Any run of characters separated by spaces or line breaks counts as one word, the same way most word processors count. Hyphenated words like "well-known" count as one.
How is reading time calculated?
Reading time assumes about 238 words per minute, the average silent reading speed for adults. Speaking time assumes about 130 words per minute, a comfortable pace for a talk.
Is my text saved or uploaded?
No. Counting happens entirely in your browser. Nothing you type is sent anywhere.
What are common length limits?
Meta descriptions are usually trimmed around 155–160 characters, X (Twitter) posts allow 280 characters for standard accounts, and many college essays ask for 500 to 650 words.