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Guides and articles to get the most out of our tools.
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- Fitness
How Many Calories Should You Eat? BMR, TDEE, and a Real Example
See the BMR and TDEE formula, a full worked example, and how activity level and sex change your daily calorie target.
July 4, 2026 - Fitness
How Much Water Should You Drink a Day? A Real Formula
Weight-based daily water intake formula with a worked example and a full reference table by body weight, activity, and climate.
July 4, 2026 - Calculators
How Old Am I? The Exact Age Formula (Years, Months, Days)
Find out exactly how old you are with a free age calculator. Learn the real formula behind 'how old am I' in years, months and days, with a worked example.
July 4, 2026 - Calculators
How to Calculate Aspect Ratio (Formula, Common Ratios, and Resizing Without Distortion)
The aspect ratio formula, a cheat sheet of common video and social ratios, and how to resize an image without stretching it. Free calculator included.
July 4, 2026 - Fitness
How to Calculate Your Body Fat Percentage (US Navy Method)
Learn the US Navy body fat formula, see a full worked example, and find your category. Free calculator included.
July 4, 2026 - Productivity
How to Calculate Days Between Two Dates (With Worked Examples)
Find the exact days, weeks, or months between two dates and see why a 'year' isn't always 365 days. Free date difference calculator included.
July 4, 2026 - Fitness
How to Calculate Running Pace (With a Real Example)
Learn the running pace formula, see a full worked example in km and miles, and check a race-time table for 5K to marathon. Free calculator included.
July 4, 2026 - Finance
How to Calculate VAT (Add or Remove Tax From Any Price)
The VAT add and remove formulas, a worked invoice example, a UK rate table, and the mistakes that throw off a tax return. Free calculator included.
July 4, 2026