Warp and Weft Calculator

Advanced Fabric Planning Form

Finished Width

cm

Finished Length

m

Width Shrinkage

%

Length Shrinkage

%

Ends Per Inch

Picks Per Inch

Extra Selvedge Ends

Warp Crimp / Take-up

%

Weft Crimp

%

Loom Waste / Header

m

Warp Waste

%

Weft Waste

%

Warp Yarn Count

Warp Yarn Unit

Weft Yarn Count

Weft Yarn Unit

Yarn Price Per Kg

Example Data Table

Fabric Type	Width	Length	EPI	PPI	Warp Count	Weft Count	Expected Use
Plain cotton	150 cm	10 m	60	52	20 tex	18 tex	Shirting trial
Light canvas	140 cm	25 m	44	38	32 tex	36 tex	Bag fabric
Fine lawn	115 cm	50 m	88	76	12 tex	12 tex	Garment fabric

Formula Used

Loom width: Finished width ÷ (1 − width shrinkage ÷ 100)

Loom length: Finished length ÷ (1 − length shrinkage ÷ 100)

Total warp ends: (Loom width in inches × EPI) + selvedge ends

Warp length per end: (Loom length × (1 + warp crimp ÷ 100)) + loom waste

Total warp length: Warp ends × warp length per end × (1 + warp waste ÷ 100)

Total weft picks: Loom length in inches × PPI

Total weft length: Picks × width per pick × (1 + weft waste ÷ 100)

Yarn weight: Total yarn meters × tex ÷ 1,000,000

Estimated GSM: Total yarn weight in grams ÷ finished fabric area in square meters

Cover values are planning estimates. Real cover depends on yarn hairiness, weave structure, finishing, moisture, and loom conditions.

How to Use This Calculator

Enter the required finished fabric width and length.
Add expected shrinkage from washing, finishing, or relaxation.
Enter ends per inch and picks per inch from your fabric plan.
Add crimp, loom waste, selvedge ends, and extra waste percentages.
Select yarn count units for warp and weft yarns.
Add yarn price per kilogram if cost planning is needed.
Press the calculate button to view results above the form.
Download CSV or PDF files for records, quotations, or production sharing.

Warp and Weft Planning Guide

A warp and weft plan turns a weaving idea into usable numbers. It helps you decide yarn length, yarn weight, waste, and rough cost before cutting cones or winding beams. The warp runs lengthwise. The weft runs across the fabric. Both systems change during weaving because yarn bends, interlaces, shrinks, and needs loom allowance.

Why Warp Planning Matters

Warp planning protects the project from shortages. Each warp end needs more length than the finished fabric length. It must include take up, shrinkage, samples, knots, and loom waste. A dense fabric with high ends per inch uses more yarn. Wider cloth also increases the end count. Selvedge ends add strength at both edges. This calculator combines these values so the beam estimate is easier to review.

Why Weft Planning Matters

Weft usage depends on fabric length, picks per inch, loom width, crimp, and waste. Every pick crosses the cloth width. More picks make a tighter fabric and raise yarn demand. Weft crimp increases the real path length because the yarn bends around warp threads. A small percentage change can matter on long runs. The tool also converts yarn count into weight, so purchasing becomes clearer.

Using Counts, Cover, And Cost

Different mills use different yarn count systems. Tex, denier, Nm, and cotton count describe yarn size in different ways. The calculator converts them into tex for weight estimates. It also gives an approximate cover reading. Cover helps judge whether fabric may feel open, balanced, or dense. It is not a lab result. It is a planning guide. Final fabric still needs sampling, finishing tests, and real loom data.

Better Production Decisions

Good estimates reduce downtime and surprise purchases. They also support quoting, stock planning, and small batch trials. Enter realistic shrinkage and waste values. Use past production records when possible. Compare the example table with your own settings. Then export the results for sharing with buyers, weavers, or store teams. A clear worksheet makes fabric planning faster, safer, and easier to repeat. Keep one record for every fabric style. Update it after washing, pressing, and inspection. These notes improve future estimates and help teams spot recurring material losses much earlier too.

FAQs

What is warp in woven fabric?

Warp is the lengthwise yarn system in woven fabric. It is usually placed on the loom beam before weaving. Warp yarns must handle tension, take-up, loom waste, and shrinkage.

What is weft in woven fabric?

Weft is the crosswise yarn system. It passes over and under warp yarns to form cloth. Weft usage depends on fabric width, picks per inch, crimp, and waste.

Why do I need shrinkage values?

Shrinkage changes the required loom dimensions. A finished fabric width or length is often smaller than the woven size. Adding shrinkage gives a safer production estimate.

What does EPI mean?

EPI means ends per inch. It shows how many warp yarns sit in one inch of fabric width. Higher EPI usually means more warp yarn is needed.

What does PPI mean?

PPI means picks per inch. It shows how many weft insertions are placed in one inch of fabric length. Higher PPI increases total weft consumption.

Is the cover percentage exact?

No. It is an approximate planning value. Actual cover depends on weave type, yarn shape, finishing, tension, moisture, and fabric relaxation after weaving.

Can I use different yarn count units?

Yes. The calculator accepts tex, denier, Nm, and Ne cotton count. It converts them to tex for yarn weight and cost calculations.

Should I still make a sample?

Yes. This calculator supports planning, but sampling is still important. A sample confirms shrinkage, hand feel, density, GSM, cover, and real loom behavior.