How is the EDRPOU control digit calculated?

Multiply the first seven digits by a weight array and take the sum modulo 11. The array is 7,1,3,7,1,3,7 when the code is between 30000000 and 60000000, otherwise 1,2,3,4,5,6,7. If the result is 10, the calculation repeats with each weight increased by 2.

Why are there two weight arrays?

The official algorithm uses 7,1,3,7,1,3,7 for codes in the 30000000-60000000 band and 1,2,3,4,5,6,7 for all others. A separate secondary array resolves the rare case where the primary modulo-11 result is 10.

What happens when the result is 10?

A control digit cannot be 10, so the algorithm recomputes with each weight raised by 2. If that result is also 10, the control digit is defined as 0; otherwise it is that second result.

Does a valid control digit mean the company is registered?

No. A valid control digit only confirms the code is internally consistent. To confirm a company is currently registered, check the official USREOU register.

Is my EDRPOU sent anywhere?

No. The check runs entirely in your browser, so the code never leaves your device and nothing is logged or transmitted.

Ukraine EDRPOU Validator

The EDRPOU is the 8-digit identifier in Ukraine’s Unified State Register of Enterprises and Organizations (USREOU). It appears on every company’s documents and is required for ProZorro procurement and Ukrainian e-invoicing. The final digit is a modulo-11 control digit, so a single mistyped digit is detectable. This free validator runs the exact algorithm in your browser.

How it works

The official control-digit algorithm operates on the first seven digits:

Choose the primary weight array: 7,1,3,7,1,3,7 when the code is between 30000000 and 60000000, otherwise 1,2,3,4,5,6,7.
Multiply each of the first seven digits by its weight and sum the products.
Take the remainder control = sum mod 11.
If control equals 10, repeat steps 2-3 with each weight increased by 2 (so 9,3,5,9,3,5,9 or 3,4,5,6,7,8,9). If that result is also 10, the control digit is 0; otherwise it is that result.
The code is valid when the eighth digit equals the control digit.

Example

For 14360570 the code is outside the 30000000-60000000 band, so the weights 1,2,3,4,5,6,7 apply to 1 4 3 6 0 5 7, giving a sum of 121. 121 mod 11 = 0, so the expected control digit is 0, which matches the eighth digit — valid.

A valid control digit confirms the code is well-formed, not that the company is registered. All processing stays on your device.