Count Substitute Yarn Skeins With an Honest Buffer — Free
The pattern names metres; the shop sells skeins. Somewhere between those two numbers lives the rounding-up that saves a project — and the zero-surplus trap that wrecks one.
The proof surface
Stitch-count tools adjust gauge from a swatch. This stub converts length instead: pattern requirement plus an explicit buffer, divided by per-skein metres and always rounded up, with surplus metres named per option. It does not assess fibre, gauge or dye lots.
InputOption code | pattern requirement metres | metres per skein; buffer metres added to each requirement before rounding
Rare deviceStitch-count tools adjust gauge from a swatch. This stub converts length instead: pattern requirement plus an explicit buffer, divided by per-skein metres and always rounded up, with surplus metres named per option. It does not assess fibre, gauge or dye lots.
Output artifactTotal skeins to buy with row-by-row context
Cost$0 local calculation · no card, paid key, subscription or signup · proposed filing price is not for sale
Sample, not your facts: Illustrative inputs: Cardigan plan | 940 | 210; Scarf plan | 300 | 120. Buffer metres added to each requirement before rounding = 0. Total skeins to buy: 8 whole skeins. All records are invented.
Before using the yarn-substitution stub
Metres must be comparable: pattern requirements quoted in yards need converting to metres (or the whole run done in yards) before entry, and skein labels sometimes list both — use one unit convention per session. The buffer is your own risk margin added to each requirement before rounding; zero is a legal, explicit choice that means round the bare requirement. Skein metres come from the ball band of the substitute yarn, not an average remembered from another brand. The count assumes you can actually buy whole skeins of the substitute; discontinued or hand-dyed yarns may not exist in the quantity computed. Gauge compatibility, fibre behaviour and colourfastness are entirely outside this arithmetic — the stub counts skeins for a yarn you have already decided is suitable.
Why the flat version breaks
Rounding the metre division down
Four-point-four skeins is five skeins in the shop; the fraction cannot be bought. Any plan that rounds down is borrowing yarn it will never hold, and the shortfall always surfaces mid-project. Round up mechanically and let the surplus figure argue the rest.
Skipping the buffer on 'exact' requirements
Pattern estimates assume a standard tension and no mistakes; your project may match neither. An exact-fit calculation with zero buffer has nothing left for swatching or frogging, which is why the stub marks those rows for review rather than treating them as tidy wins.
Substituting by weight instead of length
A 50 g skein of one yarn is not 50 g of another's metreage; thickness changes the length per gram dramatically. Count from metres on the band, and verify gauge with a swatch in the substitute before committing — the stub deliberately refuses to model anything but length.
How to work the yarn-substitution stub
Fix the requirement in one unit
Take the pattern's stated yarn amount and convert everything to metres if it is given in yards or skeins of the original yarn. If the pattern gives skeins of a named yarn, multiply by that yarn's metreage per skein first. Write the convention down; mixing units mid-plan is the usual source of being one skein short.
Read the substitute's ball band
Use the metres-per-skein figure printed on the substitute yarn itself, for the exact weight and line you are buying. Where a shop lists approximate metreage online, treat the band as the source of truth. Anonymous option codes keep the stub shareable without your shopping list.
Add a buffer before rounding, then round up
Requirement plus buffer, divided by skein metres, rounded up to whole skeins. The buffer is your explicit allowance for swatching, tension differences and unravelling; zero means no allowance at all, which the stub will flag on exact fits. Rounding happens once, at the end — never round the intermediate division.
Interrogate the surplus rows
Each row shows the metres left after whole skeins are counted. Small surplus under a tight buffer is your prompt to add one more skein or accept the risk consciously; generous surplus is future mending yarn. For dye-lot-sensitive projects, buy all counted skeins at once — the stub's count is also your lot list.
What the yarn-substitution stub separates
Question
Before
Inspect this instead
Rounding the metre division down
Four-point-four skeins is five skeins in the shop; the fraction cannot be bought. Any plan that rounds down is borrowing yarn it will never hold, and the shortfall always surfaces mid-project. Round up mechanically and let the surplus figure argue the rest.
Read the substitute's ball band
Skipping the buffer on 'exact' requirements
Pattern estimates assume a standard tension and no mistakes; your project may match neither. An exact-fit calculation with zero buffer has nothing left for swatching or frogging, which is why the stub marks those rows for review rather than treating them as tidy wins.
Add a buffer before rounding, then round up
Substituting by weight instead of length
A 50 g skein of one yarn is not 50 g of another's metreage; thickness changes the length per gram dramatically. Count from metres on the band, and verify gauge with a swatch in the substitute before committing — the stub deliberately refuses to model anything but length.
Interrogate the surplus rows
This yarn-substitution stub replaces a manual count or calculation, not source verification or the responsible person’s review.
