Health & sport tools.

Work out your body mass index in metric or US units, with the WHO category, a healthy weight range for your height, and the Asian action points.

Calculate waist divided by height, the NICE category and the waist measurement at a ratio of 0.5.

Calculate CDC BMI-for-age percentile, weight category and percentage of the 95th percentile for ages 2–19.

Body fat percentage from tape measurements with the US Navy method.

Estimate your daily calorie needs from age, sex, height, weight, and activity with the Mifflin-St Jeor equation, with targets to lose, keep, or gain weight.

Compare resting calorie estimates from Mifflin-St Jeor, revised Harris-Benedict and, with body fat, Katch-McArdle.

See estimated maintenance calories at every activity level, with a choice of resting-energy formula.

Estimate an intake for a weekly loss goal and see an illustrative timeline with calorie-floor warnings.

Compare Boer, James and Hume lean-mass estimates, or calculate fat-free mass from body-fat percentage.

Convert a step count to miles and kilometres using height or a measured step length.

Estimate gross and active walking calories from steps, step length, weight and walking pace.

Estimate adult daily calories and protein, carbohydrate and fat in grams per day and per meal, using the existing calorie calculator equation.

When to go to bed or wake up, in whole 90-minute sleep cycles.

Log each glass against a daily goal in ml or fl oz, see the last seven days, and get a reminder to drink during the hours you choose.

Compare EFSA and US daily total water estimates, the drinks share, cups and a simple drinking schedule.

Get a reminder every 20 minutes to look at something 20 feet away for 20 seconds, with a countdown for the break and a count of today's breaks.

Ideal body weight for your height by the Devine, Robinson, Miller, and Hamwi formulas, with the healthy BMI range.

Your waist-to-hip ratio, waist size, and waist-to-height ratio against the WHO and common health cut-offs.

How much protein to eat a day and per meal for your weight and goal, from the RDA to muscle building.

How much caffeine is still in your body at bedtime, from what you drank and when, with the daily limit.

Plan medicine times for the day, print a tick chart for a week or a month, and get browser reminders while the page is open.

Estimate calories burned in 55 activities from walking and running to swimming and housework, using MET values.

Five training zones from your maximum heart rate, or with the Karvonen method from your resting heart rate too.

Estimate your one-rep max with seven formulas, with training loads by percentage, in kg or lb.

Plates to load on each side for a target weight, in kg or lb, with a picture and your own plate set.

Predict 5K to marathon times from one race with Riegel's formula.

Estimate VO2max from the distance you run in 12 minutes, with Cooper's rating for your age and sex.

Swim pace per 100 m and per 100 yd, lengths of the pool, and critical swim speed from two time trials.

Your cycling power to weight ratio in W/kg, with the FTP class from Allen and Coggan and the watts for each class.

Gear ratios, gear inches, metres per crank turn, and speed at your cadence for every chainring and cog.

Work out your road and mountain bike frame size and saddle height from your inseam.

Find the front and rear tyre pressure for your weight and tyre width, from Frank Berto's 15% tyre drop measurements.

Find the right ski and pole length for your height and level, for downhill, classic, and skate skiing.

Make a body-dimension label from chest or bust, waist, hip and height, with EN letter ranges and separate international size conventions.

Read Chinese height/girth labels from body measurements, with adult body-type bands and listed children's sizes.

Compare the EN 13402 example height size with the Chinese GB/T 1335.3 height designation.

Estimate a starting bra size from underbust and bust in EU, UK, US, FR/BE, AU/NZ and JP systems, with the cup sequences explained.

Estimate shoe sizes from foot length, or convert a size back to length, with separate adult and children's scales.

Convert ring circumference, diameter, ISO, US and UK sizes, and print a millimetre paper strip.

Convert head circumference into approximate US fitted, UK and European centimetre hat sizes.

Compare hand circumference and length with sizes 6–11 from a published EN ISO 21420 standards summary.

Plan kilometre, mile and 5 km marathon splits with even pacing or a negative split, and print a wrist pace band.

Estimate VO2 max from a Cooper run, Rockport walk or resting and maximal heart rates.

Calculate seven cycling power zones from FTP, with W/kg and optional cycling threshold heart-rate zones.

