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❤️ Health & fitnessFree
Fat-free mass index calculator
Scores your lean mass against your stature: at 80 kg, 1.8 m and 15% body fat, 68 kg of lean mass is divided by height squared to give FFMI in kg/m².
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Daily fiber intake calculator
Turns your daily calories into a fiber target: a 35-year-old woman eating 2000 kcal gets 28 g a day, shown beside the 25 g Adequate Intake for her age and sex.
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Mean arterial pressure calculator
A reading of 120/80 mmHg gives a mean arterial pressure of about 93.3 and a pulse pressure of 40. Enter your systolic and diastolic numbers to get the average…
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Pack years calculator
Smoking 20 cigarettes a day for 10 years adds up to 10 pack-years. Enter the average number smoked per day and how long that lasted to get the exposure figure…
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Pregnancy weight gain calculator
With a pre-pregnancy BMI of 22, the recommended gain by week 20 is 4.5 to 6 kg, on the way to 11.5 to 16 kg at term.
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Daily protein intake calculator
At 70 kg and 1.6 g of protein per kilo, your daily total is 112 g. You choose the multiplier from your coach, sport guidelines or clinician, and the calculator…
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Riegel race time predictor
A 10K run in 40:00 predicts 1:28:15 for a half marathon with Riegel's formula and its classic 1.06 exponent.
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Running calorie calculator
Running 10 km at 70 kg on flat ground burns about 700 kcal net, roughly 1 kcal per kilo per kilometre.
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Running pace calculator
Run 10 km in one hour and your pace is 6:00 per kilometre, or 9:39 per mile, at an average of 10 km/h.
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Steps to distance calculator
Multiply your steps by your step length to get the distance walked: 10000 steps at 0.75 m is 7500 m, or 7.5 km.
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Swimming pace calculator
Enter a distance and finish time to get your pace per 100 m and per 100 yards: 1500 m in 20 minutes is 1:20 per 100 m, about 1:13 per 100 yd, plus your speed.
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Target heart rate Karvonen calculator
A 30-year-old with a resting pulse of 60 who trains at 70% of reserve should aim for 151 beats per minute.
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VO2 max Cooper test calculator
Covering 2800 metres in the Cooper 12-minute test gives an estimated VO2 max of about fifty-one mL/kg/min.
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Waist-to-height ratio calculator
An 80 cm waist with a height of 170 cm gives a ratio of 0.47, inside the healthy band below 0.5. Enter both measurements in the same unit and see your band at…
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Waist-to-hip ratio calculator
A woman with an 80 cm waist and 100 cm hips has a ratio of 0.8, right where the moderate band starts.
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BPM to milliseconds calculator
At 120 BPM a quarter note lasts 500 ms and a dotted eighth 375 ms: enter your tempo and get every note length and delay time, from whole notes to…
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Cents between frequencies calculator
From 440 Hz to 880 Hz is 1200 cents, exactly one octave with a ratio of 2. Enter any two frequencies to get the signed interval in cents and check a tuning, a…
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Chord note calculator
C major gives C, E and G, labeled P1, M3 and P5. Enter a root and a quality such as maj7, sus4 or m7b5 to see every tone with its interval name and half-step…
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Crop factor calculator
A 50 mm lens on a 1.5 crop body frames like 75 mm on full frame, and its f/1.8 compares as f/2.7 for depth of field.
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Depth of field calculator
A 50 mm lens at f/2.8 focused at 5 m keeps things sharp from just over 4 m to almost 6 m. See near limit, far limit, total zone and hyperfocal distance before…
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Equivalent exposure calculator
Stopping down from f/4 to f/8 at 1/125 and ISO 100 means a shutter of 0.032 s to keep the same light.
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Exposure value calculator
f/2.8 at 1/60 s and ISO 100 is about EV 8.878. Each whole EV step is one stop of light, so two setups can be compared at a glance without juggling three…
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Camera field of view calculator
A 50 mm lens on a 36 by 24 mm full-frame sensor covers just under forty degrees across and nearly forty-seven on the diagonal.
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Golden ratio font size calculator
Start from a 16 px body and every heading grows by the square root of phi, so heading 5 lands exactly on 16 times phi.
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Knitting gauge calculator
At 5.5 stitches and 7.5 rows per inch, a 20 by 24 inch piece needs 110 cast-on stitches and 180 rows.
