How much bunting do I need for a room?

Measure the walls you want to decorate in metres. For straight runs, add 10% extra for tying and overlap. For draped or swag-style bunting, you need roughly 40% more than the wall length to allow for the curves.

How long is a standard bunting string?

Most UK bunting is sold in lengths of 3m, 5m, or 10m. Fabric bunting tends to come in longer lengths. Check the listing carefully as some cheaper options are shorter than expected.

Can I make my own bunting?

Absolutely. For DIY bunting, each flag triangle typically uses a 20cm x 20cm piece of fabric. Allow 15-20cm between flags. A 3m string will fit about 10-12 flags.

How do I hang bunting outdoors?

Use cable ties, garden twine, or adhesive hooks. For outdoor events, secure bunting firmly as wind can pull it down. Nylon or plastic bunting withstands weather better than paper or fabric.

PartyCalcs

Bunting Calculator — Metres of Bunting Needed

Work out how many metres of bunting to buy for your party venue or outdoor space.

Wall / Run Length

Number of Walls / Runs

Hanging Style

Price per Metre (optional)

Include 10% extra

Extra for tying, overlap, and wastage

How We Calculate This

This calculator estimates bunting length based on your wall measurements and hanging style.

The formula

Total bunting = wall length x number of walls x style multiplier + extra

Straight runs need 10% extra for tying and overlap. Draped style requires 40% more for the swag curves. Criss-cross overhead needs double the straight distance. An optional 10% extra is added for wastage and trimming.

Frequently Asked Questions

Related Calculators

Balloon Calculator

Calculate how many balloons you need for your party venue, including latex, foil and helium options for any celebration. Free online calculator.

Streamer Calculator

Estimate how many rolls of streamers and crepe paper you need to decorate your party venue or celebration space. Free online calculator.

Table Decoration Calculator

Plan centrepieces, runners and table decorations for each table at your party or event. Get quantities right first time. Free calculator.

Confetti Calculator

Calculate how much confetti you need for your celebration, wedding send-off or party table scatter based on guest numbers. Free calculator.

Banner Calculator

Work out the right banner sizes and quantities to decorate your party venue, including happy birthday and custom message banners. Free calculator.

Last updated: February 2026

All calculations are estimates. Adjust quantities based on your guests and event type.