 15 ft	180 sq ft	8,710 lm	12	4 × 3
12 × 16 ft	192 sq ft	9,154 lm	12	4 × 3
12 × 18 ft	216 sq ft	10,034 lm	12	4 × 3
12 × 20 ft	240 sq ft	10,903 lm	15	5 × 3
12 × 24 ft	288 sq ft	12,621 lm	18	6 × 3
13 × 13 ft	169 sq ft	8,285 lm	9	3 × 3
13 × 14 ft	182 sq ft	8,756 lm	12	4 × 3
13 × 15 ft	195 sq ft	9,221 lm	12	4 × 3
13 × 16 ft	208 sq ft	9,682 lm	12	4 × 3
14 × 14 ft	196 sq ft	9,243 lm	12	3 × 4
14 × 15 ft	210 sq ft	9,725 lm	12	4 × 3
14 × 16 ft	224 sq ft	10,201 lm	12	4 × 3
14 × 18 ft	252 sq ft	11,142 lm	15	5 × 3
14 × 20 ft	280 sq ft	12,136 lm	15	5 × 3
15 × 15 ft	225 sq ft	10,222 lm	12	3 × 4
15 × 16 ft	240 sq ft	10,713 lm	16	4 × 4
15 × 18 ft	270 sq ft	11,731 lm	16	4 × 4
15 × 20 ft	300 sq ft	12,802 lm	16	4 × 4
16 × 16 ft	256 sq ft	11,218 lm	16	4 × 4
16 × 18 ft	288 sq ft	12,347 lm	16	4 × 4
16 × 20 ft	320 sq ft	13,459 lm	20	5 × 4
16 × 22 ft	352 sq ft	14,558 lm	20	5 × 4
16 × 24 ft	384 sq ft	15,647 lm	20	5 × 4
17 × 17 ft	289 sq ft	12,373 lm	16	4 × 4
18 × 18 ft	324 sq ft	13,559 lm	16	4 × 4
18 × 20 ft	360 sq ft	14,751 lm	20	5 × 4
18 × 22 ft	396 sq ft	15,926 lm	20	5 × 4
18 × 24 ft	432 sq ft	17,130 lm	20	5 × 4
20 × 20 ft	400 sq ft	16,018 lm	20	4 × 5
20 × 22 ft	440 sq ft	17,335 lm	25	5 × 5
20 × 24 ft	480 sq ft	18,637 lm	25	5 × 5
20 × 30 ft	600 sq ft	22,477 lm	28	7 × 4
22 × 22 ft	484 sq ft	18,735 lm	25	5 × 5
22 × 24 ft	528 sq ft	20,118 lm	25	5 × 5
24 × 24 ft	576 sq ft	21,577 lm	30	5 × 6
24 × 30 ft	720 sq ft	26,129 lm	35	7 × 5
25 × 25 ft	625 sq ft	23,133 lm	30	5 × 6
26 × 26 ft	676 sq ft	24,725 lm	30	5 × 6
28 × 28 ft	784 sq ft	28,014 lm	36	6 × 6
30 × 30 ft	900 sq ft	31,433 lm	42	6 × 7

At 800 lumens per fixture, 8 ft ceiling. A 12 × 14 ft bathroom is the reference case: 9 fittings, 3 × 3, 4.7′ centres.

SOURCE·Computed from the lumen method·no dataset, every figure reproducible with a calculator·REVIEWED JUL 2026

Kitchen 300–500 lxLiving room 150–300 lxBedroom 100–200 lxHome office 400–500 lxDining room 150–300 lxGarage 150–300 lxHallway 100–200 lxLaundry 200–300 lxBasement 150–300 lxWorkshop 500–750 lxNursery 100–200 lx

Bathroom lighting

Target · why this figureWhat a bathroom is actually lit to

Schedule · 60 footprintsEvery footprint, worked at 200 lux

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Bathroom lighting

Target · why this figureWhat a bathroom is actually lit to

Schedule · 60 footprintsEvery footprint, worked at 200 lux

AdjacentThe other eleven targets in the same house

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