PartyCalcs.uk
Table Centrepiece Calculator
Calculate centrepiece dimensions and flower stems needed based on table size and style.
Adds 3 accent tea lights around each arrangement (3–5 is the norm). These are extra to any candles already in a candle cluster or lantern — turn off if those are enough.
How We Calculate This
Sizing Formula
Centrepiece diameter (round/square) = Table diameter (or side) × 25%, so it stays clear of place settings.
Low arrangement height = Centrepiece diameter × 0.4 — kept under ~30cm so guests can talk across the table.
Tall display height = Table diameter × 0.5 — raised above ~60cm so guests can see underneath; anything in between blocks sightlines.
Total stems = Stems per table × Number of tables.
Rectangular (trestle) tables
Long tables get a runner of several small arrangements (about one every 90cm of length) rather than one round-table-sized piece, each sized to roughly a third of the table width. Stems, vases, candles and cost all scale with the number of arrangements.
Cost basis
Estimates use a DIY/wholesale average of ~£1.50 per mixed stem plus a per-arrangement container/foliage cost, and ~£2 per accent tea light. A florist-arranged centrepiece typically runs 2–3× this, with premium stems (roses, peonies) at £3–4+ each.
Frequently Asked Questions
A centrepiece should be no more than one-quarter to one-third of the table diameter. For a 150cm round table, that means 35-50cm wide. This leaves enough room for place settings, glasses and serving dishes. Too large and guests cannot see each other or reach food.
Low arrangements should be under 30cm so guests can talk across the table. Tall arrangements should be above 60cm so guests can see underneath. Anything in between blocks sightlines. Low arrangements are more popular for dinner parties as they encourage conversation.
A small low arrangement needs 10-15 stems. A medium arrangement needs 15-25 stems. A large or tall arrangement may need 20-35 stems. Mix focal flowers (roses, peonies) with filler flowers (gypsophila, wax flower) and greenery for a full look.
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Last updated: March 2026
All calculations are estimates. Adjust quantities based on your guests and event type.