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💬 SMS & WhatsAppShort texts. Big returns.
SMS gets read, which makes it the easiest channel to overspend on and to over-send. Count segments, cost your sends and protect your list with these calculators.
working calculators on this page
on the SMS roadmap
How I approach SMS
Segment-smart copy
Keep messages within one GSM-7 segment so you don't pay double.
Compliant opt-in
Consent capture, quiet hours and clear STOP handling.
Cart & restock texts
Automated texts that recover revenue at the moment of intent.
WhatsApp Business
Catalogues, broadcasts and COD order confirmations.
SMS & WhatsApp calculators
Each one shows its formula, and the results update as you type. The default numbers are only examples, so replace them with your own.
Coming next to reach 40 SMS calculators
Questions, answered
How many characters fit in one SMS?
160 characters with standard GSM-7 encoding, or 70 if the message contains emoji or other Unicode characters. Longer messages split into parts of 153 (GSM-7) or 67 (Unicode) characters, each billed as a segment.
How do I calculate SMS marketing ROI?
Revenue = subscribers × click rate × click-to-order rate × AOV. Cost = subscribers × segments × cost per segment. ROI = (revenue − cost) ÷ cost.
What is 10DLC?
10DLC is the US registration system for business texting from standard 10-digit numbers. It has one-time brand and campaign fees plus monthly and per-message charges. Enter your provider's current fees into the 10DLC calculator.
Is WhatsApp cheaper than SMS?
It depends on your country and message length. Long SMS split into several billable segments, while WhatsApp charges per message. Compare both with your own rates in the WhatsApp vs SMS calculator.
Want me to look at your numbers?
Calculators show the maths. A session turns it into a plan for your business.