Simple Interest Calculator

Calculate simple interest on loans and investments. Enter principal amount, annual interest rate, and time period in years, months, or days. This free simple interest calculator shows total interest earned and final amount.

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Tools|Simple Interest|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.