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Health & Fitness Tools

Calories, macros, heart rate and training math. 24 free tools, no sign-up.

Macro Split CalculatorTurn your daily calorie target into protein, carb, and fat grams using a percentage split you choose, all in your browser.Protein Intake CalculatorEstimate grams of protein per day from your body weight and activity goal, worked out instantly in your browser.Calorie Deficit CalculatorEnter maintenance calories and a target loss rate to see your daily deficit and adjusted intake, computed in your browser.Max Heart Rate CalculatorEstimate your maximum heart rate from age using two proven formulas, side by side, all in your browser.Target Heart Rate Zone CalculatorGet Karvonen training zones from your age and resting heart rate, calculated instantly in your browser.Waist to Hip Ratio CalculatorDivide waist by hip measurement and see the WHO health category by sex, computed instantly in your browser.Waist to Height Ratio CalculatorDivide waist by height and see the healthy range guideline, worked out instantly in your browser.Lean Body Mass CalculatorEstimate lean mass and fat mass from weight and body fat, or the Boer formula, all in your browser.Ponderal Index CalculatorCompute the corpulence index using weight divided by height cubed, worked out instantly in your browser.Body Surface Area CalculatorEstimate BSA in square metres using the Mosteller and Du Bois formulas, side by side, in your browser.Running Pace to Speed ConverterTurn minutes per kilometre or mile into km/h and mph, and back again, instantly in your browser.Race Finish Time PredictorEstimate your finish time at a new distance from a recent race using the Riegel formula, computed in your browser.One Rep Max Multi Formula CalculatorEstimate your 1RM from weight and reps using Epley, Brzycki, Lombardi, and Lander in your browser.Steps to Distance CalculatorConvert your step count into kilometres and miles using your height or a custom stride, in your browser.Blood Alcohol Content CalculatorApproximate BAC from drinks, weight, sex, and time using the Widmark formula, all in your browser.VO2 Max EstimatorApproximate your aerobic fitness from a one mile walk test or resting heart rate, calculated in your browser.Smoking Cost CalculatorSee how much cigarettes cost you per week, month, year, and decade based on packs and price, in your browser.Sleep Debt CalculatorCompare your recent sleep against a nightly goal to see your accumulated sleep debt for the week, in your browser.Ovulation Window CalculatorEstimate your fertile window and likely ovulation day from your last period and cycle length, in your browser.Calories to Kilojoules ConverterSwitch between food calories and kilojoules instantly, both directions, all in your browser.Pregnancy Week CalculatorFind your current gestational week, trimester, and days remaining from your last period, in your browser.BMI Prime CalculatorSee your BMI as a ratio to the upper healthy limit of 25, with category, computed instantly in your browser.Reps Per Minute Pace CalculatorTurn a total rep goal and time limit into a pace, sets, and rest plan for pushups or any exercise, in your browser.Daily Water Intake in Ounces CalculatorEstimate daily fluid needs from body weight and activity, shown in ounces, cups, and litres, in your browser.

Free health and fitness tools: TDEE, macros, heart rate zones, one rep max, running pace, body fat, ideal weight and water intake calculators. Informational, private, client-side. All 24 tools are free, run entirely in your browser, and need no sign-up.

Frequently asked questions

Are these health & fitness tools free?

Yes. Every health & fitness tool on yourhack.ai is completely free, with no sign-up and no usage limits.

Do these health & fitness tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop. There is nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

How many health & fitness tools are there?

There are currently 24 free health & fitness tools here, and we add more regularly.

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