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🏗️ Engineering & constructionFree
Vinyl siding calculator
Four ranch walls of 40 and 30 ft at 8 ft high, minus 45 sq ft of openings and plus 10% waste, need 12 squares or 119 panels of 12.5 by 0.8 ft.
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🏗️ Engineering & constructionFree
Welding electrode calculator
A 3000 mm run of 6 mm fillet in E7018 deposits 0.4239 kg of weld metal, so you buy 0.7065 kg of rod: 23 sticks of 3.2 by 350 mm.
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🏗️ Engineering & constructionFree
Wood beam span calculator
A Douglas Fir-Larch No.2 two-by-ten at 16 inches on center under 40 psf spans a little over 16 feet, limited by deflection.
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❤️ Health & fitnessFree
Anaerobic threshold calculator
At 30 years old with a resting heart rate of 60, your estimated anaerobic threshold is 170.5 beats per minute: 85% of the reserve between rest and an estimated…
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❤️ Health & fitnessFree
Batting average calculator
Three hits in ten at-bats is a .300 batting average, written to three decimals exactly as box scores and leaderboards print it.
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❤️ Health & fitnessFree
Batting strike rate calculator
50 runs off 35 balls is a strike rate of 142.86: runs divided by balls faced, times 100, so a Test grind and a T20 finish can be compared on one scale.
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❤️ Health & fitnessFree
Bike gear calculator
A 50-tooth chainring, a 12-tooth cog and a 0.68 m wheel give a ratio of 4.167 and about 8.9 metres per crank turn, so you can compare gears by distance rather…
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❤️ Health & fitnessFree
Bike pace calculator
40 kilometres in two hours is 20 km/h and 3:00 per kilometre: the two figures cyclists quote, from the distance and time your ride computer already shows.
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❤️ Health & fitnessFree
Bike size calculator
A rider of 175 cm with an 81 cm inseam fits a 54 cm road frame, size M, even though height alone says L: the inseam sets the frame, because standover clearance…
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❤️ Health & fitnessFree
Calories burned by heart rate
A 30-year-old man of 70 kg averaging 140 bpm for 45 minutes burns more than 500 kcal, worked out from his pulse instead of a guessed activity.
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❤️ Health & fitnessFree
Calories burned standing calculator
70 kg standing quietly for 60 minutes burns 91 kcal: body weight times hours times 1.3, the published value for quiet standing, already built in.
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❤️ Health & fitnessFree
Burpee calorie calculator
50 burpees in 5 minutes at 70 kg burn about 49 kcal: your pace of 10 per minute sets the intensity at 8 METs, and the standard oxygen-cost formula does the…
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❤️ Health & fitnessFree
Cycling heart rate zones
With a maximum heart rate of 190, endurance rides sit at 114–133 bpm and threshold efforts at 152–171: five cycling zones from one measured pulse, either your…
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❤️ Health & fitnessFree
Cycling wattage calculator
Holding 30 km/h on a flat road with a 70 kg rider, a 10 kg bike and a CdA of 0.32 takes about 150 watts, most of it against the air.
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❤️ Health & fitnessFree
Cycling training zones
An FTP of 250 watts puts threshold intervals at 225–263 W and neuromuscular sprints from 375 W up: seven Coggan power zones, or five heart-rate zones from your…
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❤️ Health & fitnessFree
Earned run average calculator
Three earned runs in nine innings is a 3.00 ERA, and one in eight is 1.13: earned runs times nine, divided by innings pitched, with 6.1 and 6.2 read as thirds…
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❤️ Health & fitnessFree
Effective field goal % calculator
Ten makes, four of them threes, on twenty attempts is an eFG% of 60 against a raw 50: each made three counts as an extra half make, so shooting nights are…
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❤️ Health & fitnessFree
Elliptical calorie calculator
Thirty minutes on an elliptical at moderate resistance burns 280 kcal for someone weighing 70 kg: your weight and a low, moderate or high resistance band…
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❤️ Health & fitnessFree
Fat-burning zone calculator
At 30 years old with a resting pulse of 60, your fat-burning zone is 125–151 bpm: 50 to 70 percent of heart-rate reserve, a range you can read straight off a…
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❤️ Health & fitnessFree
