Comment fonctionne cette calculatrice
Le Calculateur de coût de l'API SMS estimates your total monthly SMS spend by multiplying three inputs: the number of messages you send per month, le price per message charged by your SMS API provider, and the average number of segments per message. Segments matter because carriers bill in fixed chunks—typically 160 characters for plain text (GSM-7) or 70 characters for messages containing emoji or special characters (UCS-2). A message longer than one segment is split and billed as multiple messages, so a single 300-character text can cost two or three times the base per-message rate. The calculator combines these factors to show what your SMS program actually costs each month, rather than the deceptively low single-message price quoted on a pricing page.
The most useful thing this tool reveals is how segment count quietly multiplies your bill. Trimming a message from 165 characters to under 160, or dropping an emoji that forces UCS-2 encoding, can cut a message from two segments to one and reduce that portion of your spend by half. Before committing to a provider or a campaign volume, run your realistic average segment count—not the best case—since long links, unsubscribe footers, and merge fields all push messages past segment boundaries. Watch the trade-off between message length and cost: writing shorter, tightly encoded messages keeps you at one segment, while richer content that improves engagement may be worth the extra segments only if it lifts response rates enough to justify the added spend.
Questions fréquemment posées
Comment est tarifé les SMS ?
Par message, et un message long compte pour plusieurs segments (environ 160 caractères chacun), chacun facturé. Les tarifs varient également considérablement selon le pays de destination et selon que le numéro est un code long, gratuit ou un code court.
Comment réduire le coût des SMS ?
Conservez les messages sous un seul segment (160 caractères), envoyez-les uniquement lorsque cela est nécessaire et préférez les canaux moins chers (push, e-mail, WhatsApp) lorsque cela est possible. Dans de nombreux pays, les frais de transport s'ajoutent au tarif de base, la combinaison de destinations est donc importante.