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About HealthToad

HealthToad is a free website of health calculators, trackers and timers. It exists for one practical reason: everyday health questions deserve concrete, checkable answers, and most people should not need an account, an app, or a subscription to get one.

Ask a simple question — how much water do I need, what pace should I run, when should I go to bed to wake up refreshed — and the internet usually answers with either a slogan or a sales pitch. HealthToad answers with arithmetic. You enter a few numbers you already know, the tool applies a standard, published formula, and it shows you both the result and the working behind it. If the answer looks wrong, you can see which input caused it and correct it. That transparency is the whole point: a number you cannot inspect is a number you cannot trust, and health numbers deserve more scrutiny than most.

What the site covers

The site's twenty tools fall into four groups. Hydration & Body Metrics covers daily water intake, body mass index and body fat, calorie deficit and total daily energy expenditure, basal metabolic rate, and reference body weight. Fitness, Movement & Running covers step-to-calorie conversion, running pace, target heart rate zones, walking versus running, and calories burned by everyday activities such as cleaning and gardening. Sleep, Rest & Recovery covers sleep cycles and bedtimes, screen-time eye-strain breaks, box breathing, and a sleep duration and quality log. Nutrition, Diet & Macros covers macro nutrient ratios, caffeine half-life, sugar limits, recipe scaling, fruit and vegetable servings, and a wellness habit streak counter.

Alongside the tools sit sixty guides that explain the ideas behind them: why body mass index misleads muscular people, why a calorie plateau happens, how caffeine's half-life affects sleep, what a vegetable serving actually looks like. The guides are written to be read in a few minutes and used immediately, and each one points to the tool that turns its idea into your own numbers.

Privacy first, by construction

HealthToad is deliberately built without accounts, without uploads and without a database of user data. Every calculation runs in your own browser, on your own device. Nothing you type — no weight, no sleep time, no habit — is sent to a server, because there is no server step in the calculation at all. The only storage the site uses is localStorage in your own browser, for tools that need to remember something between visits, such as a sleep log entry or a habit streak, and for remembering your light-or-dark theme choice. That data stays on your device, belongs to you, and disappears if you clear the site's browser data. You can read the full detail in the Privacy Policy.

The site is free to use, and it is intended as general information, not medical advice. Calculators estimate; they do not diagnose. For anything that affects your health in a serious way, a clinician who knows your history is the right person to ask — see the Disclaimer for the full statement. If you spot an error, have a suggestion, or want a tool that does not exist yet, the Contact page explains how to reach us. HealthToad is maintained as a small, independent project: no investors, no data business, and no reason to make a simple calculator complicated.