Fish weight calculator
A 20-inch bass with a 12-inch girth weighs about 2.4 pounds, or 1.09 kg: length times girth squared, divided by the shape constant for that species, the formula…
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❤️ Health & fitnessFree
Arrow FOC calculator
An arrow 30 inches long that balances 18 inches from the nock has a front of center of 10 percent, inside the usual target band: the balance point's lead over…
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❤️ Health & fitnessFree
Basketball game score calculator
24 points, 10 rebounds and 6 assists on 9-of-18 shooting, with 3 turnovers and 2 fouls, is a game score of 22.7: Hollinger's weights credit efficient scoring…
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❤️ Health & fitnessFree
Heart rate calculator
At 30 years old your estimated maximum heart rate is 190 bpm: 220 minus your age in whole years, the Fox rule printed on treadmill stickers and club interval…
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❤️ Health & fitnessFree
Hiking calculator
A 10 km trail with 600 m of climbing takes 3 hours of book time and burns about 1719.9 kcal at 70 kg: Naismith's rule for the clock, and a grade-based effort…
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❤️ Health & fitnessFree
ICC net run rate calculator
Scoring 250 in 50 overs and conceding 200 in 50 gives a net run rate of 1.000: runs per over scored minus runs per over conceded, with overs like 47.3 read as…
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❤️ Health & fitnessFree
Lubricant cost to run
Equipment that uses 0.02 litres an hour for 2000 hours needs 40 litres a year, and the tool multiplies that by your unit price to give the year's lubricant…
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❤️ Health & fitnessFree
Magic mile calculator
A 7:30 Magic Mile predicts about 25:01 for a 5K, 1:57:59 for a half marathon and 4:15:38 for a marathon, using Jeff Galloway's published pace multipliers for…
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❤️ Health & fitnessFree
Tanaka max heart rate
At 40 years old the Tanaka equation puts your maximum heart rate at 180 bpm: 208 minus 0.7 times age, a research-based ceiling that falls more slowly with age…
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❤️ Health & fitnessFree
On-base plus slugging calculator
150 hits, 50 walks and 250 total bases in 500 at-bats put a batter's OPS above eight hundred, the mark of a solid regular: on-base percentage plus slugging, one…
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❤️ Health & fitnessFree
Pool table room size calculator
An 8-foot home table with 58-inch cues needs a room of at least 204 by 160 inches: the playing surface plus two cue lengths on each axis, so a ball frozen on…
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❤️ Health & fitnessFree
Race predictor
A 10 km run in 40 minutes points to about 1:28:15 for a half marathon: this predictor turns one real result into a finish estimate at another distance with…
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❤️ Health & fitnessFree
Save percentage calculator
32 saves on 35 shots is a save percentage of about 91.4: enter the two numbers from the scoresheet and get the share of charged shots the goalie stopped, plus…
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❤️ Health & fitnessFree
Slugging percentage calculator
Two singles, a double and a home run in 10 at-bats make 8 total bases and a slugging percentage of .800: enter the five counts from the scorebook and get the…
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❤️ Health & fitnessFree
Snow shoveling calories burned
Thirty minutes of shoveling moderate snow at 70 kg burns about 220.5 kcal: pick the snow weight, enter your body weight and working minutes, and get an estimate…
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❤️ Health & fitnessFree
Steps to calories calculator
10,000 steps at 70 kg with a 0.76 m stride come to about 382.375 kcal over 7.6 km: the calculator turns your step total into distance, walking time and energy.
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❤️ Health & fitnessFree
Steps to km calculator
10,000 steps are about 8 km at the average adult stride of 0.8 m: enter your step total, add your own stride if you measured it, and get the distance in…
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❤️ Health & fitnessFree
Swimming time calculator
1500 m at 1:30 per 100 m takes 22:30: enter the distance and the pace you can hold, and the calculator multiplies the hundreds by that pace to give your finish…
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❤️ Health & fitnessFree
Training pace calculator
10 km in 50 minutes is a pace of 5:00 per km: enter how far you went and how long the clock ran, and get one minutes-per-kilometre figure to compare sessions.
