Free Online Calculators - BMI, Calorie, Age & More

Free online calculators for health, fitness, and daily life. BMI, calorie, macro, age, and tip calculators.

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BMI Calculator

Calculate your Body Mass Index with health category classification.

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Calorie Calculator

Estimate daily calorie needs based on activity level and goals.

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Macro Calculator

Calculate protein, carbs, and fat distribution for your diet.

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Age Calculator

Calculate exact age in years, months, days, and next birthday.

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Tip Calculator

Calculate tip amount and split the bill among friends.

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Percentage Calculator

Calculate percentages, percentage change, and increase/decrease instantly.

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Loan Calculator

Calculate monthly payments, total interest, and amortization for any loan.

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Scientific Calculator

Advanced calculator with trigonometry, logarithms, exponents, and more.

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Date Calculator

Calculate the difference between two dates or add/subtract days from a date.

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Guides & Tutorials

BMI for Athletes: Why the Standard Scale Is Wrong for You → BMI Chart Explained: What Your Number Actually Means (And When It's Wrong) → Calorie Deficit Explained: How Many Calories to Cut for 1lb Per Week → Calorie Deficit Calculator: How Much to Eat for Safe Weight Loss → Protein, Carbs, Fat: The Complete Macro Splitting Guide for Your Goal → Vegetarian Protein Calculator: How to Hit Your Macros Without Meat → Age Calculator: How to Calculate Your Exact Age in Years, Months, and Days →