Run it on the samples, right here
FIRST-LOAD
HYPOTHESIS / PROTOTYPE — checkout unavailable. Calculation is local. A draft is saved automatically in this browser profile when storage is available; Reset to sample clears it. Optional Pro history stores only five summaries and has its own deletion control. State links encode your inputs and can remain in browser history, clipboard or recipients’ records; share only non-sensitive rows. Optional external AI formatting leaves this device. The required site analytics beacon reports page activity; shared URLs contain encoded inputs. Do not treat an encoded URL as private. The calculator has no input-collection endpoint.
Length arithmetic on reader-supplied metres only, not fibre, gauge or dye-lot advice. Verify the substitute yarn's suitability with a swatch and the pattern's gauge requirements before buying or casting on.
Data note: The yarn-substitution stub processes Option code | pattern requirement metres | metres per skein locally. Starter/sample selection and Run compute in this tab; no input is sent by the calculator. A local draft may be saved; explicit state-link sharing or optional external AI formatting can disclose inputs. Use non-sensitive labels.
Go deeper: the companion app files the same reading as a punched ticket stubs
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the yarn-substitution stub reading, and holds your drafts on this device — one complete free app run; the proposed $4 one-time filing layer is not for sale.
The yarn-substitution stub answer stays complete for free. The proposed $4 one-time filing layer adds row CSV, print and five local reading summaries, not hidden answers. Checkout is unavailable; the article demo remains unlimited.
Length arithmetic on reader-supplied metres only, not fibre, gauge or dye-lot advice. Verify the substitute yarn's suitability with a swatch and the pattern's gauge requirements before buying or casting on.
What this is built on
Method: Requirement plus buffer, divided by skein metres, rounded up to whole skeins. The buffer is your explicit allowance for swatching, tension differences and unravelling; zero means no allowance at all, which the stub will flag on exact fits. Rounding happens once, at the end — never round the intermediate division.
All sample records, dates, quantities and labels are invented. No outside policy, contract, rate, clock offset, measurement or accessibility standard is represented as verified.
Google’s official pricing documentation, fetched 2026-10-01, says AI Studio is free in available regions. Optional formatting may require a Google account; manual local entry requires none. Limits can change and free-tier content may be used to improve products. Do not send private records.
Before: skein counts were guessed from pattern optimism. After: each option shows its rounded-up skeins and the exact surplus metres left over.
Three worked readings, with different inputs
Sample A — typical inputs
Cardigan plan | 940 | 210
Scarf plan | 300 | 120
Setting: Buffer metres added to each requirement before rounding = 0. Expected summary: 8 whole skeins.
The cardigan needs 940 m; at 210 m per skein that is 940 ÷ 210 = 4.476, rounded up to 5 skeins with 5 × 210 − 940 = 110 m to spare. The scarf needs 300 m at 120 m per skein: 2.5 rounds up to 3 skeins with 60 m spare. Total to acquire: 5 + 3 = 8 skeins. The surplus metres stay visible per row because leftovers are a real asset for swatching or repairs.
Sample B — changed plan
Hat plan | 150 | 210
Setting: Buffer metres added to each requirement before rounding = 0. Expected summary: 1 whole skeins.
A 150 m requirement inside a 210 m skein still costs one whole skein: the stub rounds up, never down, and reports 60 m of surplus. There is no fractional purchase in this model, which is exactly why the remainder deserves a named place in the plan instead of disappearing.
Sample C — boundary convention
Exact fit | 420 | 210
Setting: Buffer metres added to each requirement before rounding = 0. Expected summary: 2 whole skeins.
Four hundred twenty metres divides exactly into two 210 m skeins with zero surplus — and the stub flags precisely that, because a zero-surplus plan has no slack for a dropped stitch count, a tension difference or a frogged section. Exact arithmetic fits are the rows to double-check, not celebrate.
Optional AI formatting, never the calculation
Manual entry completes this yarn-substitution stub for free without signup. If available to you, the free AI Studio interface linked in the sources may format fictional or non-sensitive notes; external access may require an account. No API key or AI call is built into this tool. Free-tier content may be used to improve products. Review each cell and transcribe it to the labeled row schema; do not paste the JSON object into the row box.
Format only these fictional or non-sensitive notes for a yarn-substitution stub. Return strict JSON shaped as {"rows": [{"label": "string", "cells": ["string", "string"]}], "setting": "string"}. The columns are Option code | pattern requirement metres | metres per skein; the setting is Buffer metres added to each requirement before rounding. Keep all supplied strings and quantities exactly; do not calculate, infer missing entries, invent dates or add advice. If any required value is missing, return an empty rows array and ask me for it separately. I will verify every cell against my source and manually transcribe rows using vertical bars before running the local calculator.
An AI response is not executed, fetched or trusted as a result. Missing values remain questions; the strict local parser checks the rows you actually enter.