All Tools VerseUS Navy Body Fat Method: Tape Measure Accuracy
Estimate body fat with a tape measure: the published Navy formulas, worked examples for both sexes, and the technique that makes the number trustworthy.
Blog
Ideal Weight Formulas Compared (Devine, Robinson...)
Four formulas, four different ideals up to 5.8 kg apart, and the surprising history: the most famous one was invented for drug dosing, not health.
Pace Calculator Guide: Race Times and Training Zones
From a 25-minute 5K to a marathon plan: pace math, Riegel predictions, the training paces that build speed, and why the second half should be faster.
Calorie Deficit: How Big Is Safe and Effective
How to size a calorie deficit: the calories-to-fat exchange rate, small vs moderate vs aggressive, and the floors that keep a cut healthy.
TDEE Explained: Find Your Real Daily Burn
The activity multiplier table with honest definitions, the NEAT factor everyone forgets, and the two-week audit that beats every formula.
BMR, TDEE and Calories: How Your Body Burns Energy
The three numbers behind every diet: BMR, TDEE, and the calorie balance, worked end to end with real figures and the common errors that bend them.
How Much to Save for Retirement (Calculator Math)
Three chained calculations turn retirement anxiety into a number: the target, the inflation correction, and the monthly price of each decade of delay.
ROI: How to Calculate Return on Investment
The single-division formula everyone quotes and the three silent decisions inside it: gain, cost, and time, with worked examples.
Margin vs Markup: Stop Confusing Them
One product, two percentages: why a 40% margin is a 66.7% markup, and how applying the wrong one quietly costs seven points of profit.
Hourly to Annual Salary: Convert Pay the Right Way
Convert between hourly pay and annual salary in both directions, and catch the assumptions that make two similar offers very different.
How Inflation Eats Your Savings (With Numbers)
The erosion table for idle money, the real-return formula, and why a plan that ignores inflation aims at half the true target.
Debt Snowball vs Avalanche: Which Pays Off Faster
Snowball or avalanche? One realistic three-debt example simulated month by month shows the real gap in time, interest, and motivation.