NFC Tag Capacity Calculator
Calculate usable NDEF storage capacity for NFC Forum Tags. Accounts for NDEF TLV overhead, CC bytes (Capability Container), Lock Control bytes, and record header flags. Essential for NFC tag selection and NDEF message sizing before writing to physical tags.
1. Select NFC Tag
2. NDEF Message Content
Each record adds overhead: 1 flag byte + 1 type length + 1-4 payload length bytes + type field + optional ID. Typical overhead per record: ~5-10 bytes plus RTD type bytes.
NDEF TLV wrapper: T=0x03 (1B) + L (1-3B) = 2-4 bytes overhead.
CC bytes: Already accounted in tag usable capacity.
Lock bytes: Already accounted in tag usable capacity.
CC bytes: Already accounted in tag usable capacity.
Lock bytes: Already accounted in tag usable capacity.
3. Result
Select a tag type and set your message size
NFC Forum Tag Comparison
| Tag / Chip | NFC Forum Type | Total Memory | Usable NDEF | CC + Lock | Max NDEF Size | Common Use |
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