How to make bath bombs recipe and what each one costs

This recipe costs about $1.52 a bath bomb to make, at the cheapest packs from stores in the United States, plus your own cornstarch, oil and essential oil or fragrance. Prices checked November 2, 2026.

Homemade

$1.52 a bath bomb

6 bath bombs from one 860 gram batch + your cornstarch, oil and essential oil or fragrance

Store-bought a bath bomb

Stores: United States · 140 grams a bath bomb · 1 batch · skin safe gradesChange

Stores in

Grams per bath bomb

Buy enough for

It goes on skin: price only food, cosmetic and pharmacy grades

$4.27

Buy 1 × 454 grams for $4.84 at Wholesale Supplies Plus. 53.6 grams left over.
$3.74

Buy 1 × 454 grams for $8.48 at Wholesale Supplies Plus. 254 grams left over.
$1.14

Buy 1 × 907 grams for $10.30 at Essential Depot. 807 grams left over.
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Free.

One batchPlus your cornstarch, oil and essential oil or fragrance: $9.14
Buy todayWhole packs, before shipping. Enough for 1 batch.: $23.62

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Use at your own risk. These recipes and prices are general information, not safety, medical or legal advice. Wear gloves and eye protection, never mix with bleach or other cleaners, and keep it away from children and pets.

More safety notes

Prices are a guide. In-stock pack prices from 28 stores, checked November 2, 2026, in US dollars without shipping or tax. The store's page is the final word.
Read the safety data sheet for each product, work in fresh air, and label every jar. Homemade cleaners look like sugar or salt.
Patch test anything for skin. Stop if it stings or itches. Washing soda and borax are for laundry and dishes, never for skin.
Selling what you make? Cosmetics and cleaners have their own label and safety rules, such as the FDA's in the United States, Health Canada's, and a safety assessment in the European Union and the United Kingdom.
Only household recipes. The calculator prices a fixed list of cleaning and bath ingredients. We never price or give recipes for anything dangerous or illegal to make. See our terms.

How to make it

For one batch, about 6 bath bombs: 400 grams baking soda, 200 grams citric acid, 100 grams Epsom salt, 100 grams cornstarch, 40 grams oil (coconut, almond or olive), 10 grams essential oil or fragrance and 10 grams water or witch hazel.

Mix the dry part. Whisk the baking soda, citric acid, Epsom salt and cornstarch in a dry bowl. Break up any lumps.
Mix the wet part. In a small cup, mix the oil, the fragrance and any colour.
Combine slowly. Drizzle the wet part in while you whisk. Mist with water or witch hazel until it holds together like damp sand when squeezed. Too much and it fizzes now, not in the bath.
Pack and dry. Press it firmly into moulds, tip out after a few minutes, and dry for 24 to 48 hours before you wrap them.

Questions

How much does it cost to make a bath bomb?

About $1.52 a bath bomb with this recipe, at the cheapest skin safe packs from stores in the United States we compare, checked November 2, 2026. Oil and fragrance are extra, at what you pay for them.

What makes a bath bomb fizz?

Baking soda and citric acid. They react when they hit the water. Use about 2 parts baking soda to 1 part citric acid by weight.

How long do bath bombs take to dry?

24 to 48 hours in a dry room. Humid air can set off the fizz early, so wrap them once they are hard.

More recipes, priced

How it works: each ingredient is priced at the cheapest whole packs that cover the amount, from one store, in US dollars at European Central Bank rates of 2026-11-02, without shipping or tax. Kitchen items like soap and oil use the price you type.