Create. Calculate. Plan. Make.
The fresh weight of flowers needed for a target weight of dried flowers, from the weight loss the flower type gives.
CalculatorFlower food and water for a set of vases, with the water volume worked out from the vase dimensions.
CalculatorConvert length, area, volume, mass and temperature between metric, imperial and US units, and copy the value into any craft.
WizardFour questions that narrow fifteen crafts down to the two or three that fit your budget, your space and the time you actually have.
WizardTurn the yarn you already own into a shortlist of projects that actually fit it.
WizardA quick way to size up a project cost before you commit to it.
Oct 15, 2026
You bought a strand of beads online, they arrived, and they are nothing like the photo. Too small, too big, or worse, the holes are so tight your wire will not pass through. The listing said "6mm" and...
Oct 14, 2026
Yarn math is the part of blanket making nobody warns you about. Run out at row 180 of 200 and you have a problem: dye lots rarely match perfectly, and a substitute yarn can change how the whole thing...
Oct 12, 2026
You are about to start a project and the pattern says "6 skeins of worsted weight." Or worse, you are designing something yourself and there is no pattern at all. You want to buy once, not make three...
Yes. Every calculator, converter, checklist and guide on this site is free, with no account, no trial and no limit on how many times you run one. Some links to tools and materials earn us a small commission, and there is a disclosure wherever that applies. It never changes a result: the arithmetic is the same whether you buy anything or not.
No, and you do not need to create one to use anything here: every calculator, converter, checklist and guide works without signing in. An account is for the editorial side and for the few features that need to know who you are — saved tools, and comments on a site that has them switched on. Registering gets you those; it is not a gate on the tools, which are open to everyone. Nothing you type into a calculator is stored: the calculation runs in the request and the result lives in the URL, so you can bookmark it or send it to yourself. Page views are counted in aggregate, with no personal data attached.
They are arithmetic on the numbers you enter, so the answer is only ever as good as your measurements. Where a figure is a rule of thumb rather than a measurement — a waste allowance, a coverage estimate, a typical load — the tool says so and shows the range it came from. Measure twice, check the material in front of you, and treat the result as the amount to buy rather than the amount to cut.
Each field shows its unit, and the tools that need one have a selector for inches and feet or centimetres and metres. Pick one system and stay in it for the whole calculation — mixing systems inside a single sum is the most common reason a result looks wrong. Most tools convert internally and report the answer in both, so you can work in whichever one you actually measure in.
Because the thing you are buying is sold in whole units. You cannot buy 3.4 boards, 2.7 sheets of plywood or 4.2 skeins, so the result is rounded up to something you can order. It is rounded after the waste allowance is added, not before, which is the difference between a calculation that looks tidier and one that gets you through the project.
Every calculator shows its working, states what it assumes and says what to check against your own yarn, fabric, lumber or wax. The guides explain the decisions the numbers cannot make for you.