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26 free sleep calculators backed by peer-reviewed research. Chronotype quiz, caffeine cutoff, sleep cycles, nap timing, and more — better sleep, calculated.
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Hex Code
Color name
RGB
HSL
CMYK
#7C6AFF
Cornflower Blue
124, 106, 255
247, 100, 71
51, 58, 0, 0
#1E1B2E
Mirage
30, 27, 46
249, 26, 14
35, 41, 0, 82
#FFFFFF
White
255, 255, 255
0, 0, 100
0, 0, 0, 0
The Sleep Math is a free online resource that helps people make sense of their sleep through practical calculators, quizzes, guides, and articles. Its tools turn sleep-related questions into personalized estimates and recommendations, using information such as bedtime, wake time, caffeine habits, age, and travel plans. Visitors can explore their chronotype, calculate a caffeine cutoff, assess sleep debt and sleep quality, plan naps or sleep cycles, and map circadian rhythms.
Other tools cover jet lag, shift work, screen use, light exposure, exercise timing, room temperature, alcohol’s effects, and sleep hygiene. The site also offers resources for parents, including baby sleep needs, sleep regression, and pregnancy-related guidance, alongside clinical screening tools for insomnia severity and sleep apnea risk. The Sleep Math says its calculators are based on peer-reviewed research and cites published studies and clinical guidelines.
Most tools take less than a few minutes to complete, and no account is needed. The site also publishes sleep-focused content and offers a weekly email newsletter featuring new tools, research breakdowns, and product reviews
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Health
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How do I download the The Sleep Math logo?
The The Sleep Math logo comes in one version: a logo. Download as transparent PNG.
What are The Sleep Math's brand colors?
The The Sleep Math color palette uses the hex codes #7C6AFF, #1E1B2E and #FFFFFF.
The The Sleep Math name, logos and brand assets are trademarks of The Sleep Math and its affiliates. Brandfetch isn't affiliated with or endorsed by The Sleep Math. Their use is subject to The Sleep Math's brand guidelines.