No signup, no email wall. Each one explains what it’s doing and where the estimate stops being reliable — because a number without that context is how people end up chasing the wrong target for a month.
Calories burned above resting, plus glycogen used. Most calculators report gross expenditure, which double-counts the metabolism your daily target already assumes — this one doesn’t. Runs the same model Chiron uses to log a real session.
Open calculator →What you burn in a day, all in, via Mifflin-St Jeor — plus what to actually do with the number once the first two weeks disagree with it.
Open calculator →Your daily range by goal and training load. Note the fat-loss range is higher than maintenance, which catches most people out.
Open calculator →The intake and timeline for a target weight — and a warning when the pace you picked is one that tends to cost muscle rather than fat.
Open calculator →Chiron vs MyFitnessPal — an honest comparison, including where MyFitnessPal is genuinely the better choice.
Tracking calories in WhatsApp — how logging works when there’s no app to open and no form to fill in.
Because the calculation was never the hard part. Any of these takes thirty seconds and you’ll have the number. The hard part is six weeks later — knowing whether the estimate was right for you, whether the trend is real or noise, and what to change when it isn’t working.
That needs your meals, your training and your weight in one place, watched over time by something that reasons across all three. That’s the product. These are just the maths.
Chiron holds the whole picture together and tells you what to do about it — in the WhatsApp thread you already have open.
Message Chiron on WhatsApp7-day free trial. No credit card required.
Chiron is a wellness coach, not a medical provider. These calculators use population-level formulas and give you an estimate, not a diagnosis or a prescription. Talk to a doctor before making significant changes if you have a medical condition, are pregnant, or are managing an eating disorder.