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.
Subpanel feeder calculator
A 60 A subpanel 80 ft from the main panel comes out at 4 AWG copper on an 80 A breaker, with voltage drop well inside the 3% target.
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Toilet water usage calculator
Ten flushes a day on a 1.6 GPF toilet use 16 US gallons a day and 5,840 gallons a year, with litres shown alongside.
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Transformer sizing calculator
15,000 W of connected load at 240 V single-phase, with a 0.9 power factor, 0.8 demand and the 1.25 continuous factor, calls for a 25 kVA transformer.
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Water service line calculator
15 GPM over 80 feet of copper, with 60 psi at the street and 20 psi kept at the house, needs a three-quarter-inch service line.
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Calculate tip and split a bill
Settle a shared bill without doing sums at the table: 120 with an 18% tip split between 4 people means a 21.6 tip, a 141.6 total and 35.4 each.
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Child allowance calculator by age
With the common rule of one unit per year of age, a 10-year-old gets 10 a week, which adds up to 520 a year and an average of 43.33 a month.
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Pet life stage calculator
A large dog of 8 is already a senior: large breeds become adults at 1.25 years and seniors at 7. Cats follow one schedule, kittens until 1 and seniors from 11…
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Calculate next pet vaccination due date
A canine DHPP shot given on 2024-02-29 is next due on 2027-02-28: the 36-month interval is added as calendar months, and a missing day falls back to the end of…
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Split a shared expense by unequal shares
Divide one shared expense fairly when people use it differently: 120 split by weights of 1, 2 and 3 comes to 20, 40 and 60, and the amounts always add back to…
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Convert cooking measurements
Move a recipe between cups and grams without guessing: 2 US cups of flour are turned into grams at 0.53 g per millilitre, because a cup of flour does not weigh…
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Bicycle Gear Ratio and Development Calculator
See how far one pedal turn takes you: a 50-tooth chainring with a 25-tooth cog gives a ratio of 2, so a 27.5-inch wheel turns twice per revolution, and the…
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Split carpool commute cost among riders
Divide the cost of a shared ride fairly: a commute total of 72 split among 3 riders comes to 24 each, or enter each rider’s distance so people who get out…
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Gift wrap paper calculator
Know how much paper to cut before you start: a 30 × 20 × 10 cm box has 2200 cm² of surface, and with the 10% overlap you need 2420 cm². Works in five units.
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Build Goal Milestone Progress Chart Data Points
See honest progress toward a goal that did not start at zero: moving from 20 toward 100, a value of 68 is 60% done, the 25% and 50% milestones are reached and…
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Grocery budget per meal calculator with category targets
Turn your grocery money into a target for every meal: a budget of 240 for 20 meals allows 12 per meal, split 30% protein, 30% produce and 40% everything else.
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Habit tracking streak calculator
Count your streak from the days you actually completed a habit: July 20, 21, 23, 24 and 25 give a current streak of 3 and 5 completion days, even with a…
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Estimate monthly appliance energy cost from watts and daily use
See what an appliance costs to run each month: 1,200 watts for 2.5 hours a day uses 3 kWh daily and 90 kWh a month, which comes to 16.2 at a rate of 0.18 per…
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Estimate leftover portions for freezing from recipe yield
Plan the freezer before you fill containers: 2,400 ml of soup in 300 ml servings makes 8 portions, and after 3 served now, 5 can be frozen.
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Moving truck size calculator
Get a sensible starting point before you book: a normally furnished two-bedroom home points to a 20-foot truck with about 1016 cubic feet of space.
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Calculate Party Supplies Quantity Needed
Buy enough without guessing: 40 guests with 1.5 plates, 2 cups and 3 napkins each plus a 10% buffer need 66 plates, 88 cups and 132 napkins, 286 items in all.
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Storage unit size recommendation for boxes and furniture
Twenty standard boxes, one sofa and one dresser need about 30 square feet, so the recommendation is a 5 by 10 foot unit.
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Parse chess time control notation and calculate game duration
A 90+30 game over 40 moves can use up to 220 minutes of clock time: the notation is split into base minutes and increment seconds, and both players' clocks are…
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Knitting gauge adjustment calculator
If the pattern says 100 stitches at 20 per four inches and your swatch gives 22, cast on 110 to keep the same width.
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Calculate name numerology value
Type a name and see its Pythagorean numerology number with the working shown: Ada Lovelace uses 11 letters, adds up to 36 and reduces to 9.
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Calculate your numerology life path number from a birth date
Enter a birth date and get its life path number with the arithmetic laid out: 1988-11-29 adds up to 39, then 12, then 3.
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Oil change due mileage calculator
Add the service interval to the reading at your last oil change and compare it with today: a change at 42,000 miles with a 5,000-mile interval is due at 47,000…
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Decode tire size notation
Understand the code on your tire sidewall: 225/45R17 means a 225 mm section width, a sidewall 45% as tall as that width, radial construction and a 17-inch rim.
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College fund progress percentage calculator
Saving 18,500 toward a 50,000 goal puts the fund at 37% with 31,500 still to go. If you pass the goal, the percentage keeps climbing above 100 so the extra…
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Determine diaper size by weight
A baby weighing 7.5 kg gets size 2, which covers 5.44 to 8.16 kg, and size 3 is listed as also eligible.
