Track your weight loss in stones and pounds
This calculator provides estimates only. Consult your GP or a healthcare professional for personalised advice.
In the United Kingdom, most people think about their body weight in stones and pounds rather than kilograms. While the metric system is used in healthcare settings and by the NHS, everyday conversation still revolves around stones. This calculator is designed specifically for UK users who want to track their weight loss in the units they are most familiar with, while also providing metric conversions for medical appointments and fitness tracking apps. Tracking weight loss in stones and pounds can feel more tangible and motivating. Saying "I have lost a stone and a half" resonates more with most British people than "I have lost 9.5 kilograms." This calculator takes your starting and current weights in stones and pounds, computes the total loss, converts everything to kilograms for reference, and shows your loss as a percentage of your starting weight. The calculator also produces a pie chart showing the proportion of your starting weight that you have lost versus your current weight. This visual representation can be a powerful motivator, especially when the weekly changes on the scales feel small but the cumulative progress is significant.
To use this calculator: 1. Enter your starting weight in stones and pounds. For example, if you started at 14 stone 3 pounds, enter 14 in the stones field and 3 in the pounds field. The pounds field accepts values from 0 to 13 (since 14 pounds equals 1 stone). 2. Enter your current weight in stones and pounds in the same way. 3. The calculator will display: - Your total weight lost in stones and pounds (e.g. "1 st 7 lb") - Your total weight lost in kilograms - Your weight loss as a percentage of your starting weight - Your starting and current weights converted to kilograms 4. Use the pie chart to visualise how much of your original weight you have lost. 5. For medical appointments, use the kilogram values. The NHS uses kilograms in clinical settings, so having both units to hand is helpful.
The calculation works by converting everything to pounds first, then performing the arithmetic: Start Total Pounds = (Start Stones x 14) + Start Pounds Current Total Pounds = (Current Stones x 14) + Current Pounds Lost Pounds = Start Total Pounds - Current Total Pounds The result is then broken back down into stones and pounds: Lost Stones = floor(Lost Pounds / 14) Lost Remaining Pounds = Lost Pounds mod 14 For metric conversion: Lost Kilograms = Lost Pounds x 0.453592 For percentage: Percentage Lost = (Lost Pounds / Start Total Pounds) x 100 For example, going from 14 stone 0 pounds to 12 stone 7 pounds: Start Total Pounds = (14 x 14) + 0 = 196 lbs Current Total Pounds = (12 x 14) + 7 = 175 lbs Lost Pounds = 196 - 175 = 21 lbs = 1 stone 7 pounds Lost Kilograms = 21 x 0.454 = 9.5 kg Percentage = (21 / 196) x 100 = 10.7% Common conversion reference: - 1 stone = 14 pounds = 6.35 kg - 1 pound = 0.454 kg - 1 kg = 2.205 pounds
Inputs: Starting Weight: 14 st 0 lb, Current Weight: 12 st 7 lb
Inputs: Starting Weight: 16 st 8 lb, Current Weight: 15 st 4 lb
Inputs: Starting Weight: 11 st 0 lb, Current Weight: 11 st 0 lb
The stone is a unit of weight used primarily in the United Kingdom and Ireland. While the NHS officially uses kilograms in clinical practice, most GP surgeries will convert for patients who prefer stones. If you are tracking your weight using a fitness app or smart scales, they may default to kilograms, so having the conversion readily available is helpful. The NHS weight loss plan is free and provides a 12-week structured programme to help you lose weight safely at 0.5 to 1 kg per week. Reducing your calorie intake by 500 kcal per day typically results in a loss of about 0.5 kg (roughly 1 lb) per week.