Convert ammonia measures for garden water and soil checks. Estimate free NH3, ammonium share, and safer application limits with clarity.
| Scenario | Input | Unit | pH | Temp °C | Volume | Comment |
|---|---|---|---|---|---|---|
| Reservoir Check | 1.20 | mg/L as NH3 | 6.8 | 20 | 150 L | Lower free ammonia share. |
| Warm Feed Mix | 2.00 | mg/L as N | 8.2 | 28 | 80 L | Higher NH3 risk. |
| Compost Tea Review | 0.75 | mg/L as NH4+ | 7.4 | 24 | 40 L | Moderate conversion case. |
1) Convert to total ammonia as nitrogen:
mg/L as N = mg/L as NH3 × (14.007 ÷ 17.031)
mg/L as N = mg/L as NH4+ × (14.007 ÷ 18.039)
2) Estimate acid dissociation constant:
pKa = 0.09018 + 2729.92 ÷ (273.15 + Temperature in °C)
3) Estimate free ammonia fraction:
NH3 fraction = 1 ÷ (1 + 10^(pKa − pH))
4) Estimate ammonium fraction:
NH4+ fraction = 1 − NH3 fraction
5) Final concentration outputs:
Free NH3 = total NH3 concentration × NH3 fraction
Ammonium NH4+ = total NH4+ concentration × NH4+ fraction
Ammonia conversion matters in gardening because nitrogen forms behave differently. A number that looks safe in one unit may seem risky in another. This calculator helps growers compare ammonia, ammonium, and nitrogen-based readings quickly. It also estimates the free ammonia share that can stress roots and soil biology.
Gardeners often test irrigation water, compost tea, liquid feed, or recirculating systems. Reports may list NH3, NH4+, or ammonia as nitrogen. These values are related, but they are not identical. Converting them correctly helps you judge toxicity, nutrient balance, and timing. Small mistakes can lead to plant stress or wasted inputs.
Free ammonia is usually the sharpest concern. Its share rises when pH climbs and when temperature increases. That means the same total ammonia reading can behave very differently across conditions. A warm alkaline solution can release more harmful NH3 than a cool slightly acidic one. This calculator reflects that shift.
The tool supports several useful outputs. You can convert to mg/L as NH3, mg/L as NH4+, and mg/L as nitrogen. You can also estimate free NH3 concentration, ammonium concentration, and total mass inside a bed or tank. These figures help with dosing, dilution, and troubleshooting.
Use the result with practical judgment. Very low free ammonia is generally easier on roots and microbes. Higher values may call for dilution, pH adjustment, or better aeration. Recheck after each change. Consistent monitoring improves nutrient efficiency and protects plant health over time.
This page is useful for soil growers, hydroponic gardeners, nursery operators, and compost tea users. It offers quick conversion, a simple workflow, export options, and a clear example table. With accurate unit handling, you can plan nutrient use more confidently and make safer gardening decisions.
It converts ammonia readings between NH3, NH4+, and nitrogen-based values. It also estimates free ammonia and ammonium shares using pH and temperature.
Free ammonia can irritate roots and harm beneficial microbes when it gets too high. The risk usually increases with warmer temperatures and higher pH.
For dilute water-based gardening solutions, ppm is commonly treated as approximately equal to mg/L. That shortcut works well for routine horticultural calculations.
They shift the balance between unionized ammonia and ammonium. Higher pH and higher temperature usually increase the free NH3 fraction.
Yes. It is useful for hydroponic reservoirs, fertigation systems, irrigation water checks, and other water-based growing setups.
No. It helps interpret measured data, but it does not replace accurate sampling, calibration, or professional laboratory testing when precision is critical.
Use the threshold that fits your crop, medium, and process. Many growers choose a conservative free NH3 target, then refine it through observation and testing.
Mass values help you understand the full ammonia load in a reservoir or planting system. That is useful for dilution planning and system management.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.