Trouser Consumption | Apparel Merchandiser

Choose Calculation Method

Side Seam Calculation

Side Seam Includes Waistband Height “When checking out, exclude waistband height.”

Side Seam Length (cm)

Thigh Measurement (cm)

Waistband Height (cm)

GSM (Grams Per Square Meter)

Wastage Percentage (%)

Inseam Calculation

Inseam Includes Waistband Height “When checking out, exclude waistband height.”

Inseam Length (cm)

Front Rise (cm)

Back Rise (cm)

Thigh Measurement (cm)

Waistband Height (cm)

GSM (Grams Per Square Meter)

Wastage Percentage (%)

Calculation Results

Calculated Length

0.00 cm

Calculated Width

0.00 cm

Fabric Consumption per Dozen

Formula: ((L × W × 4 × GSM × 12) / 10,000,000) + Wastage %

(0.00 × 0.00 × 4 × 0 × 12) / 10,000,000

Base Consumption: 0.0000 kg

Wastage (5%): +0.0000 kg

Total with Wastage: 0.0000 kg/dozen

Complete Formula Guide

1. Side Seam Method

A) Side Seam Including Waistband

Length Formula:

Length = Side Seam + 3 cm (hem) + Waistband Height + 1 cm (sewing)

Width Formula:

Width = Thigh Measurement + 2 cm (sewing allowance)

B) Side Seam Excluding Waistband

Length Formula:

Length = Side Seam + 4 cm + (Waistband Height × 2) + 2 cm

Waistband × 2 because waistband is double folded

Width Formula:

Width = Thigh Measurement + 2 cm (sewing allowance)

2. Inseam Method

A) Rise Includes Waistband Height

Length Formula:

Length = Inseam + 3 cm (hem) + Bigger Rise + Waistband Height + 1 cm (sewing)

Width Formula:

Width = Thigh Measurement + 2 cm (sewing allowance)

B) Rise Excludes Waistband Height

Length Formula:

Length = Inseam + 3 cm + Bigger Rise + 1 cm + (Waistband Height × 2) + 2 cm

Waistband × 2 because waistband is double folded

Width Formula:

Width = Thigh Measurement + 2 cm (sewing allowance)

3. Final Consumption Formula (Per Dozen)

Formula:

Consumption (kg/dozen) = (Length × Width × 4 × GSM × 12) / 10,000,000 + Wastage %

Why multiply by 4?

A trouser has 4 panels: Left Front, Left Back, Right Front, Right Back

Why multiply by 12?

To convert per piece consumption to per dozen

Why divide by 10,000,000?

This is the conversion factor: (100 cm/m × 100 cm/m) × 1000 gm/kg

Learn About Fabric Consumption

What is GSM?

GSM = Grams Per Square Meter

It indicates the weight of fabric per square meter area. GSM is one of the most important factors in fabric consumption calculation.

Higher GSM

Thick, heavy fabric (winter wear, denim)

Lower GSM

Light, thin fabric (summer wear, activewear)

Why Wastage is Necessary

Wastage, or 'consumption loss,' is the extra fabric consumed beyond the net garment size due to unavoidable reasons:

1. Cutting Wastage

Uneven fabric edges (selvedge)
Marker planning inefficiency
Hole defects in fabric roll

2. Packing Wastage

Small fabric pieces reserved for repair
Quality control samples
Cutting samples for wash test

3. Finishing Wastage

Panels shrink during washing or finishing
Stains or defects may appear
Some garments fail final inspection

Pro Tip: In the industry, a standard wastage percentage is typically between 5% to 8%.

Common Measurement Methods

The chosen calculation method depends on the measurement chart provided by the buyer:

Side Seam Method

Measures from waist to hem along the outer side of the pant. Common in European sizing charts.

Inseam Method

Measures from crotch to hem, plus rise measurements. Common in American and Asian sizing charts.

The Magic Formula Secret

If you can correctly calculate Length and Width, then fabric consumption becomes extremely easy.

However, you must practice regularly to calculate perfectly. A small mistake in consumption can change the final price of a garment, making your job difficult.

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Fabric Consumption Formula

Choose Calculation Method

Side Seam Method

Inseam Method

Side Seam Calculation

Inseam Calculation

Calculation Results

Fabric Consumption per Dozen

Complete Formula Guide

1. Side Seam Method

A) Side Seam Including Waistband

B) Side Seam Excluding Waistband

2. Inseam Method

A) Rise Includes Waistband Height

B) Rise Excludes Waistband Height

3. Final Consumption Formula (Per Dozen)

Learn About Fabric Consumption

What is GSM?

Why Wastage is Necessary

1. Cutting Wastage

2. Packing Wastage

3. Finishing Wastage

Common Measurement Methods

Side Seam Method

Inseam Method

The Magic Formula Secret

Pro Tip

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