Find cycling speed from one gear and cadence, or the cadence needed for a target speed.

Calculate 18-hole score differentials, a basic Handicap Index and course handicap using the World Handicap System formulas.

Estimate a due date from the last period, conception, or an IVF transfer, with weeks pregnant, trimester, and the milestone dates ahead.

Estimate an ovulation or conception date and the fertile intercourse window from a due date or last period.

Estimate your fertile window and ovulation day for the next six cycles from your last period and cycle length, for trying to conceive.

Estimate your next six period dates, view a month calendar and export the predicted bleeding dates.

Single or double elimination brackets with seeding, byes, click-through results, printing, and full screen.

Round robin schedules, once or home and away, with scores and a league table.

A big scoreboard for 2 to 6 teams with colours, undo, keyboard control, and full screen that keeps the screen awake.

A two-player chess clock with blitz to classical presets, Fischer increment, and Bronstein or simple delay.

Score a bowling game frame by frame, with strikes, spares, and the tenth frame.

Your expected score and new Elo rating after a win, draw, or loss, with the K-factor FIDE uses.

Your chance of at least one hit in a number of pulls, the pulls needed for 50%, 90%, and 99%, and the effect of a hard pity.

Convert Minecraft Overworld coordinates to the Nether and back, to link portals and travel faster.

Put your team on a football pitch or basketball court in a formation, drag players into place, and save the picture.

Plan circles and ellipses in blocks for Minecraft and other block games, with block counts for every row.

Keep score for up to four golfers over 9 or 18 holes, with out, in, totals, handicap strokes, and Stableford points.

Work out fifth-edition role-playing ability scores by point buy, standard array, or rolling 4d6 drop lowest, with modifiers.

Guess the flags of the world's countries, by choosing or typing, for the whole world or one continent.

Build a winning riichi hand and see its best scoring arrangement, yaku, fu and payments.

Calculate Texas Hold’em win, tie and equity percentages for two to nine players, with known or random hands.

Compute a basic-strategy chart from expected values for your rules and practise choosing actions.

Arrange chess pieces, validate and copy FEN, step through a PGN main line, and export a PNG or SVG diagram.

Draw a picture or threshold an image into a 5×5 to 30×30 nonogram, check uniqueness, play it and print the puzzle with its solution.

Solve a 12–300 piece jigsaw from your photo or a colourful pattern, with tabs, snapping, groups and saved progress.

Score 301, 501 and Cricket for one to eight players, with double-in, double-out, busts, undo and checkout suggestions.

Clear a minefield with safe first clicks, flags and chording. Play beginner, intermediate, expert or a custom board.

Slide and merge equal tiles on a 4 × 4 or 5 × 5 board, with swipe controls and one-move undo.

Play Klondike solitaire with draw 1 or draw 3, card dragging, click-to-move, foundation moves and undo.

Play noughts and crosses against a friend, a random computer or an unbeatable hard opponent.

Match pairs of emoji, numbers or your own local images on three board sizes, alone or with two players.

Guess common English words by category, add a word list in any script, or hide a secret word for a second player.

Guide a growing snake across a grid with five speed levels and a choice of solid or wrapping walls.

Watch four labelled colour pads and repeat the growing sequence, with optional tones and strict mode.

English draughts with compulsory captures, multiple jumps and kings, against a friend or the computer.

Drop discs into a seven-column grid and make a line of four against a friend or the computer.

Place discs, flip trapped rows and use legal-move hints on an eight-by-eight board.

Draw edges, claim completed boxes and keep the extra turn, with boards from 3 × 3 to 8 × 8.

Solve a 3 × 3, 4 × 4 or 5 × 5 sliding puzzle with move counts, a timer and optional image tiles.

Build eight same-suit king-to-ace runs with one, two or four suits, stock deals and undo.

Play classic numbered deals with four free cells, legal supermoves, safe foundation moves and undo.

Match free tiles on the 144-tile turtle or two smaller layouts, with hints and solvable shuffles.

Place a five-ship fleet and hunt the computer on two 10 × 10 grids, with drag or random placement.

Follow a gentle breathing pattern with a square or circle, timed phases and optional soft cues.