Fairy Light Calculator — Metres of Lights Needed

For a warm, ambient glow, plan for about 100 lights (10 metres) per 3-4 square metres of wall or ceiling space. Curtain lights depend on both width and drop: roughly 5 vertical strands per metre of width, each as long as the drop. So a 3 m wide × 2 m drop curtain needs about 3 × 5 × 2 = 30 metres, not 15.

Yes, LED fairy lights are cooler to touch (safer near fabrics), use less electricity, and last much longer. They are available in warm white, cool white, and multicolour. Warm white gives the most atmospheric feel.

Only use lights rated for outdoor use (look for IP44 or higher rating). Battery-operated lights are safest outdoors where mains power is not available. Solar-powered fairy lights work well for summer evening events.

Use adhesive hooks rated for the weight, or drape them over existing beams and fixtures. For marquees, cable ties work well. Avoid using drawing pins or nails in rented venues — always check the venue rules first.