Blood Donation Time Calculator - Calculate your next eligible blood donation date based on donation type. Track whole blood, plasma, platelet, and double red cell donations with personalized countdown and eligibility guidelines. Featured
Blood Sugar Converter - Convert blood sugar levels between mg/dL (US) and mmol/L (UK/International) with instant results, diabetes risk assessment, visual range indicators, and comprehensive glucose reference charts.
Caffeine Overdose Calculator - Calculate your safe daily caffeine limit based on body weight, then see the equivalent in espresso shots, cups of coffee, energy drinks (Monster, Red Bull), tea, and more. Includes animated drink visualizations and a danger zone meter. New
Coffee vs. Sleep Calculator - Compare the alertness boost from coffee versus a power nap. See peak alertness timing, caffeine crash window, and which option gives you better sustained focus based on sleep science and caffeine pharmacokinetics. New
How Much Water to Drink A Day? - Calculate your personalized daily water intake based on weight, activity level, climate, and health factors. Get a visual hydration plan with hourly schedule and tips.
How Much Weight Should I Lose? - Find out how much weight you should lose based on BMI analysis, get a safe weight loss timeline, calorie deficit plan, and personalized milestones to reach your healthy weight range.
Macro Calculator - Calculate Your Daily Macros for Any Goal - Calculate your optimal daily macronutrient needs with our advanced macro calculator. Get personalized protein, carbs, and fat targets based on your body, activity level, and fitness goals.
Sleep Calculator - Calculate optimal sleep and wake times based on 90-minute sleep cycles. Get personalized recommendations for your age group and track sleep debt.
Water Intake Calculator - Calculate your personalized daily water intake based on body weight, activity level, and climate. Get a visual glass tracker and hourly drinking schedule.
All MiniWebtools