Here is something that surprises many English learners: the letters CH don't always make the same sound. Depending on where a word originally came from, CH can be pronounced as /tʃ/ (like "church"), /k/ (like "chemistry"), or /ʃ/ (like "chef").
The good news is that there are clear patterns based on word origin. Once you learn these three rules, you will be able to predict the correct pronunciation most of the time.
The Three CH Sounds at a Glance
| Sound | IPA | Origin | Examples | How to Identify |
|---|---|---|---|---|
| CH as in "church" | /tʃ/ | Germanic / Old English | chair, child, cheese | Common, everyday words |
| CH as in "chemistry" | /k/ | Greek | character, chorus, chrome | Scientific, technical, or medical words |
| CH as in "chef" | /ʃ/ | French | machine, champagne, chic | Elegant, culinary, or fashion words |
Rule 1: The Default, CH = /tʃ/ (Germanic Words)
This is the most common pronunciation by far. If you are unsure how to pronounce CH in a word, /tʃ/ is your safest guess. These are everyday English words with Germanic or Old English roots.
The pattern: common, simple, everyday vocabulary.
More /tʃ/ words: choose, chicken, chapter, cheap, chart, chest, chief, chin, chip.
Rule 2: The Greek Pattern, CH = /k/
When English borrowed words from Greek, the Greek letter chi (X) was written as CH. But it was always pronounced as /k/.
The pattern: if the word looks or feels scientific, medical, technical, or academic, the CH is probably /k/.
More /k/ words: chrome, chronic, anchor, archive, epoch, orchestra, scheme, mechanic, technology, psychology.
Surprise /k/ Words
Some very common words have CH = /k/ even though they don't feel "scientific":
Both "school" and "stomach" actually do come from Greek (schola and stomachos), but they have been part of English for so long that they feel like everyday words.
The "-ache" Family
All words ending in -ache pronounce the CH as /k/:
| Word | IPA | Meaning |
|---|---|---|
| ache | /eɪk/ | a continuous pain |
| headache | /ˈhɛdeɪk/ | pain in the head |
| stomachache | /ˈstʌməkeɪk/ | pain in the stomach |
| backache | /ˈbækeɪk/ | pain in the back |
| toothache | /ˈtuːθeɪk/ | pain in a tooth |
The "arch-" Prefix: A Tricky Exception
The prefix "arch-" is not consistent:
- architect /ˈɑːrkɪtɛkt/ (CH = /k/)
- archive /ˈɑːrkaɪv/ (CH = /k/)
- archery /ˈɑːrtʃəri/ (CH = /tʃ/)
Why? "Architect" and "archive" come from Greek, but "archery" comes from Old French (archerie). The origin still determines the sound.
The Choir Surprise
"Choir" is one of the most surprising CH words. The CH is pronounced /k/, and the whole word sounds like "kwire." It comes from Greek through Old French.
Rule 3: The French Pattern, CH = /ʃ/
When English borrowed words from French, it often kept the French pronunciation of CH, which is /ʃ/ (the "sh" sound).
The pattern: if the word feels elegant, culinary, or related to fashion, the CH is probably /ʃ/.
More /ʃ/ words: charade, cache, crochet, chalet, chic, mustache, parachute, ricochet.
Quick-Reference Cheat Sheet
| Ask Yourself | If Yes, Then... | Sound | Examples |
|---|---|---|---|
| Is it a common, everyday word? | Default rule | /tʃ/ | chair, child, cheese, church |
| Does it feel scientific, medical, or technical? | Probably Greek | /k/ | chemistry, chronic, chorus |
| Does it end in -ache? | Greek origin | /k/ | ache, headache, stomachache |
| Does it feel elegant, culinary, or French? | Probably French | /ʃ/ | chef, champagne, chic |
| Not sure at all? | Go with the default | /tʃ/ | Most CH words are /tʃ/ |
Words with Dual Pronunciations
A few CH words are pronounced differently depending on the dialect or region:
| Word | American English | British English |
|---|---|---|
| schedule | /ˈskɛdʒuːl/ (CH = /k/) | /ˈʃɛdjuːl/ (CH = /ʃ/) |
| charade | /ʃəˈreɪd/ | /ʃəˈrɑːd/ |
Practice: Which Sound Is It?
Test yourself with these words. Try to guess the CH sound before reading the answer.
| Word | Your Guess | Answer | Why |
|---|---|---|---|
| chocolate | /tʃ/ | Common everyday word | |
| chronicle | /k/ | Greek origin (chronos = time) | |
| chandelier | /ʃ/ | French origin (elegant decor) | |
| technology | /k/ | Greek origin (techne = skill) | |
| parachute | /ʃ/ | French origin (para + chute) | |
| chicken | /tʃ/ | Common everyday word | |
| orchestra | /k/ | Greek origin (performing arts) | |
| mustache | /ʃ/ | French origin |
Memory Tips
- Default = /tʃ/: When in doubt, say /tʃ/. Most English words use this sound.
- Science = /k/: Think "chemistry class" to remember that Greek-origin academic words use /k/.
- Fancy = /ʃ/: Think "the chef drinks champagne" to remember that French-origin elegant words use /ʃ/.
- Pain = /k/: All "-ache" words (headache, stomachache, toothache) use /k/.
Final Thoughts
The three sounds of CH might seem random at first, but they follow a clear historical logic. Germanic words get /tʃ/, Greek words get /k/, and French words get /ʃ/. With practice, you will start to feel which category a word belongs to, and the correct pronunciation will come naturally.
For more practice with the CH and SH sounds, check out our guide on CH vs. SH sounds in English.