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❤️ Health & fitnessFree
Triathlon time calculator
Splits of 1500, 120, 4200, 90 and 2700 seconds add up to a 2:23:30 triathlon: the calculator sums all five segments in race order, transitions included, and…
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❤️ Health & fitnessFree
True shooting % calculator
25 points on 18 field-goal attempts and 8 foul-shot attempts is a true shooting percentage of 58.0855: one efficiency rate that counts twos, threes and foul…
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🏠 Home, food & hobbiesFree
Alcohol by volume calculator
An original gravity of 1.050 and a final gravity of 1.010 mean 5.25% alcohol by volume. Enter your two hydrometer readings for beer, cider, mead or wine and you…
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🏠 Home, food & hobbiesFree
Alcohol dilution calculator
To take 500 ml of a 60% spirit down to 40%, add 250 ml of water for 750 ml in total. Enter the volume, the current strength and the target, and the alcohol…
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🏠 Home, food & hobbiesFree
BBQ party calculator
For 12 guests, 8 adults and 4 children, over 4 hours, buy 7.5 pounds of meat, 24 side servings, 16 buns, 80 drinks and 24 pounds of ice.
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🏠 Home, food & hobbiesFree
Brine calculator
2 litres of water at 5% salinity take 100 grams of salt and 50 grams of sugar. Enter the water in litres, millilitres, US gallons or cups and the salinity you…
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🏠 Home, food & hobbiesFree
Cake pans calculator
Baking an 8-inch recipe in a 9-inch round pan of the same depth takes 1.265625 times the batter, just over a quarter more.
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❤️ Health & fitnessFree
VO2 max calculator for runners
A 5 km finished in 25:00 means 200 metres per minute, and Jack Daniels' formula turns that speed and the race length into a VO2 max estimate in millilitres per…
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❤️ Health & fitnessFree
Weight loss calculator
Losing 5 kg in 10 weeks takes a deficit of about 550 kcal a day, or 3850 a week: enter the target and the week count to plan a cut for a camp or a weigh-in.
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❤️ Health & fitnessFree
Windsurfing sail size calculator
A 75 kg intermediate rider in 15 knots with skill factor 1.3 gets a 6.5 m² sail: enter weight, wind and skill, and the weight-over-wind rule gives an area you…
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🏠 Home, food & hobbiesFree
Chocolate serving calculator
Twenty guests at 25 g each need 500 g of chocolate, exactly five 100 g bars. Enter the guest count, the grams per guest and your bar size, and get the total…
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🏠 Home, food & hobbiesFree
Coffee kick calculator
Two cups of coffee at 100 mg each keep a useful kick for about 15 hours with typical metabolism. Enter your cups, the caffeine per cup and your clearance rate…
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🏠 Home, food & hobbiesFree
Coffee ratio calculator
288 ml of kettle water at the default 1:16 ratio calls for 18 g of ground coffee. Enter the water you will pour, keep sixteen to one or set your own ratio, and…
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🏠 Home, food & hobbiesFree
Cups to pounds converter
A cup of all-purpose flour weighs about 0.26 lb, so two cups come to just over half a pound. Choose the ingredient, enter the cups, fractions included, and get…
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🏠 Home, food & hobbiesFree
Donut calorie calculator
Two glazed donuts hold 538 kcal, and at 70 kg that takes about three quarters of an hour of steady jogging to burn.
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🏠 Home, food & hobbiesFree
Egg boiling time calculator
A large egg straight from a 4 °C fridge reaches a creamy 70 °C yolk in just under 6 minutes of rolling boil.
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🏠 Home, food & hobbiesFree
Grams to tsp converter
Ten grams of water make 2 teaspoons, because water weighs 1 g per milliliter and a metric teaspoon holds 5 ml.
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🏠 Home, food & hobbiesFree
Healthy coffee calorie calculator
A latte with 180 ml of whole milk and one teaspoon of sugar comes to 136.2 kcal, and the milk alone brings 115.2 of them.
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🏠 Home, food & hobbiesFree
Ice cream calculator
Eight scoops of vanilla ice cream take 480 ml of cream, 240 ml of milk and 150 g of sugar. Enter how many servings you want, pick vanilla, chocolate or…
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🏠 Home, food & hobbiesFree
Oil to butter converter
100 g of oil becomes 125 g of butter: butter is only about 80% fat, so you need 25% more of it to put the same fat into your batter. Free in your browser.
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Pancake recipe scaler
Turn a batter card for 8 pancakes into one for 12: every line is multiplied by 1.5, so 190 g of flour becomes 285 g and 350 mL of milk becomes 525 mL.
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🏠 Home, food & hobbiesFree
Perfect pizza dough calculator
Plan dough by the pie: two 12-inch Neapolitan pizzas at 62% hydration come to two balls of about two hundred eighty-three grams each, already split into flour…
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2
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One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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