Why is my matcha bitter?

Matcha Guide

Why is my matcha bitter?

By FUJI ASAHIEN · 7 min read

The Short Answer

Matcha tastes bitter mainly because of water that is too hot, too much powder, or a lower-grade product. Fix the temperature (70–80 °C / 158–176 °F), use the right ratio, and choose a higher grade — and bitterness drops dramatically.

A bowl of freshly whisked matcha with visible foam

Proper preparation technique makes all the difference between bitter and smooth matcha.

Why matcha has a bitter taste: the science

Matcha's bitterness comes from two main groups of compounds naturally present in tea leaves: catechins (a type of polyphenol, most notably EGCG) and caffeine. These are the same compounds responsible for matcha's celebrated health benefits — so a small degree of bitterness is actually a sign of quality and potency.

However, catechins and caffeine are both highly sensitive to heat. When water is too hot, they are extracted far more aggressively, flooding the cup with bitterness that overwhelms matcha's natural sweetness and umami. The amino acid L-theanine — responsible for matcha's characteristic smooth, sweet undertone — is much more delicate and can be degraded at high temperatures, meaning bitter compounds dominate.

The 5 most common causes of bitter matcha

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Water too hot

Boiling water (100 °C) causes aggressive catechin extraction. Even 85 °C is often too hot. Ideal range: 70–80 °C.

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Too much powder

Using 3–4 g instead of the recommended 1.5–2 g per cup concentrates bitter compounds. More is not always better.

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Lower-grade matcha

Culinary or lower grades contain more stems and veins ground in, which are naturally more bitter than the shaded leaf flesh alone.

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Old or stale matcha

Oxidation changes matcha's flavour profile over time, reducing sweetness and making bitterness more prominent. Always use within 4–8 weeks of opening.

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Under-whisking

Clumped powder sits in concentrated pockets that hit the palate all at once. Proper whisking distributes compounds evenly and creates foam that softens the taste.

Matcha being prepared with a bamboo whisk

A bamboo chasen (whisk) used in brisk W-shaped strokes creates the fine foam that mellows matcha's bitterness.

How to reduce bitterness: preparation fixes

The good news is that most bitterness problems are entirely fixable with small adjustments to how you prepare your matcha. The table below summarises the key variables, what goes wrong, and the easy fix.

Variable	Bitter mistake	The fix	Difficulty
Water temperature	100 °C boiling water	Let boiled water cool for 3–4 min, or target 70–80 °C	Easy
Powder amount	3+ grams per cup	Use 1.5–2 g (1 chashaku scoop) per 60–80 ml water for usucha	Easy
Sifting	Skipping the sieve	Sift matcha through a fine-mesh sieve before whisking to break up clumps	Easy
Whisking technique	Slow circular strokes	Whisk vigorously in a W or M shape for 20–30 seconds until foam forms	Practice
Water volume	Too little water (30 ml)	Use 60–80 ml for usucha (thin matcha); diluting slightly reduces perceived bitterness	Easy
Grade & freshness	Old culinary-grade	Choose ceremonial or premium grade; consume within 4–8 weeks of opening	Easy

Temperature Quick Guide

100 °C — Too hot. Maximum catechin extraction, minimal sweetness. | 80 °C — Good for standard usucha. | 70 °C — Ideal for premium / ceremonial grade. Most L-theanine preserved. | Below 60 °C — Too cool; powder won't suspend well.

For beginners: how to enjoy matcha without the bitterness

If you are new to matcha or simply prefer a milder flavour, there is no need to push through a bitter cup. Adding a small amount of milk, natural sweetener, or flavouring is entirely traditional — even in Japan, matcha lattes and sweetened matcha drinks are hugely popular. Here are the best beginner-friendly options.

Does matcha grade affect bitterness?

Yes — significantly. Matcha grade directly reflects which part of the tea leaf was used and how it was processed.

Ceremonial-grade matcha is made exclusively from the youngest, most shaded leaf tips (tencha). These leaves are highest in L-theanine (sweetness/umami) and have a softer, lower-bitter profile, making them ideal for drinking straight.

Culinary-grade matcha includes more mature leaves, stems, and veins. These parts of the plant naturally contain more bitter compounds and less L-theanine, resulting in a sharper, more astringent flavour. Culinary grade is excellent in baked goods and recipes where bitterness is balanced by sugar and fat — but it is less pleasant as a straight drink.

Beginner recommendation

If you are new to drinking matcha straight, start with a premium or ceremonial grade. The higher L-theanine content makes for a naturally sweeter, smoother cup that is far more approachable than culinary grade — and good preparation technique matters even more than grade.