Input JSON
{
"text": "Your order is packed and ready for collection. Please bring your collection code and check the items before leaving. Collection is available during normal opening hours. Thank you for shopping with us."
}Attest tools · Text Stats: words, characters, tokens and SMS segments
SMS segment calculator
Count the SMS segments for a long ASCII order notification and see the encoding and multipart limits.
Captured output JSON
{
"characters": 201,
"code_points": 201,
"utf16_units": 201,
"bytes_utf8": 201,
"words": 32,
"sentences": 4,
"paragraphs": 1,
"lines": 1,
"whitespace": 31,
"reading_time_minutes": 0.13,
"speaking_time_minutes": 0.17,
"time_basis": {
"reading_words_per_minute": 238,
"speaking_words_per_minute": 183
},
"tokens": {
"o200k_base": 36,
"cl100k_base": 36,
"note": "OpenAI tokenizers, per the model table in js-tiktoken 1.0.21: o200k_base is listed for GPT-4o, GPT-4o mini, GPT-4.1, GPT-4.5 Preview, o1, o3, o4-mini and GPT-5; cl100k_base for GPT-4, GPT-4 Turbo and GPT-3.5 Turbo. Other models, including other vendors', may tokenize differently, so treat these counts as estimates for them."
},
"sms": {
"encoding": "GSM-7",
"segments": 2,
"characters_per_segment": 153,
"units": 201,
"max_segments": 255,
"within_concatenation_limit": true,
"note": "GSM 7-bit default alphabet without national language shift tables; extension characters (^ { } [ ] ~ | \\ € and form feed) cost two. Code 0x09 is capital Ç in the 3GPP table, so small ç is counted as UCS-2, the encoding a gateway following that table sends; a gateway following Unicode's GSM0338.TXT accepts ç as one septet and may need fewer segments than reported. Multipart sizes assume (truncated)"
},
"limits": [],
"sources": [
{
"name": "Brysbaert, M. (2019). How many words do we read per minute? A review and meta-analysis of reading rate. Journal of Memory and Language, 109, 104047.",
"url": "https://doi.org/10.1016/j.jml.2019.104047",
"used_for": "reading_time_minutes (238 wpm, adult silent reading of non-fiction) and speaking_time_minutes (183 wpm, adult reading aloud)"
},
{
"name": "OpenAI tiktoken encodings o200k_base and cl100k_base (MIT), rank files from js-tiktoken (MIT)",
"url": "https://github.com/openai/tiktoken",
"used_for": "tokens"
},
{
"name": "3GPP TS 23.038 (GSM 7-bit default alphabet and extension table) and 3GPP TS 23.040 clause 9.2.3.24.1 (concatenated short messages)",
"url": "https://www.3gpp.org/ftp/Specs/archive/23_series/",
"used_for": "sms"
},
{
"name": "Unicode GSM0338.TXT mapping — cited only for the divergence at GSM code 0x09, which it maps to small c-cedilla where the 3GPP table draws the capital; we follow 3GPP",
"url": "https://www.unicode.org/Public/MAPPINGS/ETSI/GSM0338.TXT",
"used_for": "sms"
}
],
"notice": "General information only. Reading and speaking times are averages for adult English readers; individual rates vary.",
"checked_at": "2026-10-20T20:47:48.391Z"
}API call
curl -s -X POST https://getattest.com.au/api/v1/text/stats \
-H "authorization: Bearer $ATTEST_API_KEY" \
-H "content-type: application/json" \
--data-raw '{"text":"Your order is packed and ready for collection. Please bring your collection code and check the items before leaving. Collection is available during normal opening hours. Thank you for shopping with us."}'Run this call with your own bearer key. Issue an API key.
About this example
The input was validated and run locally through the registered service. The output above is a display preview of the captured service result. File bytes are described instead of printed, and strings longer than 400 characters are truncated; the HTTP API also adds call_id, credits_charged and credits_remaining. Timestamps and generated identifiers will vary.
Source: apps/api/svc/text_stats.mjs