About FitCalcs

FitCalcs is a UK fitness, body and diet calculator site built on official data. We are an independent editorial and information service, operated by Best Business Loans Ltd (company number 16833937). Every tool shows its working, sources are cited on every figure, and health-related tools are editorially reviewed, with health figures cited to named UK sources such as the NHS, NDNS and Sport England.

What we cover

We answer the body, diet and training questions people actually search for, and we answer them with honest tools rather than opinions. That spans calorie and TDEE, BMI and waist-to-height, macros and protein, running pace and race-time prediction, heart-rate zones and strength standards. Alongside the calculators sit data pages that show how you compare to the UK population, built on the NHS Health Survey for England, Sport England Active Lives, the National Diet and Nutrition Survey, and public parkrun and London Marathon results.

How we work

Every tool shows its working: the exact equation it uses, such as Mifflin-St Jeor, Riegel or Karvonen, and the official UK source behind any benchmark, whether that is the NHS, Sport England, the NDNS or gov.uk. Health content is informational only, not medical advice, and is editorially reviewed, with health figures cited to named UK sources such as the NHS, NDNS and Sport England. We are clear about the limits of any estimate and when to speak to your GP, a registered dietitian or NHS 111. We do not sell products or services, we run no lead forms, and we do not collect your details.

Who runs the site

FitCalcs is operated by Best Business Loans Ltd, registered at Companies House under number 16833937 and with the Information Commissioner's Office under reference ZC151816. Pages are published under the FitCalcs editorial desk. To contact the editor about any page, email [email protected] with the page URL and your question.