PartyCalcs.uk
Flower Arrangement Calculator — Stems & Arrangements
Calculate the number of flower stems and arrangements needed for your event.
Add foliage and leaves to arrangements
How We Calculate This
This calculator estimates flower stem quantities based on the number and size of arrangements you need.
The formula
Total stems = arrangements × stems per arrangement
That total is then split into three types using your chosen ratio (default 40% focal flowers — the main blooms, 30% filler flowers — smaller supporting flowers, and 30% greenery — leaves and foliage). The ratios are balanced to always sum to 100%, so the total stem count stays the same whatever split you pick. If you toggle greenery off, its share is redistributed across the focal and filler flowers, so the arrangement stays just as full rather than ending up short of stems.
Frequently Asked Questions
A small arrangement uses 6-8 stems, medium 10-14, and large 16-20. Mix focal flowers (roses, peonies), filler flowers (gypsophila, wax flower), and greenery (eucalyptus, fern) for a balanced look.
Chrysanthemums, carnations, alstroemeria, and gypsophila are the most affordable flowers in the UK. Buying in-season flowers also saves money. Supermarket bunches can be a budget-friendly option.
Most fresh flowers can be arranged 1-2 days before the event if kept in water in a cool room. Hardy flowers like chrysanthemums last longer. Avoid arranging delicate flowers like sweet peas more than a few hours ahead.
Greenery like eucalyptus, ruscus, or fern adds volume and texture at a lower cost than flowers. It fills gaps and makes arrangements look fuller. About 30% greenery to 70% flowers is a good ratio.
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Last updated: February 2026
All calculations are estimates. Adjust quantities based on your guests and event type.