Browse every sleep & recovery tool in one place. Compare workflows, open individual calculators and utilities, and keep your internal linking consistent across the category.
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Calculate your accumulated sleep debt from your weekly sleep log, assess your debt severity level, estimate recovery time, and understand the cognitive and health impacts. Enter how many hours you slept each night versus your recommended need to get a personalised recovery plan, performance impact analysis, health risk summary, and science-backed sleep tips.
Find the perfect bedtime or wake-up time by calculating sleep windows in complete 90-minute cycles. Choose a target wake-up time to get ideal bedtimes, plan your wake-up from a set bedtime, or calculate optimal wake times if you sleep now. Avoid sleep inertia and wake refreshed every morning.
Find the optimal wake-up times based on when you go to sleep. Enter your bedtime or use the current time to calculate perfect alarm times aligned with complete 90-minute sleep cycles. See nap options, avoid mid-cycle grogginess times, and get a personalised sleep tip.
Estimate likely REM sleep time from total sleep hours, age group, sleep continuity, night awakenings, and late-night disruptors. Review estimated REM minutes, REM percentage, late-night REM, and practical recovery notes.
Calculate sleep efficiency from time in bed, sleep latency, time awake during the night, and early final waking. Review actual sleep time, total wake time, and whether your sleep efficiency falls in a healthy range.
Calculate a practical sleep score from sleep duration, sleep latency, awakenings, daytime energy, and schedule consistency. Review the overall score, score band, factor breakdown, and actionable guidance.
Choose the best nap length for alertness, focus, recovery, or a full-cycle nap. Review suggested nap duration, wake-up time, sleep inertia risk, and practical nap planning guidance.
Estimate jet lag recovery time from time zones crossed, travel direction, and chronotype. Review adjustment days, light exposure timing, nap guidance, caffeine timing, and practical recovery notes.
Format, validate, minify, or sort JSON data with configurable indentation. Instantly check for syntax errors, view node count and nesting depth — free, no sign-up required.
Generate QR codes for URLs, text, Wi-Fi credentials, vCards, and more. Customise foreground and background colour, error correction level, margin, and download as SVG or PNG — free and instant.
Calculate your Body Mass Index, healthy weight range and ideal weight using metric or imperial units.
Estimate daily calorie needs based on age, gender, height, weight and activity level using Mifflin-St Jeor, Harris-Benedict or Katch-McArdle formulas.