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Seeded screen-free activity picker for kids by age
For children aged 6 to 8 and the seed “rainy-saturday”, the picker suggests building a paper bridge indoors, one of 2 matching activities.
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Ten-Pin Bowling Score Calculator by Frame
Enter ten frames of pins and get the official score: the sample game, ending with three strikes in a row, totals 167.
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Seeded Standard Card Deck Shuffle
Seed 42 always gives the same order of all 52 cards, starting with the three of clubs, the nine of clubs and the two of hearts.
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Darts Checkout Calculator
170 left is finished with treble 20, treble 20 and the double bull. Enter any remaining score from 2 to 170 to get a legal checkout in up to three darts, always…
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Parse D&D dice notation
2d6+3 means two six-sided dice plus 3: the total ranges from 5 to 15 and averages 10. Type one dice expression such as d20-1 or 4d8 to see the dice count…
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Elo Rating Update Calculator
A 1400 player who beats a 1600 player with a K-factor of 32 gains about 24 points, and the opponent loses the same amount.
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Poker Hand Ranking Calculator
AS KS QS JS 10S is a royal flush, the top category with a strength of 10. Enter five cards to name the hand, from high card upward, and get the tie-break order…
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Build a round-robin schedule from participant names
Four teams such as Falcons, Owls, Ravens and Hawks get 3 rounds and 6 matches, with everyone meeting everyone exactly once.
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RPG XP to next level calculator
A level-12 character with 875 XP on the linear curve needs 325 more, since that level's threshold is 1200.
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Validate Sudoku Board Legality
Find out whether a 9x9 Sudoku position already breaks the rules before you spend more time on it: each filled digit from 1 to 9 is checked against its row…
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Check Tic-Tac-Toe Winner, Draw, or Game in Progress
Paste a 3x3 board such as X O X / O X - / - O X and learn that X has won on the diagonal from the top-left corner; draws, games still in play and impossible…
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Build a single-elimination bracket with automatic byes
Five teams become an eight-slot bracket with three byes for the top seeds, one opening match and three rounds through the final, and the same list always gives…
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Generate a Word Search Puzzle Grid
Give it ORBIT, MOON and STAR, an 8 by 8 grid and the seed 42, and you get a finished puzzle plus the exact start and direction of every word; the same seed…
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Flower bulb calculator
A 100-square-foot bed planted at 5 bulbs per square foot takes 500 bulbs. Add an overplant percent for edges, damaged bulbs or squirrel losses, and the total is…
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Pond volume calculator
A 12 by 8 ft pond with an average depth of 2.5 ft holds 240 cubic feet, close to eighteen hundred US gallons.
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Fence cost estimator
Enter 20 panels, 21 posts, 21 units of concrete and 1 gate with your supplier's unit prices, and get four line costs plus one fence total you can check by hand.
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Fence gate calculator
Two 4-foot gate openings need 4 gate posts, 4 hinges and 2 latches: each opening gets a hinge post and a latch post, and leaves up to 5 feet wide get 2 hinges.
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Fence panel calculator
A 48-foot straight run with 8-foot panels takes 6 panels and 7 posts, because neighbouring panels share a post.
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Lawn roller fill calculator
An 18-inch drum that is 24 inches wide holds about 100 litres of water when full, roughly 100 kg of ballast.
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Lawn topdressing calculator
Spreading half an inch of sand over 5,000 square feet of lawn takes about 7.72 cubic yards. Enter the lawn area and the layer depth, in inches or millimetres…
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Stepping stone calculator
A 20 ft path with stones 2 ft apart, centre to centre, needs 11 stepping stones over 10 gaps, with one stone at each end.
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Excavation volume calculator
A 1,200 square foot dig at an average depth of 4 feet moves 4,800 cubic feet of soil, also shown in cubic yards for truck quotes and in cubic metres for metric…
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Calculate meal prep containers needed
Three prepared meals a day for 5 days makes 15 meals, and if each one needs 3 separate sections while your boxes have 2, you need 30 containers.
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Square footage calculator
A 12 by 10 ft bedroom is 120 sq ft of floor, and with 10% waste you order 132 sq ft. Square yards appear alongside for carpet quotes, so one measurement serves…
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Tile project cost estimator
20 m² of floor with 10% cutting waste means pricing 22 m² of tile, while the thinset and grout totals you already know are added without extra waste.
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Triangle area calculator
A triangle with a 40 ft base and a 25 ft perpendicular height covers 500 sq ft: half of base times height.
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Conference room capacity calculator by seating layout
A 1,200 sq ft room set up classroom-style seats 60 people at 20 square feet each. Enter the usable floor area and pick theater, classroom, boardroom or banquet…
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Event catering food quantity estimator
A 4-hour buffet for 80 guests calls for 132 pounds of prepared food: 120 pounds for appetite and duration plus a 10% reserve.
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Wedding budget breakdown by category calculator
A 30,000 wedding budget becomes 8,400 for the venue, 7,200 for catering and 3,000 for photography, down to 600 for contingency, and every amount adds back to…
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Laundry Cost per Load Calculator for Water and Electricity
A load that uses 0.3 kWh in the washer, 2.5 kWh in the dryer and 15 gallons of water is priced at the electricity and water rates on your own bills, with…
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Gym membership cost per visit calculator
A monthly fee of 60 spread over 12 visits comes to 5 per workout. Enter what one month cost and how many times you went in that same month, and check whether…
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