Free calculators in the health space are everywhere, but most are plastered with ads, require an email signup, or use simplified formulas that produce numbers too rough to act on. These five are worth keeping around.
Macro & Calorie Calculator — EvvyTools
Calculates your daily calorie target and breaks it into protein, carbohydrate, and fat macros based on your weight, height, age, sex, and activity level. The macro split adjusts based on your goal — fat loss, maintenance, or muscle gain. Genuinely useful for anyone trying to eat with more intention without downloading an app. https://evvytools.com/tools/health-fitness/macro-calculator/
TDEE Calculator — EvvyTools
TDEE (Total Daily Energy Expenditure) is your maintenance number — what you burn in a day doing what you already do. Most people have no idea what theirs is, which makes it hard to know whether a diet is creating a deficit or just feels like one. The TDEE Calculator at EvvyTools runs the Mifflin-St Jeor formula and applies an accurate activity multiplier. Start here before adjusting anything about your diet.
Cronometer
A food tracking app (free tier available) that stands out for its micronutrient data. If you want to know whether you're actually getting enough magnesium or B12, Cronometer goes deeper than most. Good for a short-term audit rather than permanent tracking. No direct link needed — search it.
Body Fat Calculator — EvvyTools
Uses measurement-based methods (Navy method or BMI-based) to estimate your body fat percentage without calipers or a DEXA scan. Not perfectly precise, but useful as a rough marker to track over time. The Body Fat Calculator takes about 60 seconds.
MacroFactor (free trial)
A paid app ($10/month after trial) that dynamically adjusts your calorie targets based on real weight trend data. Worth mentioning because the free trial is generous and the algorithm is legitimately good — better than static calculators for anyone who's been tracking for a while and hit a plateau.
Free tools won't replace working with a registered dietitian if you have complex health goals, but for a quick calibration or sanity check, these cover most of what you need. The EvvyTools ones above are all browser-based — no login, no install.
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