Recalculate and verify ACH batch and file control values. Free, no signup, and your file is processed locally in your browser.
Primary topic: ACH control calculator
The ACH control calculator recalculates NACHA batch and file control values from the underlying entries and addenda. Use this ACH control calculator as a practical first step, then review its results carefully. matching controls prove internal arithmetic consistency, not the validity or authorization of payment details.
A reliable ACH control calculator workflow starts by confirming the business purpose before changing or exporting any data. This page is designed for recalculates NACHA batch and file control values from the underlying entries and addenda. It performs the supported work locally, so the source does not need to be sent to a conversion service. Use the ACH control calculator with an approved source and a clearly defined expected result.
Start with an ACH file whose stored counts, hashes, debit totals, credit totals or block count need verification. Work from a copy, preserve leading zeros and remove unrelated report headings or totals that could be mistaken for transaction data.
Use the on-page controls, then compare the displayed batch count, entry count, total debits and total credits with the source expectation. Investigate warnings instead of assuming that a downloadable result is correct.
The expected result is calculated control values and a comparison with the values currently stored in the file. Before transmission or downstream import, review entry and addenda counts, the low-order ten digits of the routing hash, totals, batch count and block count, save the source separately and follow your organization’s approval process.
Confirm that the selected input really contains an ACH file whose stored counts, hashes, debit totals, credit totals or block count need verification. A renamed extension does not convert a spreadsheet, PDF or binary export into a valid ACH-related source.
Compare entries one batch at a time. Missing rows, duplicated rows, amount scaling, debit-versus-credit selection and malformed addenda can all change counts or monetary totals.
Format validation does not verify enrollment or bank policy. matching controls prove internal arithmetic consistency, not the validity or authorization of payment details. Ask the ODFI for the rejection code and compare it with the company profile, identifiers and processing date.
It recalculates NACHA batch and file control values from the underlying entries and addenda. The ACH control calculator processes the data locally in your browser and does not require an account.
It needs an ACH file whose stored counts, hashes, debit totals, credit totals or block count need verification. Files remain on your device during processing.
You will get calculated control values and a comparison with the values currently stored in the file. Review the result before using it in an operational workflow.
Check entry and addenda counts, the low-order ten digits of the routing hash, totals, batch count and block count. Also remember that matching controls prove internal arithmetic consistency, not the validity or authorization of payment details.
It can report many record-level problems when the file remains parseable. Severely truncated, binary or incorrectly encoded input may need to be exported again before reliable analysis is possible.
An error identifies a structural or arithmetic problem likely to require correction. A warning calls attention to unusual or bank-dependent data that needs human review but may still be accepted.
No. Structural checks cannot confirm receiver authorization, account ownership, available funds, processing deadlines or the terms of your agreement with the financial institution.
Retain the source file according to your security policy and document the review outcome. Focus on entry and addenda counts, the low-order ten digits of the routing hash, totals, batch count and block count, along with any operational decisions made from the report.
Technical explanations are checked against these primary sources. Bank-specific requirements can be narrower than general format guidance.
Sources reviewed August 20, 2026. Nacha owns and maintains the linked materials.
ACH files use the NACHA fixed-width format: every record is 94 characters, files contain one or more batches, and control records reconcile entry counts, routing-number hashes, debits and credits. Always confirm bank-specific settings with your financial institution before uploading a production file.