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LJ HairLab

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Rice Water Rinse Calculator

Get a rice water for hair recipe with measured rice and water, soak or ferment time, time on your hair and a use-by date for the batch.

2 cups covers most heads. Use 1 cup for short hair.

How will you make it?
Your hair porosity
Does your hair go stiff or straw-like after protein treatments?

Used for the use-by date of the batch.

How to use the Rice Water Rinse Calculator

  1. Enter how much rinse you want

    Type the amount in cups or milliliters. Two cups covers most heads; one cup is enough for short hair.

  2. Choose how you will make it

    Pick the quick soak, the boiled method or the fermented method. The quick soak is the mildest.

  3. Describe your hair

    Choose your porosity and say whether your hair goes stiff after protein treatments. Both shorten or lengthen the time on your hair.

  4. Press “Get my rice water recipe”

    You get the rice and water amounts, the soak or ferment time, how long to leave it on, how often to use it and a use-by date.

  5. Follow the steps and watch your hair

    Rinse it out, follow with conditioner, keep the rest in the fridge and stop if your hair turns stiff or brittle.

How to use the Rice Water Rinse Calculator (54 s)

How this rice water for hair recipe is worked out

Rice water is the cloudy water left after rice has soaked, boiled or fermented. It carries starch and small amounts of protein and minerals from the grain. The calculator turns the amount of rinse you want into a measured recipe, then sets the time on your hair from your porosity and how your hair handles protein. 

rice water needed = rinse you want × 1 (or × 0.5 when diluted)
water to start    = rice water needed ÷ share you get back after straining
rice              = water to start ÷ parts of water per part of rice
use by            = day you make it + 7 days

Three methods

The quick soak uses 1 part rice to 4 parts water and is used as it is. Boiling pulls out much more starch, so it starts with 1 part rice to 6 parts water and the strained water is cut half and half with plain water. Fermented rice water is soaked first, then left at room temperature for 12 to 24 hours and diluted the same way. Do not ferment it longer than about 24 hours: after that it belongs in the fridge.

Rice holds on to some of the water. The calculator assumes you get back about 90% after a soak and about 60% after boiling. These are estimates, so if you end up a little short, top up with plain water.

Time on your hair

Low porosity hair coats quickly, so it gets the shortest time and a monthly schedule. High porosity hair gets the longest time and can use the rinse weekly. If your hair goes stiff after protein treatments, the tool steps the time down, dilutes even the quick soak and spaces rinses a month apart. Not sure which you are? The hair porosity test and the protein or moisture quiz will tell you.

What the evidence says

Be realistic about rice water. Support for it is mostly anecdotal: personal reports and tradition, not controlled hair studies. There is no tested "dose", so every ratio and time on this page is a kitchen rule of thumb taken from common recipes. Some people find their hair feels smoother and stronger. Others get stiff, dry hair, especially with frequent use.

What this calculator cannot tell you

It cannot promise growth or repair, and it cannot see how your hair reacts. Stop if your hair turns stiff or brittle, and go back to a moisturizing deep conditioner. If you would rather build a softer kitchen treatment, try the DIY hair mask builder. For an itchy, sore or flaking scalp, skip home rinses and see a board-certified dermatologist.

Rice water ratio and timing chart

Method Rice : water Time Rice Water Plain water to add
Quick soak 1 : 4 Soak 30 minutes ½ cup + 1 tbsp 2¼ cups none
Boiled 1 : 6 Simmer 10 minutes ¼ cup 1½ cups + 3 tbsp 1 cup
Fermented 1 : 4 Ferment 12–24 hours ¼ cup 1 cup + 2 tbsp 1 cup

Amounts for 2 cups (473 ml) of finished rinse. Rice is measured uncooked, by volume.

How long to leave it on, and how often

Hair Leave on If hair goes stiff after protein How often, at most
Low porosity 3–5 min 2–3 min, once a month once a month
Normal porosity 5–10 min 3–5 min, once a month every 2 weeks
High porosity 10–20 min 5–10 min, once a month once a week

Keep any batch in the fridge and throw it out after 7 days.

Frequently asked questions

What is the rice to water ratio for rice water for hair?
Most recipes use 1 part uncooked rice to 4 parts water for a soak, which is half a cup of rice in 2 cups of water. The boiled method uses more water, about 1 part rice to 6 parts water, because the rice absorbs some while it cooks.

How long should I leave rice water in my hair?
Between 2 and 20 minutes, then rinse it out. Low porosity hair and hair that goes stiff after protein should stay at the short end, 5 minutes or less. Leaving it on for hours or overnight does not add a benefit and makes stiffness more likely.

How often can I use a rice water rinse?
Once a week at most for high porosity hair, every two weeks for normal porosity and about once a month for low porosity or protein-sensitive hair. If your hair starts to feel hard, dry or brittle, stop and go back to moisturizing conditioners.

How long does rice water last in the fridge?
About a week in a closed jar. It has no preservative, so throw it out sooner if it smells rotten, looks slimy or grows mold. Fermented rice water should not sit at room temperature for more than about 24 hours.

Does rice water make hair grow?
There is no good evidence that it does. Support for rice water is mostly personal reports. The starch can coat the hair so it feels smoother and stronger for a while, which may reduce breakage for some people, but it does not change how fast hair grows from the scalp.

Is fermented rice water better than plain rice water?
It is stronger smelling and more acidic, not proven better. If you are new to rice water, start with the quick soak. It is the mildest version and the easiest to make safely.

Why does my hair feel stiff after rice water?
The starch and the small amount of protein in rice water sit on the hair like a light coating. Too much, too often, or on hair that dislikes protein leaves it stiff. Clarify, deep condition and take the protein or moisture quiz before trying again.

Sources

Last data update:

This page relies on the reasoning described above rather than external studies.

How we research and update pages: editorial policy. Spotted an error? Tell us.

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