Apparel Manufacturing Calculators

Planning bulk apparel shouldn’t depend on guesswork. This page brings three practical calculators used in real production workflows—so you can cost faster, reduce fabric waste, and estimate shipping capacity with more confidence.
Use these tools when sourcing polo shirts, T-shirts, hoodies, shorts, and golf apparel from Ninghow.
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What You Can Calculate Here

Four textile swatches with different GSM weights shown side by side

Fabric Weight Converter

Convert GSM ↔ oz/yd² for faster spec alignment

Designer adjusts drop-shoulder seam on oversized hoodie in factory setting

International Size Converter

Convert sizing across US / EU / UK / Asia to reduce fit confusion

Automated cutting machine slicing cotton-poly blend fabric with pattern markers, factory setting

Fabric Consumption Calculator

Estimate fabric usage per style to improve costing

Packaged sportswear stacked for export, each carton labeled and prepared for global shipment in a compliance-focused warehouse environment.

Container Loading Estimator

Estimate how many cartons fit in a container to plan shipping

Inspector measuring hoodies and pullovers on a factory workstation for QC in bulk

Fabric Weight Converter (GSM ↔ oz/yd²)

Sizing misunderstandings cause the most expensive problems: wrong fit comments, re-sampling, delayed bulk, and higher return risk. This converter helps you compare and translate common international size systems—so your tech pack and size range stay consistent across regions.

Worker inspecting garment quality in factory
Fabric Weight Converter
💡 Formula: 1 oz/yd² ≈ 33.906 g/m².
Enter a value in either field to convert automatically.

Tip from production: When converting, also confirm fabric composition + finish (brushed, peached, mercerized, etc.), because feel and performance can change even at the same weight.

International Size Converter (US / EU / UK / Asia)

Different markets use different units. This converter helps you quickly translate fabric specs between GSM and oz/yd², so your tech pack, supplier quotes, and fabric sourcing notes stay consistent.

Best for:

  • Brands selling in multiple markets (US/EU/UK/Asia)
  • Aligning size labels with your fit spec and grade rules
  • Avoiding miscommunication between buyers, designers, and factories

Production note: Size conversion is a starting point. For bulk orders, always confirm garment measurements (spec chart), fit type (regular/slim/relaxed), and fabric stretch/shrinkage.

Standard Size Conversion

International Manufacturing Standards

🇺🇸 USA --
🇬🇧 UK --
🇪🇺 Europe --
🇦🇺 Australia --
🇯🇵 Japan --
*Data Source: Based on general ISO/ASTM standard conversion tables.
Note: "Vanity Sizing" may vary by specific retail brands. As a manufacturer, we strictly follow these international standards unless specified otherwise in your tech pack.

Fabric Consumption Calculator (Costing & Planning)

Fabric is usually the biggest cost driver. This calculator helps you estimate fabric consumption based on your garment inputs (style type, size range, width, shrinkage allowance, etc.), so you can get closer to a realistic BOM and avoid under-ordering.

What it helps you do:

  • Build a faster costing baseline before sampling
  • Compare patterns/cuts (regular vs slim, long sleeve vs short sleeve)
  • Add a practical allowance for shrinkage and cutting loss

Common use cases:

  • Polo shirts (pique) consumption by size run
  • Hoodies (fleece) with rib cuffs/hem allowances
  • Shorts/pants where pocketing and lining affect total usage
Fabric Consumption Calculator
*Note: Estimates are based on standard fabric width (160-180cm) and include average cutting wastage. Actual yield may vary depending on size breakdown and marker efficiency.

Container Loading Estimator (Cartons → Container Capacity)

Shipping mistakes get expensive. This estimator helps you approximate how many cartons can fit into common container types, giving your team a clearer picture of freight planning.

Useful when you need to:

  • Estimate how many units fit in a 20ft / 40ft / 40HQ shipment
  • Plan carton dimensions early to reduce wasted space
  • Compare shipping options (more cartons vs stronger carton protection)

Reminder: Final loading depends on palletization, carton strength, and weight limits. Use this as a planning tool, then confirm with your forwarder.

Container Loading Estimator

Select your product to see estimated loading quantities.

20' GP Container
--
Pieces (Approx.)
40' GP Container
--
Pieces (Approx.)
40' HQ Container
--
Pieces (Approx.)
*Disclaimer: Estimates based on standard flat-pack carton dimensions. (Ref: 20GP≈28CBM, 40GP≈58CBM, 40HQ≈68CBM). Actual loading quantity may vary depending on packaging method and size ratio.

Why Brands Use Ninghow Tools

These calculators reflect the questions we solve daily as a clothing manufacturer—from fabric specs and consumption to international sizing alignment and shipping planning:
  • Sampling support (fit, fabric matching, trims, label & packaging)
  • QC standards tailored to your market
  • Bulk production scheduling aligned to your launch timeline
  • Shipping planning and carton optimization
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FAQ

What’s the difference between GSM and oz/yd²?
GSM measures grams per square meter, while oz/yd² measures ounces per square yard. They describe fabric weight using different unit systems.
Not fully. Weight matters, but quality also depends on fiber type, yarn count, knitting/weaving structure, finishing, and shrinkage control.
It provides a planning-grade estimate. For final bulk ordering, actual consumption should be confirmed after pattern finalization and sample approval.
Because pallet use, stacking limits, container weight limits, and real loading patterns affect capacity.
Yes. Once you share your tech pack (or a sample), we can validate fabric specs, consumption, packing method, and shipping plan.
It’s a fast reference, but brands vary. For production, the most reliable method is your measurement spec chart and approved sample.
Your target market, fit type, size range, and a spec chart (or competitor sample). We can validate grading and suggest adjustments.
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