Time Duration Calculator

Calculate the exact time duration between two dates and times. Enter start and end datetime to get the difference in years, days, hours, minutes, and seconds. This free time duration calculator is perfect for project tracking, work hours, and elapsed time measurement.

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Tools|Duration|Date|Convert|hello-tools 2026

Calorie Calculator - BMR, TDEE, BMI & Macro Calculator - Free Online

Free online calorie calculator: calculate BMR (Basal Metabolic Rate), TDEE (Total Daily Energy Expenditure), BMI, and macronutrients (protein, carbs, fat) for weight loss, weight maintenance or muscle gain. Uses Mifflin-St Jeor equation. Mac OS 9 retro style.

Free online tool. hello-tools offers free, easy-to-use web tools. Calculators, converters, generators, and more — all in Mac OS 9 retro style. No signup required, no data stored.