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Health & Lifestyle
Sleep cycles, password entropy and lifestyle calculators.
Sleep Cycle Bedtime & Wake Calculator
Bedtime and wake-up times aligned to 90-minute sleep cycles, accounting for fall-asleep latency.
Password Strength & Entropy Calculator
Calculate password entropy in bits and estimated brute-force time across attacker capabilities.
Bra Size Converter (UK / US / EU / AU / JP)
Convert bra sizes between UK, US, EU, AU and JP systems with sister sizes when band/cup doesn't fit.
Shoe Size Converter (US / UK / EU / JP / CN)
Convert shoe sizes between US, UK, EU, Japanese cm and Chinese systems for men, women and kids.