Calculadora de Quantidade de Tecido
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
metros = (comprimento × repetições / 100) × (1 + perda%)
About this calculator
The Fabric Quantity Calculator helps sewers, designers, and hobbyists estimate how many meters of fabric are needed to make a garment or other item. It considers the length of each piece (in centimeters), the number of repetitions (how many identical pieces will be cut), and a cutting waste margin, usually between 5% and 15%. The result is given in meters, making material purchasing easier.
The calculation is simple: first, multiply the piece length by the number of repetitions, dividing by 100 to convert centimeters to meters. Then apply the waste factor: for example, if waste is 10%, multiply the previous value by 1.10. This formula accounts for fabric lost during cutting due to adjustments, seam allowances, or imperfect pattern layout.
Use this calculator whenever planning fabric purchase for a project. For instance, when making multiple identical t-shirts or a dress with a pattern that requires alignment, the tool prevents buying too much or too little fabric. It is useful for both small artisans and small workshops, helping control costs and waste.
Important precautions: measure the piece length accurately, including seam allowances. Cutting waste varies depending on fabric width, pattern type, and cutter skill. For fabrics with prints or stripes, waste may be higher. Always round up the result and buy a little extra for unforeseen issues, especially if the fabric may shrink after washing.
Frequently asked questions
How to measure the piece length correctly?
Measure from the highest to the lowest point of the piece, including 1 to 2 cm seam allowances. Use a flexible tape measure on a flat surface.
What waste percentage should I use?
For beginners, use 10% to 15%. Professionals can use 5% to 10%. For fabrics with prints or stripes, increase to 15% to 20% due to pattern matching.
Does the calculator consider fabric width?
No. This calculator assumes the fabric is wide enough for the pattern. If the width is less than needed, you will need more meters. Check fabric width before buying.
Can I use it for items like curtains or cushions?
Yes, the formula works for any fabric item. Just measure the desired length and adjust the waste according to cutting complexity.
What if the fabric shrinks?
Buy 5% to 10% more than calculated. Wash and dry the fabric before cutting to avoid shrinkage after sewing.