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Best Free Health & Fitness Calculators

Dial in training and nutrition with the standard formulas. Estimate calories with TDEE, split your macros, find heart rate zones, calculate a one rep max, plan a running pace, and check body composition metrics. These are informational tools, free and private, with nothing uploaded to a server. All 46 tools below are free, run in your browser, and need 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.Golf Handicap CalculatorEnter your recent score differentials and get your handicap index using the World Handicap System average method.Golf Score Differential CalculatorTurn an adjusted gross score, course rating and slope into a WHS differential in one click.Bowling Score CalculatorEnter your rolls frame by frame and get a running score with correct strike and spare bonuses.Baseball ERA CalculatorEnter earned runs and innings pitched to get a pitcher earned run average using the standard nine inning formula.Batting Average CalculatorDivide hits by at bats to get a three digit average, plus a quick read on where it ranks.Slugging Percentage CalculatorEnter singles, doubles, triples and home runs against at bats to get SLG and total bases.On Base Percentage CalculatorEnter hits, walks, hit by pitch and plate appearances to get on base percentage the correct way.OPS CalculatorAdd on base percentage and slugging percentage to get OPS, the popular all in one offensive rating.NFL Passer Rating CalculatorEnter completions, attempts, yards, touchdowns and interceptions for the official quarterback rating.Fantasy Football Points CalculatorEnter yards, touchdowns and turnovers to score a player in standard, half PPR or full PPR.Basketball Shooting Percentage CalculatorGet field goal, three point, free throw, effective and true shooting percentages from your makes and attempts.Points Per Game CalculatorDivide total points by games played to get a per game scoring average for any sport, plus a season projection.Wilks Score CalculatorEnter bodyweight and total lifted to get a Wilks score that compares strength across weight classes.DOTS Score CalculatorEnter bodyweight and total to get a DOTS coefficient score, the modern replacement for Wilks.Barbell Plate Loading CalculatorEnter a target weight and bar weight to see exactly which plates to load on each side of the bar.Darts Checkout CalculatorEnter your remaining score in 501 and see a valid three dart finish that ends correctly on a double.Cycling Power to Weight CalculatorDivide your FTP by body weight to get watts per kilogram and see your rider category.Swimming Pace CalculatorEnter a swim time and distance to get your pace per 100 meters or 100 yards plus average speed.40 Yard Dash Speed CalculatorConvert a forty time into average miles per hour and kilometers per hour to see your sprint speed.Vertical Jump Power CalculatorEnter jump height and body weight to estimate peak leg power in watts.Marathon Split CalculatorEnter a goal finish time to get even and negative split pacing for every 5K and the half marathon mark.Race Split Time CalculatorEnter a target finish time and race distance to get an even pace and the clock time at every split.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

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

Is my data private?

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

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