Home, food & hobbies
729 everyday calculators for home, cooking and free time: recipes and servings, tips and shared bills, paint and flooring, pets, games and hobbies. Quick answers to the small questions of daily life, free in your browser.
Organ pipe diameter scale calculator
Enter a speaking length and a halving ratio to get the pipe's internal diameter: with Normalmensur, a pipe one octave above the 155.5 mm 8′ C comes out well…
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PCM Audio Bitrate Calculator
Stereo 24-bit audio at 48000 Hz produces 2.304 Mbps, or 288000 bytes per second, before any compression.
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Polyrhythm Alignment Calculator
Three against four fits on a grid of 12 pulses: one part plays every 4 pulses, the other every 3, and they meet only at the start and end of the cycle.
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Pythagorean tuning interval ratio calculator
Seven pure fifths reduced into one octave give exactly 2187/2048: enter any signed number of 3:2 fifths and get the exact fraction, the decimal ratio, the…
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Tuning error in cents calculator
Playing 442 Hz against a 440 Hz target is just under eight cents sharp: enter the frequency you hear and the one you want, and get the signed error in cents and…
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Chess material balance calculator
When White has 8 pawns and no bishop against Black's 7 pawns and a bishop, the count is 33 to 35: Black is ahead by 2 points.
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D&D Encumbrance Threshold Calculator by Strength
A Strength of 14 means you are encumbered above 70 pounds and heavily encumbered above 140. Enter any score from 1 to 30 and settle carrying questions without…
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D&D initiative modifier calculator
A Dexterity modifier of +3, the Alert feat's +5 and a +1 magic item give an initiative modifier of +9.
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D&D point buy cost calculator
The array 15, 14, 13, 12, 10 and 8 costs 9, 7, 5, 4, 2 and 0, exactly 27 points. Enter your six scores and see at once whether your build fits the campaign…
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D&D spell attack bonus calculator
A proficiency bonus of +3 and a spellcasting modifier of +4 give a spell attack bonus of +7. Enter the two numbers from your sheet and check the total at a…
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D&D XP to Next Level Calculator
A character with 14,500 total XP is level 6 and needs 8,500 more to reach level 7 at 23,000. Check it right after awarding encounter XP, without scanning the…
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d20 success chance vs DC calculator
With a +5 modifier against DC 15 you need a natural 10 or higher: 11 of the 20 faces succeed, a 55 % chance.
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Dice notation min and max calculator
2d6+3 can never land below 5 or above 15, and that gives 11 possible totals. Paste a damage line, an attack roll or a homework expression and see its full…
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Chess performance rating calculator
Scoring 4.5 out of 6, or 75 %, against opponents averaging 1800 is a performance of 2000, a 200-point edge over the field.
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Knitting stitches for width calculator
Count 22 stitches over 4 inches, ask for 18 inches, and you get 99 stitches to cast on. Pick nearest, up or down rounding and see the width that whole count…
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D&D challenge rating to XP calculator
A CR 5 monster is worth 1800 XP on the fifth-edition table. Enter any challenge rating from 0 to 30, including 1/8, 1/4 and 1/2, and get the award without…
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Bingo card combinations calculator
Classic 75-ball bingo with an open center square allows 552,446,474,061,128,648,601,600,000 different cards.
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Go Area Score Calculator
Black with 45 points of territory and 120 stones scores 165, while White's 42 and 116 plus 6.5 komi reach 164.5: Black wins by half a point.
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MTG mana curve calculator
Twelve one-drops, 14 two-drops, 10 three-drops, 6 four-drops and 2 five-drops make 44 cards and 104 total mana value, an average a little below two and a half.
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Scrabble bingo bonus calculator
Seven tiles worth 10, 1, 1, 10, 10, 1 and 1 make a 34-point word, and the bingo bonus lifts it to 84.
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Sudoku Grid Validity Checker
One repeated digit can ruin a Sudoku long before you notice it. Paste the nine rows of your grid, even with only 30 cells filled, and every cell breaking a rule…
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Poker starting hand combinations calculator
Pocket aces come in exactly 6 combinations, a suited hand like AKs in 4 and an offsuit one in 12: type a preflop label or a plain phrase and see the count with…
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Poker Pot Odds Calculator
Facing a bet of 25 into a pot of 100 gives you 4:1 odds, so your hand needs at least 20 % equity to break even: enter the pot and the amount to call to see the…
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Beading Strand Length Calculator
Twenty-four 8 mm beads plus spacers of 2, 2, 3 and 3 mm take up 202 mm of strand, or 20.2 cm. Enter the beads, their size along the hole and each spacer to…
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Crochet Flat Circle Rounds Calculator
Six rounds of single crochet that start with 6 stitches end at 36, adding 6 every round: 6, 12, 18, 24, 30, 36.
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Cross stitch floss estimator
A chart with 2450, 980 and 125 stitches in three colors needs 4 skeins at 1800 stitches per skein with a 12 % allowance.
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Stitch gauge from swatch calculator
Counting 22 stitches and 30 rows over 4 inches gives a gauge of 5.5 stitches and 7.5 rows per inch.
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Quilt Batting Size Calculator for Shrinkage and Trimming
A 60 by 80 inch quilt top with a 4-inch margin per edge and 3 % shrinkage needs batting of 69.8557 by 90.4742 inches.
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Quilt block count calculator
A 60 by 80 quilt with 12-inch blocks takes 30 blocks, 5 across and 6 down, covering 60 by 72 and leaving 8 for borders.
