Calculate two numeric check digits.
Initialising algorithm engine for ISO 7064 MOD 97-10 Calculator...
How ISO 7064 MOD 97-10 Calculator Works?
The ISO 7064 MOD 97-10 Calculator works by appending two zeros to the numeric payload, computing the remainder modulo 97, and subtracting that remainder from 98. The result is always a 2-digit check value between 02 and 98.
- 1Convert any letters to 2-digit numbers (A = 10 … Z = 35) when the payload is alphanumeric.
- 2Append 00 to the right of the numeric string.
- 3Compute the remainder of the large number modulo 97, processing 9 digits at a time.
- 4Subtract the remainder from 98.
- 5Pad the result to 2 digits (for example 7 becomes 07).
ISO 7064 MOD 97-10 Calculator Formula
The ISO 7064 MOD 97-10 formula is Check = 98 − ((N × 100) mod 97).
Check = 98 − ((N × 100) mod 97) Validation: (N × 100 + Check) mod 97 = 1
Nis the numeric payload.× 100makes room for the 2 check digits.
(0 + 7) × 10 mod 97 = 70 (70 + 9) × 10 mod 97 = 14 (14 + 4) × 10 mod 97 = 83 Extra step for 2 check characters: 83 × 10 mod 97 = 54 Check value = (97 + 1 − 54) mod 97 = 44 Check digits = 44 Complete string = 79444
ISO 7064 MOD 97-10 Calculator Conversion Table
The ISO 7064 MOD 97-10 conversion table shows letter-to-number values and sample payloads with their 2 check digits.
| Letter | Number | Sample payload | Check digits | Complete string |
|---|---|---|---|---|
| A | 10 | 794 | 44 | 79444 |
| B | 11 | 1234567890 | 92 | 123456789092 |
| C | 12 | 3704004405320130001314 | 89 | 370400440532013000131489 |
| D | 13 | 539007547034271500 | 52 | 53900754703427150052 |
| E | 14 | 0 | 01 | 001 |
| F | 15 | 98765432109876543210 | 09 | 9876543210987654321009 |
| G | 16 | 100 | 89 | 10089 |
What is ISO 7064 MOD 97-10 Calculator?
An ISO 7064 MOD 97-10 Calculator is a tool that computes the 2-digit check value defined by ISO/IEC 7064 with modulus 97 and radix 10. The check value catches all single errors, all adjacent transpositions, and about 99.97% of all other errors.
MOD 97-10 sits behind International Bank Account Numbers (IBAN, ISO 13616), Legal Entity Identifiers (LEI, ISO 17442), and RF creditor references (ISO 11649).
What are the uses of ISO 7064 MOD 97-10 Calculator?
There are 4 main uses of the ISO 7064 MOD 97-10 Calculator, including IBAN, LEI, and RF reference checks.
- IBAN check digits: Banks compute positions 3–4 of every IBAN.
- LEI check digits: Local Operating Units compute characters 19–20 of each LEI.
- RF creditor references: Billers add RF check digits to structured payment references.
- Code verification: Developers test big-integer modulo routines against ISO examples.