Hobby calculators
Calculators for garden, pets, crafts, games and sport. Garden: Raised bed soil, Plant spacing, Lawn calculator and Seed starting date. Pets: Aquarium volume calculator, Cat age, Pet food portion and Puppy weight predictor. Crafts: Knitting gauge, Yarn estimator, Cross stitch fabric, Candle wax, Resin mixing and 3D print cost. Games and sport: Chess clock, Scoreboard, Mahjong score calculator, Net run rate calculator and Game DPS calculator.
- Chess clockTwo-player game clock with presets, custom time, Fischer increment or delay, pause and low-time warning.
- ScoreboardBig plus and minus buttons for two to six teams, with a choice of step, saved in your browser.
- Card game score keeperA players-by-rounds score table with totals and a leader, for any card game, saved in your browser.
- Fretboard note finderHighlights a note or scale on a guitar, bass or ukulele neck for common tunings or your own.
- 3D print costFilament and electricity cost of a print, with an allowance for failed prints.
- Aquarium volume calculatorWater volume and weight of a rectangular, cylindrical or bow-front aquarium from its dimensions.
- Camping food calculatorCalories, food weight and water to carry for a trip, from the number of people, days and activity level.
- Candle waxWax weight and fragrance oil for candle containers of a given volume.
- Cat ageCat years to human years using the common 15, 24 and plus-4-per-year chart.
- Companion planting guidePick a plant to see its well-known companions and the neighbours gardeners keep apart from it.
- Cross stitch fabricDesign size and fabric to cut from the stitch count, fabric count and margins.
- Egg incubationExpected hatch date and when to stop turning eggs, by bird species.
- Fish tank stocking calculatorHow many fish a tank can hold by the two classic rules of thumb, with a clear warning about their limits.
- Germination rate calculatorPercentage of seeds that sprout in a test and how many seeds to sow for the plants you need.
- Hiking time calculatorWalking time for a route from its distance and total ascent, using Naismith's rule, plus breaks.
- Knitting gaugeCast-on stitches and rows for a target size from your gauge swatch.
- Lawn calculatorGrass seed, sod and fertilizer needed for a lawn of a given size.
- Needle and hook sizesMillimetres to US and UK needle sizes and US crochet hook letters.
- Pattern scalingCopier percentage and new dimensions to scale a pattern up or down.
- Pet food portionA rough daily calorie need and food amount for a dog or cat. An estimate only.
- Plant spacingNumber of plants for a bed from its size and the row spacing on the seed packet.
- Puppy weight predictorA rough adult weight estimate for a puppy from its weight and age in weeks.
- Rainwater barrel calculatorLitres or gallons collected from a roof for a given rainfall, and the number of barrels needed.
- Raised bed soilSoil volume for one or several beds, with a settling allowance and a bag count.
- Resin mixingResin and hardener amounts for a mold from its size and your mix ratio.
- Seed starting dateIndoor sowing window for common crops, counted back from your last frost date.
- Telescope magnification calculatorMagnification, exit pupil, true field of view and focal ratio for a telescope and eyepiece pair.
- Yarn estimatorGrams, length and balls of yarn for a project, from a weighed swatch.
- Net run rate calculatorCricket NRR from runs and overs, with overs read as balls and all-out innings counted as the full quota.
- Required run rate calculatorRuns per over still needed to chase a cricket target, with the current run rate and the gap between them.
- Grand Prix points calculatorSeason points from race and sprint finishing places, plus a check of the gap to a rival and the points still on offer.
- Rugby points calculatorRugby score from tries, conversions, penalties and drop goals, for union or league, with league-table bonus points.
- Mahjong score calculatorRiichi mahjong hand value from han and fu: base points, limit hands, and who pays what on ron or tsumo.
- Mouse sensitivity converterConvert in-game sensitivity between games and DPI settings, and see how far the mouse travels for a full 360 turn.
- Game DPS calculatorExpected damage per second from hit damage, attack speed, crit chance and multiplier, with total damage and time to kill.
- Word tile scoreScore a word with standard English letter values, letter and word bonus squares, blank tiles and a 50-point bonus.
- XP curve generatorLevel-up XP table for a game from a linear, polynomial or exponential curve, with totals and CSV copy.