Sleep Time and Performance Calculator

Published on 1/10/2026
  • None of the values you enter are saved anywhere or sent outside this page. Feel free to try the tool.
  • Results are rounded to the nearest decimal place.
#sleep-cal table caption { caption-side: top; color: black; font-size: 18px; font-weight: bold; } #sleep-cal table th { width: 20%; text-align: left; } #sleep-cal table td { width: 80%; } #sleep-cal table td.auto { background: #dfffe4; display: table-cell; } #sleep-cal table td p { margin-bottom: 10px; } #sleep-cal table td p:last-child { margin-bottom: 0; } #sleep-cal table td .input-wrap { display: flex; margin-top: 20px; } #sleep-cal table td .input-result { font-size: 18px; width: 120px; text-align: right; padding-right: 10px; } #sleep-cal table td input[type=”range”] { width: 100%; -webkit-appearance: slider-horizontal; -moz-appearance: slider-horizontal; appearance: slider-horizontal; } #sleep-cal table td .number-input { font-size: 18px; width: 100px !important; display: inline-block; } #sleep-cal table td .score { font-size: 18px } #sleep-cal table td diff { }
Current sleep status
Sleep time
{{now.sleepTime}} hours
Active time You can include working hours as well as exercise, study, hobbies, and other activities.
{{now.activeTime}} hours
Performance at your current sleep duration Please set how much performance you can deliver now, using 100% to represent what you could do with ideal sleep.
{{now.performance}}%

Hourly value generated at that performance level
yen

Efficiency score (daily value) Active time [{{now.activeTime}} hours] x Value per hour [{{now.benefit}} yen] =
{{nowScore()}} yen
If you sleep your ideal amount
Sleep time Set the number of hours of sleep that would let you perform at 100%.
{{ideal.sleepTime}} hours
Active time Current active time [{{now.activeTime}} hours] – (Ideal sleep time [{{ideal.sleepTime}} hours] – Current sleep time [{{now.sleepTime}} hours])
{{now.activeTime-(ideal.sleepTime-now.sleepTime)}} hours
Performance with ideal sleep

100%

Hourly value
{{idealBenefit()}} yen
Efficiency score Active time [{{idealActiveTime()}} hours] x Value per hour [{{idealBenefit()}} yen] =
{{idealScore()}} yen {{diffScore()}}
const app = new Vue({ el: ‘#sleep-cal’, data: { now: { performance: 60, sleepTime: 4, activeTime: 11, benefit: 1000, score: 0 }, ideal: { sleepTime: 7, activeTime: 0, benefit: 0, score: 0 } }, methods: { nowScore: function () { const activeTime = this.now.activeTime; const benefit = this.now.benefit; return this.now.score = Math.round(activeTime * benefit); }, idealActiveTime: function () { this.ideal.activeTime = this.now.activeTime – (this.ideal.sleepTime – this.now.sleepTime); return this.ideal.activeTime; }, idealBenefit: function () { // Value gained from improved efficiency const boost = 100 / ((this.now.performance * 0.01) * 100); return this.ideal.benefit = Math.round(this.now.benefit * boost); }, idealScore: function () { return this.ideal.score = Math.round(this.ideal.activeTime * this.ideal.benefit); }, diffScore: function () { if (this.now.score < this.ideal.score) { const result = `(${this.ideal.score – this.now.score} yen gained by getting more sleep!)`; return result; } } } });

Author

Shinya Oishi

Shinya Oishi

A freelance designer and developer involved in promotion and public relations for a wide range of companies, organizations, and facilities. At Task Management Partner, responsible for business planning, website development, and illustration. Known for versatility and a wide-ranging skill set—including design, illustration, development, and content creation—I am capable of and interested in many things, which often leads to handling an overwhelming number of tasks. This service was created to address that challenge by having someone else review and help organize one’s tasks. As a service built on the principle of “selling what I myself truly need,” I confidently recommend it to anyone struggling with task management.

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