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Modular type scale generator
From a 16 px base with a 1.25 ratio, five steps give 16, 20, 25, 31.25, 39.0625 and 48.828125. Pick three numbers and get a whole hierarchy of type sizes…
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Musical interval calculator
From C up to G is 7 semitones, a perfect fifth: enter two note names, with or without octave numbers, and get the distance in semitones, the short label and the…
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Note frequency calculator
A4 sounds at 440 Hz and is MIDI note 69: enter a note name and an octave, change the reference A if your ensemble tunes elsewhere, and get the exact frequency…
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NPF rule calculator
At f/2.8 with a 24 mm lens and 5.9 µm pixels, stars on the celestial equator stay sharp for under three seconds: enter aperture, focal length, pixel pitch and…
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Poker outs and odds calculator
With 9 outs and 47 unseen cards, the next card completes a flush draw exactly 9 times in 47: enter your outs and the unseen cards to get the exact chance on the…
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Print size & DPI calculator
A 3000 × 2000 pixel photo at 300 DPI prints 10 inches wide, or 25.4 cm: enter the pixel size and either a DPI or the print size you want, in inches, centimetres…
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Reading time estimator
A 1200-word article read at 200 words per minute takes 6 minutes: enter the word count and a realistic reading speed to get the time in minutes, hours and…
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Epoxy resin mix calculator
A 2:1 epoxy for a 100 ml mold splits into two thirds resin and one third hardener: enter the total amount and the ratio printed on the bottle, by volume or by…
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Musical scale generator
C major comes out as C D E F G A B with the pattern whole, whole, half, whole, whole, whole, half: pick a root such as F sharp or B flat and a scale type to get…
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Music transposition calculator
Move C up 2 semitones and you get D. Type a note or chord such as F#m7 or C/E, choose how many half steps to shift, and get the new chord with its quality and…
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Yarn weight substitution calculator
A pattern needing 1200 yards takes 6 skeins of 220 yards but 7 of 180, because 1200 divided by 180 is six and two thirds.
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Air conditioner BTU calculator
A 250 sq ft room with an 8-foot ceiling, average sun and two people needs about 5000 BTU per hour.
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Concrete block calculator
263 blocks cover a 20 m² wall when each face measures 0.4 by 0.2 m and you allow 5 percent for cuts and breakage.
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Carpet calculator
A 5 by 4 m room with a 4 m roll needs one 5 m strip, or 5.5 linear metres with 10 percent waste, instead of two strips totalling 8 m.
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Concrete column calculator
Four round columns 0.4 m across and 3 m tall take about one and a half cubic metres of concrete: pi times the radius squared times the height, times the number…
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Concrete footing calculator
Four pad footings of 2.4 × 0.6 × 0.3 m hold 1.728 m³ of concrete, 0.432 m³ each: length times width times depth, times the number of identical pads.
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Concrete slab calculator
A 4 × 3 m shed pad, 10 cm thick, needs 1.2 m³ of concrete, exactly 80 bags at the default bag size.
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Crown molding calculator
A 48 ft room with 8 ft sticks and 10% waste needs 7 sticks of crown molding, covering 52.8 ft with 3.2 ft left over.
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Deck board calculator
A 24 m² deck with 0.14 × 3.6 m boards, 5 mm gaps and 10% waste needs 51 boards. Each board is counted with its gap, the waste is added on top, and the result is…
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Fence post calculator
A 100-foot run with posts every 8 feet needs 13 sections, 14 posts and 26 rails at 2 rails per section, because neighbouring sections share a post.
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Lawn fertilizer calculator
A 5,000-square-foot lawn fed 1 pound of nitrogen per 1,000 square feet from a 20% nitrogen bag needs 25 pounds of product.
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Floor tile calculator
A 20 m² room laid with 0.6 m tiles and 10% waste needs 62 tiles, which is 7 boxes of 10. Enter room area, tile size, waste and tiles per box to buy whole boxes…
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Gravel calculator
Covering 50 m² with gravel 0.1 m deep takes 5 m³, which at a bulk density of 1,600 kg/m³ weighs 8,000 kg.
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Heater BTU calculator
A 2,000 cubic foot room with good insulation and a 30 °F temperature rise needs 60,000 BTU per hour.
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Insulation R-value calculator
3.5 inches of fiberglass batt at R-3.14 per inch plus half an inch of gypsum board at R-0.9 add up to a wall of R-11.44.
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Laminate flooring calculator
A 20 m² room with laminate packs that cover 2.2 m² each and the default 10% waste needs 22 m² of planks, so you buy 10 packs.
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Mortar calculator
500 bricks at 0.001 cubic metres of mortar each need 0.5 m³ of mortar, which is 42 whole bags of a typical 0.012 m³ mix.
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Paver calculator
A 20 m² patio laid with 0.6 m square pavers and 10% waste needs 62 pieces. Enter the area, the paver size and your waste allowance, and the count is always…
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Pool chlorine dosage calculator
Raising 10,000 US gallons from 1 to 3 ppm with 10% liquid bleach takes 25.6 fl oz, or 1.668 lb of product.
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Swimming pool volume calculator
A 10 by 5 m rectangular pool with an average depth of 1.5 m holds 75 m³, or 75,000 litres. Choose rectangular, round or oval, enter the sizes and get litres and…
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Roof pitch calculator
Measure 6 of rise over 12 of run and you have a 6/12 pitch, a 50% slope and a rafter multiplier of about 1.118.
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Roofing shingles calculator
A 2,000 sq ft roof plan with a 1.118 pitch factor has 2,236 sq ft of real surface, which means 23 squares and 68 bundles at 33.3 sq ft per bundle.
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Sand calculator
12 m² of patio bedding laid 0.1 m deep is 1.2 m³ of sand, and at 1,600 kg/m³ that weighs 1,920 kg.
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Staircase step calculator
A 2800 mm floor-to-floor rise with a 180 mm target riser becomes 16 equal risers of exactly 175 mm and 15 treads, with tread depth and a total run of 4375 mm…
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Topsoil calculator
1,000 sq ft of lawn topped with 2 inches of soil takes just over 6 cubic yards, or a little under 5 cubic metres.
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