Weight Management
Weight Loss Calculator
How long weight loss will take at your calorie deficit, with a week-by-week projection and goal date.
Days = kg to lose × 7,700 ÷ daily deficit
Also called how long to lose weight · weight loss timeline
Health & Fitness · 9 calculators
Weight Management Calculators
Weight loss and gain timelines, calorie deficits, goal weights, body fat, lean mass and weight change.
Weight Management
Weight Gain Calculator
Calories and time needed to reach a higher goal weight, with a realistic weekly gain rate.
Weeks = kg to gain ÷ weekly gain rate
Also called how to gain weight · weight gain timeline
Weight Management
Calorie Deficit Calculator
Daily calorie deficit needed to lose a target weight by a date, and how long your chosen deficit will take.
Deficit = kg to lose × 7,700 ÷ days
Also called deficit calculator · calories to lose weight
Weight Management
Weight Goal Calculator
Check whether a goal weight is realistic for your height and by when you can reach it at a safe rate.
Weeks = |current − goal| ÷ weekly change
Also called goal weight calculator · target weight
Weight Management
Ideal Weight Calculator
Ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI range for your height.
Devine: 50 kg (male) / 45.5 kg (female) +…
Also called ibw calculator · healthy weight for height
Weight Management
Body Fat Calculator
Body fat percentage from the US Navy tape method, with fat mass, lean mass and your fitness category.
US Navy method using log of waist, neck (…
Also called body fat percentage · navy body fat
Weight Management
Lean Body Mass Calculator
Lean body mass (fat-free mass) by the Boer, James and Hume formulas, or from a known body-fat percentage.
Boer (male): 0.407·kg + 0.267·cm − 19.2
Also called lbm calculator · fat free mass
Weight Management
Weight Change Percentage Calculator
Percentage of body weight lost or gained between two weigh-ins, and the change per week.
% change = (now − start) ÷ start × 100
Also called percent weight loss · body weight percentage change
Weight Management
Weight / Mass Converter
Convert between 11 weight / mass units including micrograms, milligrams, grams, carats and more. Accurate factors, instant results.
Also called weight / mass unit converter · weight / mass conversion
Key weight management formulas
| Weight Loss | Days = kg to lose × 7,700 ÷ daily deficit |
|---|---|
| Weight Gain | Weeks = kg to gain ÷ weekly gain rate |
| Calorie Deficit | Deficit = kg to lose × 7,700 ÷ days |
| Weight Goal | Weeks = |current − goal| ÷ weekly change |
| Ideal Weight | Devine: 50 kg (male) / 45.5 kg (female) + 2.3 kg per inch over 5 ft |
| Body Fat | US Navy method using log of waist, neck (and hip) circumferences and height |
| Lean Body Mass | Boer (male): 0.407·kg + 0.267·cm − 19.2 |
| Weight Change Percentage | % change = (now − start) ÷ start × 100 |
Weight Management questions
What is the difference between a US ton and a metric tonne?
A US short ton is 907.18 kg, a metric tonne is 1,000 kg and a UK long ton is 1,016 kg.