Inputs
Quantity 2, unit value 12.50, and unit net weight 0.75.
Review Production · exact zero tolerance
Check the math
before the paperwork moves.
Recompute anonymous invoice line values and net weights with exact decimal arithmetic.
Browser-onlyBigInt decimal mathNo invoice upload
Anonymous input
Recompute line by line.
Use 1–50 rows. Keep one weight unit throughout; the label is displayed only.
No result yet. Enter anonymous numbers, then run the check.
Worked example
One anonymous line, recomputed exactly.
Exact result
Line value 25; net weight 1.5; value difference 0; net-weight difference 0.
How to read it
Both differences are zero for these copied numbers, so the declared value and net weight mechanically agree with the recomputed line. That agreement does not validate the invoice, classification, origin, tax treatment, customs treatment, or acceptance.
A visible method
Every number stays inspectable.
Copy only numbers
Use anonymous strings from your own document. This page does not accept names, descriptions, addresses, identifiers, or free text.
Recompute exactly
Products, totals, and differences use coefficient/scale arithmetic with zero tolerance. There is no currency conversion or rounding.
Read the boundary
A mechanical difference or gross/net warning is a prompt to recheck copied values, not a legal or customs conclusion.
Read this beside every result
A math check, not a declaration.
Arithmetic agreement does not prove customs compliance, a correct declared value, origin, classification, or acceptance.
A private-by-default Production for checking copied numbers. It does not receive or create an invoice.
Source notes
Context, not validation.
3 published context notes are available only after an explicit button activation.
Reviewed 2026-08-28
- DHL commercial invoice field contextField context only; it does not define a universal destination rule.
- DHL import-document field contextField context only; it does not validate a declaration or destination requirement.
- U.S. CBP commercial-invoice backgroundU.S. background only; not a general arithmetic or destination rule.
FAQ
What this arithmetic can—and cannot—show.
What does a zero difference mean?
It means the declared total equals the exact arithmetic recomputed from the anonymous numbers entered. It does not establish that the underlying invoice information is correct.
Does the checker apply tax or currency rules?
No. It performs multiplication, addition, subtraction, and gross-versus-net comparison without tax logic, currency conversion, or rounding rules.
Can I upload an invoice?
No. Enter anonymous numeric strings only; the page does not accept invoice files, names, addresses, identifiers, or free text.
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