Cardmaking Basics: Sizing, Scoring, and Your First Card

A handmade card is one of the most satisfying small projects there is: an hour’s work, a short list of materials, and something a person keeps. The craft rewards a little planning at the start, though, mostly around sizes. Get the base and the envelope right and everything else is decoration.

Pick a size that fits an envelope

The single most useful habit in cardmaking is to design around an envelope you can actually buy or make. The most popular size is the A2 card, which finishes at 4.25 by 5.5 inches (about 108 by 140 mm) and slips into a standard A2 envelope. You get an A2 base from a single sheet of US Letter cardstock: cut an 8.5 by 11 inch sheet in half to 5.5 by 8.5, then fold it to 4.25 by 5.5. Other common sizes are A6 and A7, used for invitations. If you would rather start from the card and work outward, the card & envelope size calculator gives you the envelope and the flat blank to cut for any finished size.

Choose a proper card weight

A card base needs to stand up on a mantelpiece, so reach for cover-weight cardstock, roughly 216 to 300 gsm (about 80 to 110 lb cover). Lighter text-weight paper flops over; much heavier board is hard to fold cleanly by hand. Save the thin, pretty patterned papers for layering on top of a sturdy base rather than for the base itself.

Score, don’t just fold

Heavy cardstock cracks along a fold if you simply bend it, because the fibres on the outside of the bend stretch and split. The fix is to score first: press a blunt stylus along the fold line against a scoring board, creating a shallow groove and a matching raised ridge on the other side. Fold with the raised ridge tucked to the inside of the fold, then run a bone folder along the closed crease to set it. The result is a sharp, unbroken spine instead of a ragged white line. If you do a lot of this, a scoring board pays for itself quickly; a bone folder and a ruler will get you started.

A layout that always works

If you are unsure how to arrange a card, borrow a simple rule designers lean on: layers and a little breathing room. Start with the base, add a slightly smaller panel of patterned paper leaving an even border all around (this is called matting), then place your focal element — a stamped image, a die-cut, a sentiment — slightly off-centre rather than dead middle. Three layers and one clear focal point reads as considered; a dozen competing elements reads as busy. Leave some empty space; it makes everything else look intentional.

Buying an envelope versus making one

Once you know the interior size you need, you have two paths. Buying is simplest for the standard sizes — A1 (4-bar), A2, A6, A7, and A9 are all widely stocked, so if your finished card is close to one of those, checking your target against the nearest standard size (which the card & envelope size calculator will find for you) means you can order a box of ready-made envelopes rather than cutting your own. Making your own is worth it when your card is an unusual size, when you want the envelope in matching or contrasting paper, or when a bought size is close but not quite right — a card slightly too big for one standard size and too small to need the next one up. A handmade envelope also lets you choose lighter paper than a card base, since an envelope only needs to fold and hold, not stand upright on its own.

Proportions that read as balanced

Beyond the envelope fit, the finished card’s own proportions affect how considered it looks before you have added a single decoration. A card noticeably taller than it is wide, or the reverse, generally reads as more elegant and intentional than one close to square — which is part of why A2 (108×140 mm, roughly a 3:4 ratio) and A7 (127×178 mm, closer to 5:7) are both popular standard shapes, while a perfectly square card takes more deliberate design work to avoid looking static. None of this is a rule you must follow, but if a card layout feels a little flat and you cannot say why, checking whether the base itself is close to square is a good first place to look before blaming the decoration on top of it.

Glue and finishing

Use the right adhesive for the job. A glue stick or double-sided tape is clean and flat for paper-on-paper layers; foam squares lift a focal element for a little shadow and depth; a fine wet glue like PVA is best for small embellishments. Whatever you use, keep it away from the edges where it can squeeze out, and press each layer down firmly with a bone folder so nothing peels later.

Matching a card to its envelope, precisely

“It should fit” is not really a size. A card that is exactly the same size as its envelope’s interior will not go in without creasing the corners, so envelopes are cut a little larger on purpose. For a 108×140 mm finished card (the standard A2 size), a comfortable everyday fit adds about 6 mm of clearance to each dimension, giving an envelope interior of roughly 114×146 mm; a snugger, more formal fit adds only about 3 mm, for 111×143 mm. Too little clearance and the card drags and creases going in; too much and it slides around and looks sloppy once addressed. Our card & envelope size calculator works this out for whatever finished size you are making, at a snug, standard, or roomy fit, so you know the interior dimension to look for — or to cut, if you are making your own envelope too.

Why a perfectly square card is trickier than it looks

Square cards look striking, but they are a genuine sizing headache, because standard envelope ranges are built around rectangles. Feed a 120×120 mm square card through a standard-envelope match and the smallest one that will actually contain it is an A7 — sized for a 127×178 mm card — which swallows a square card in a lot of extra length it does not need. If you love the square look, budget for either a specialty square envelope or a custom-cut one; do not assume the next size up in a standard range will look intentional, because it will look like a rectangle with a square card rattling around inside it.

Cutting the blank so the fold lands exactly where you plan

Before you can fold a card, you need a flat blank cut to the right total size, with the fold planned in the right spot — and that depends on which way the card folds. A side fold (the hinge running top to bottom, like a book) needs a blank exactly twice as wide as the finished card and the same height, scored down the middle: for a 108×140 mm finished card, that is a 216×140 mm blank, scored at the 108 mm mark. A top fold (the hinge running side to side, opening like a greeting card that stands upright) instead needs a blank twice as tall, scored across the middle: a 105×148 mm finished card needs a 105×296 mm blank, scored at 148 mm. Getting the fold direction backwards is one of the most common cardmaking mistakes, because both blanks are the same total area — only the orientation of the score line changes, and that is exactly what our card & envelope size calculator lays out before you touch a blade.

A note on weight and posting a card

If a finished card is going in the mail, its weight and thickness are not purely a design choice — they can affect postage. A single-layer card in ordinary cover weight rarely causes trouble, but stacking on heavy embellishments, multiple thick layers, or a chunky die-cut can push a card past a standard letter’s weight or thickness allowance and into a higher, sometimes much higher, postage tier, and an unusually shaped or square envelope can attract its own surcharge on some postal services. None of the figures involved are worth guessing at here, since they vary by postal service and change over time — the practical habit is simply to weigh a finished, stuffed envelope on a kitchen scale and check current rates before you print or buy a batch of stamps for a whole run of cards.

Plan a batch before you cut

If you are making cards for a set — a run of thank-you notes or holiday cards — work out how much cardstock you need before you start cutting so you are not one sheet short of matching stock. A large parent sheet yields several bases, and the paper quantity calculator will tell you how many pieces come off each sheet and how many sheets the whole batch takes, with a little waste built in.

That is genuinely the whole foundation: a base sized to an envelope, cut from cover-weight stock, scored rather than bent, and decorated in a few clean layers. Master that and you can copy almost any card design you admire, because the structure underneath is always the same.