The Maker Bench · Craft Tool
Wax Seal Bead & Melting Calculator
Never guess spoon wax amounts or ruin an envelope with overflowing edges. Calculate precise bead counts, weight, melting duration, and postal guidelines for 20mm, 25mm, 30mm, and custom stamp heads.
Stamp Size & Bead Reference Table
| Stamp Diameter | Clean Rim | Classic Lip | Plump Overflow | Best For |
|---|---|---|---|---|
| 20 mm (Mini) | 2 beads | 2–3 beads | 3 beads | Gift tags, place cards, RSVP cards |
| 25 mm (Standard) | 2–3 beads | 3–4 beads | 4–5 beads | Envelope flaps, wedding stationery |
| 30 mm (Large) | 4 beads | 5 beads | 5–6 beads | Monogram crests, ribbon wrapping, gift boxes |
Frequently Asked Questions
How many wax beads do I need for a 25mm stamp?
For a standard 25mm (1-inch) brass stamp head, use 3 to 4 octagonal beads. 3 beads create a tidy, clean edge; 4 beads produce a full, organic, raised rim that looks luxurious.
Why does my wax seal have tiny air bubbles?
Air bubbles mean the wax overheated in the spoon. Lift your melting spoon 1 to 2 inches higher above the tea light flame, and stir gently with a toothpick or stirring rod. The wax should flow like thick honey, not water.
Can I mail letters with wax seals through USPS?
Yes, but letters with wax seals on the outside envelope are classified as 'non-machinable' because sorting rollers can crack the seal or jam the sorting machine. You must add the USPS Non-Machinable Surcharge (or hand-cancel at the counter), or place the sealed envelope inside a larger protective outer envelope.
How do I calculate wax for 50 or 100 wedding invitations?
Multiply your beads-per-seal by the invitation count and add 10% for test pours. For 100 invitations using a 25mm stamp (at 3.5 beads average), you need about 385 beads, which is approximately 115 grams (or 2 standard 60g bags).