Data & method: Pure arithmetic on your own numbers, whole batches rounded up; the 3-batches-per-bowl mixing threshold matches the recipe scaler's.
Every number is checked by an automated test against its source. How we calculate →
Tap ↑ Share at the bottom of Safari, then
Add to Home Screen. CrumbCalc then opens like an
app and keeps working with no signal.
The cookie exchange math, worked once
A cookie exchange (or cookie swap) is simple until the arithmetic isn't: every participant
bakes one kind of cookie and takes home an assortment. The count is people × dozens each — 144 cookies for 12 people taking a
dozen each. Divide by what one batch of your recipe yields (say 30) and you get 4.8 batches — which means baking 5 whole batches, leaving 6 spare for the baker.
Rounding up isn't optional: arriving short at a swap is the one unforgivable outcome, and
spare cookies have never once been a problem.
Why batches, not one giant multiply
Up to about 3× in one bowl, scaling a cookie recipe straight works. Past that, creaming
butter and sugar stops being even — the bottom of a huge bowl mixes differently from the
top, and the last sheet bakes noticeably unlike the first. The planner splits anything
bigger across bowls of three batches or fewer; if you'd rather scale the written recipe
once per bowl, the recipe scaler rewrites every line with
kitchen-friendly fractions (and carries the same 3× warning, because the two tools share
their math).
Holiday batch-baking, without the chaos
Weigh the flour. Cup-measure error compounds across batches — at 3× a 5%
scoop error is a third of a cup of extra flour. The cups-to-grams converter turns any recipe
line into grams.
Out of something mid-bake? The substitutions page has measured
swaps for buttermilk, cake flour, brown sugar and eleven other staples.
Chill between sheets. Later sheets of a big session bake with warmer,
softer dough and spread more — portion, then refrigerate what's waiting.
Multiply the number of participants by the dozens each takes home. Twelve people taking one dozen each is 144 cookies; taking half a dozen each, 72. Many swaps also set aside a plate for sampling on the day — add one more 'person' to cover it.
How many dozen does each person bring to a cookie swap?
There's no single rule — the host sets it. Common formats: everyone brings a half dozen or a dozen per participant, so every guest leaves with a full assortment. This calculator takes whatever your invitation says and turns it into batches.
Should I bake extra cookies beyond the count?
The calculator already rounds up to whole batches, and the leftover from that rounding is your spare. If the rounding happens to come out exact (zero spare), consider one extra batch — broken cookies, sampling and 'quality control' are real.
Can I just multiply my recipe instead of baking batches?
Up to about 3× in one bowl, yes — beyond that, creaming butter and sugar stops being even and the last cookies differ from the first. Past 3 batches, this planner splits the mixing into multiple bowls; the recipe scaler applies the same warning.
How far ahead can I bake cookies for an exchange?
Most drop and cutout cookie doughs freeze well for weeks — many bakers freeze portioned dough and bake fresh the day before, which beats freezing baked cookies for texture. Bake times don't change from a scaled batch as long as you don't crowd the sheets.