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Bias binding yardage calculator
A 60 by 80 quilt needs 290 of binding, and with 2.25-inch strips a fabric square 25.54408 on each side gives it as one continuous strip.
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Soap making water amount calculator
At 33 % concentration, 142.5 g of lye takes just over twice its weight in water, and that water makes up 67 % of the solution.
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Candle Container Wax Weight Calculator
An 8 US fl oz jar filled to 90 % with soy wax at 0.86 g per ml holds under 8 oz of wax by weight. Enter the volume, its unit and the wax to get the weight in…
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Diamond painting drill count calculator
A 30 × 40 cm canvas with 2.5 mm drills holds 120 columns by 160 rows, or 19200 drills. Enter the painting size in cm, mm or inches, plus colors and a spare…
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Boards for Panel Width Calculator
A 30-inch panel from 5.5-inch boards, losing 0.125 per board at the edges and keeping 0.5 for trimming, takes 6 boards, with 1.75 of extra width to spare.
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Bowling Average Calculator for League Standings and Handicap
1742 pins over 9 games is a precise average of 193.556 but a league average of 193: enter total pinfall and games to see both, the leftover pins and how many…
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Darts 501 score remaining calculator
Score 60 from 501 and 441 is left: enter the score you still need and the points from the visit to get the new total, with a clear signal when the visit busts…
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Golf course handicap calculator
A 12.4 index on tees with slope 130, course rating 72.1 and par 72 gives a course handicap of 14 strokes: enter your index and the scorecard figures to know…
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Golf strokes received per hole calculator by stroke index
A course handicap of 20 over eighteen holes means one stroke on every hole and a second on stroke indexes 1 and 2.
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Bicycle gear ratio calculator
A 50-tooth chainring with an 11-tooth cog turns the rear wheel more than 4 times per crank revolution, while 32 with 36 turns it less than once: enter both…
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Bike speed from gear and cadence calculator
Pedalling at 90 rpm in a 2.5 gear on a wheel with a 2.105 m rolling circumference gives about 28.42 km/h: enter cadence, the gear ratio or tooth counts and the…
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Calories burned from MET calculator
Thirty minutes at MET 8 for a 70 kg person burns about 280 kcal, at a rate of 560 kcal per hour: enter the MET value, your weight and the duration to get the…
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Bouldering grade conversion calculator
V5 converts to 6C and a Font 7A comes back as V6: type a grade from either scale and get its counterpart from the consensus table climbers and guidebooks use…
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Scuba Air Consumption at Depth Calculator
With a SAC of 18 litres a minute at 20 m in salt water, you breathe 54 litres a minute, so 1800 litres of usable gas last about 33.33 minutes: enter SAC, depth…
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Tobler Hiking Speed Calculator for Uphill and Downhill Slopes
On a 10 % uphill grade, Tobler's function predicts about 3.5 km/h. Enter a signed slope, positive for climbing and negative for descending, and get speed in…
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Buy one get one effective price calculator
Seven items on a buy-two-get-one deal: you pay for five, take seven home, and each one effectively costs five-sevenths of its regular price.
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Cash change due calculator
A sale of 13.47 paid with 20.00 leaves 6.53 in change, worked out to the exact hundredth with no rounding surprises.
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Coin jar value calculator
100 pennies, 40 nickels, 50 dimes and 40 quarters add up to 18 dollars and fill five standard bank rolls with nothing left over.
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Coupon savings calculator
A 15% coupon on 79.99 saves 12.00 and leaves 67.99 to pay. Enter the price before the coupon, choose percent off or a fixed amount off, and see the saving and…
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Group dinner cost share calculator
A pizza for two, a steak for one and a salad for three, with 18% tip and 8.5% tax, come to 110.06, and the steak eater pays 59.45 of it.
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Divide money evenly with cents calculator
Split three ways, 10.00 becomes 3.34, 3.33 and 3.33, which add back to exactly 10.00. Enter an amount and the number of people to get cent-exact shares, with…
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Gift card and cash split calculator
A purchase of 86.4 with a gift card holding 50 leaves 36.4 to pay in cash and nothing on the card.
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Itemized bill split calculator
On a 35 food bill with 2.8 tax and a 6.3 tip, Alice, who ordered 20.5 of the food, owes 25.83 and Bob owes 18.27.
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Membership break-even calculator
A 120 membership that cuts each use from 10 to 4 saves 6 per use and pays for itself after 20 uses, when both options cost 200.
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Price ladder tier calculator
Start at 25, add 10% per level and five tiers come out as 25, 27.5, 30.25, 33.28 and 36.6, each step compounding on the one before.
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Shopping budget tracker
With a budget of 100 and milk, bread, eggs and apples totalling 10.53, you have 89.47 left. The balance after every item shows which addition would tip the cart…
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Brick wall calculator
In a 10 m² wall of 215 by 65 mm bricks, 10 mm joints take up 1.7185 m² of the face, and the wall needs 623 bricks with 5 percent waste.
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Ceiling joist count calculator
A 144-inch room framed at 16 inches on center needs 10 ceiling joists, 9 full bays plus the closing joist at the far end.
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Collar tie count calculator
A 40 ft ridge with ties every 4 ft needs 11 collar ties: one at each end of the ridge plus one at every spacing mark in between.
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Concrete bag calculator
2.5 cubic yards plus 10% waste come to 248 bags of 40 lb, 165 bags of 60 lb or 124 bags of 80 lb of premix.
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Concrete pier calculator
Eight piers 12 inches across and 4 ft deep take just under 1 cubic yard of concrete, also shown in cubic feet, cubic metres and litres.
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