Free Calculator · Published October 2026
Nitrite Unit Converter: Nitrite-N to the Nitrite Ion
Put nitrite-nitrogen and the nitrite ion on the same basis before you compare either one to 1 mg/L as nitrogen.
Built by SubcontractorHub — the software plumbing contractors use to quote, finance, and run every job.
Book a DemoA Nitrite Unit Converter Uses 3.29
This nitrite unit converter follows the factor in the National Academies nitrate and nitrite report. The health context of the public 1 mg/L line is nitrite in well water. Nitrate stays on the nitrate unit converter.
Milligrams per liter. Micrograms belong on the other converter.
Nitrate does not belong in either choice.
Important: All calculator results are ballpark estimates
All calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements.
What the Nitrite Unit Converter Is Using
3.29 from nitrogen to the ion
The report says one milligram of nitrite-nitrogen per liter equals 3.290 milligrams of nitrite ion per liter. The page multiplies and divides by 3.29, which is that figure at two decimal places. It does not substitute 4.43. That factor belongs to nitrate. It does not substitute 3.3 as a second multiplier. The report uses 3.3 when it rounds the public MCL into milligrams of nitrite ion. One times 3.29 is 3.29, and the rounded MCL sentence is 3.3. Write the factor you used next to the result so the next reader does not think the water changed.
Worked examples
Each row is multiplication or division by 3.29. Nothing else is applied.
| Case | As nitrogen | As the ion |
|---|---|---|
| 1 mg/L nitrite-nitrogen | 1 mg/L | 3.29 mg/L |
| 0.5 mg/L nitrite-nitrogen | 0.5 mg/L | 1.65 mg/L |
| 3.29 mg/L nitrite ion | 1 mg/L | 3.29 mg/L |
The public 1 is as nitrogen
EPA's inorganic table lists nitrite at 1 mg/L measured as nitrogen. The opening of that regulations page says the standards apply to public water systems. A result of 3.29 mg/L as the ion is 3.29 divided by 3.29, which is 1 as nitrogen, on the public line rather than above it. The same digits read as nitrogen would be above 1. The nitrates in well water page is the neighboring 10 mg/L row. Do not add the ion forms and call the sum a nitrite result.
What to write on the job ticket
The entered value, the direction, both results, and whether the nitrogen-basis figure was above the public 1. Say the factor was 3.29. A water treatment dealer who saves that note will not re-argue the unit on the next visit. Milligrams and micrograms are a different scale, explained in milligrams and micrograms. This conversion does not size a device, does not state a removal percentage, and does not say the well passed a county rule.
Frequently Asked Questions
What does a nitrite unit converter change?
It converts between nitrite-nitrogen and the nitrite ion using 3.29. A National Academies report prints 1 mg of nitrite-nitrogen per liter as 3.290 mg of nitrite ion per liter. The reverse is division by 3.29. It does not convert nitrate.
Why is 3.29 not 3.3?
The report prints the factor as 3.290 and prints the public MCL equivalent as 3.3 mg of nitrite per liter. The page uses 3.29 so one milligram per liter as nitrogen shows 3.29 as the ion. Those are the same step at different decimals, not two waters.
Is 1 mg/L a private-well limit?
EPA's national primary drinking water regulations list nitrite at 1 mg/L measured as nitrogen. Those regulations apply to public water systems. This tool labels a nitrogen-basis result above 1 so you do not miss the public figure. It does not call a private well illegal.
Does this tool convert nitrate?
No. Nitrate uses 4.43 on the nitrate unit converter, and its public line is 10 mg/L as nitrogen. Typing nitrate into this nitrite unit converter will mis-state it.
Are micrograms handled here?
No. This page stays in milligrams per liter. A thousand-fold move between micrograms and milligrams is a different tool. Convert the scale first, then use 3.29 if the result is still nitrite.
Save the Nitrite Unit Next to the Lab
Nitrogen basis, ion basis, and the factor you used belong on the customer record.
Get a Free DemoAll calculations are estimates based on historical information and should be verified by the user. This tool is provided as a free service for planning purposes only and is not a substitute for a professional assessment, a supplier quote, or applicable local code requirements. It does not convert nitrate.