Apparel industry calculators

Yarn Count Converter

Convert yarn count between Ne, Nm, Tex and Denier: Ne to denier, tex to Ne and back, with the formulas, a yarn count chart for common cotton counts and a denier chart for filament yarns.

GSM to oz/yd2 Converter

Convert GSM to oz/yd2 and back, with a fabric weight chart from 100 to 600 GSM and 3 to 18 oz, the formula (1 oz/yd2 = 33.906 GSM) and typical weights for T-shirts, fleece and denim.

Knit Fabric Consumption Calculator

Calculate T-shirt and knit top fabric consumption in kg per dozen from body length, sleeve length, chest and GSM. The formula, a worked example and a table of kg per dozen from 140 to 240 GSM.

Woven Fabric Consumption Calculator

Estimate woven fabric requirement per garment in yards from measurements and fabric width.

Fabric Roll Weight Calculator

Weight of a fabric roll from its GSM, width and length.

Knitting Yarn Requirement Calculator

Yarn to issue for a knitting program, from required grey fabric quantity and process loss.

Tubular to Open Width Converter

Convert knit fabric width between tubular (flattened tube) and open (slit) form.

Knit Fabric GSM Calculator

Predict single jersey GSM from courses, wales, stitch length and yarn count before knitting a swatch.

Circular Knitting Production Calculator

Calculate circular knitting machine production in kg per hour, per 8-hour shift and per day from diameter, gauge, feeders, rpm, stitch length, yarn count and efficiency, with the formula shown.

Knitting Machine Needle Count

Number of needles on a circular knitting machine: needles = pi x cylinder diameter (inch) x gauge. A 30 inch, 24 gauge machine has 2,262 needles.

Stitch Length Calculator

Loop length to set on the machine for a target single jersey GSM at known courses, wales and yarn count.

CSP and RKM Yarn Strength Calculator

Calculate CSP (count strength product) from lea strength and count, and RKM from single-end strength and tex. Both formulas, a worked example and why CSP and RKM do not convert exactly.

Yarn Twist (TPI/TPM) Calculator

Convert TPI to TPM (x 39.37) and calculate yarn twist per inch and per metre from the twist multiplier and count, with typical twist multipliers for hosiery and warp yarn.

Yarn Count for Target GSM (Guide)

The typical Ne range merchandisers start from for a target single jersey GSM. Guidance, not a formula.

SMV Calculation: Formula and Calculator

SMV calculation: SMV = observed minutes x rating/100 x (1 + allowance/100). A 40 s cycle at 110% rating and 15% allowance is 0.843 min. Calculator below.

Sewing Line Target Calculator

Daily and hourly line target from manpower, working minutes, SMV and expected efficiency.

Line Efficiency Calculator

Calculate sewing line efficiency from output, SMV, operators and minutes worked. The line efficiency formula, the operator efficiency formula, a worked example and an efficiency table.

Operator Requirement Calculator

Manpower needed to hit a daily target at a given SMV and efficiency.

Machine Requirement Calculator

Machines of one type needed for a target, from that machine type's share of the SMV.

Monthly Line Capacity Calculator

Monthly piece capacity of a line from its daily target and working days.

Takt Time Calculator

The pace one piece must leave the line to meet demand.

Order Lead Time Estimator

Rough calendar lead time for an order from stage durations, with fabric and trims procured in parallel.

AQL Sampling Calculator (ISO 2859-1 / ANSI Z1.4)

Find the AQL sample size and accept/reject numbers for a garment inspection from lot size, inspection level and AQL. Single sampling, normal inspection, with the full Level II table for AQL 1.5, 2.5 and 4.0.

Operator Skills Matrix Template

Enter each operator's efficiency on each operation. See coverage, single points of failure and the cross-training needed to reach your target. Download the template as CSV.

CM Calculator (Cost of Making per Piece)

CM calculation for garments: cost of making per piece and per dozen from SMV, operator hourly cost and line efficiency. The formula, a worked example and a CM table by SMV.

Cost per Minute (SAM) Calculator

Calculate a sewing line's cost per minute (CPM) from daily line cost, operators, working minutes and efficiency. Formula, worked example and how CPM feeds CM costing.

Thread Consumption Calculator

Thread meters per garment from seam lengths by stitch class, with wastage and cones per 1000 pieces.

FOB Cost Build-up Calculator

FOB per piece from material and making costs plus commercial percentage and profit.

Per Dozen / Per Piece Price Converter

Convert prices between per-piece and per-dozen quoting conventions.

Liquor Ratio Calculator

Bath water volume for a dye lot from fabric weight and machine liquor ratio.

Recipe % (o.w.f.) to Grams Calculator

Chemical quantity to weigh from a recipe percentage on weight of fabric.

Dye Quantity per Lot Calculator

Enter the lot fabric weight in kg and the shade depth in % on weight of fabric; get the dyestuff in kg and grams for the lot. Formula and worked example included.

Salt and Soda Dosing Calculator

Total salt and soda ash for a bath from g/L dosing and the bath volume implied by the liquor ratio.

Batch Chemical Cost Calculator

Chemical cost of a dye batch and its cost per kg of fabric, from quantities and rates.

Carton CBM Calculator

Cubic meters of one carton and a whole shipment from carton dimensions.

Container Utilization Calculator

Cartons that fit a container from carton dimensions, container type and a stacking utilization factor.

Carton Weight Calculator

Net and gross carton weight from pieces, piece weight and carton tare.

Pieces per Container Calculator

Total pieces a container carries, from carton dimensions, packing quantity and container type.