PPB to PPT Calculator
PPB is already small, but some analyses — dioxins, PFAS, certain pesticides — live one scale finer. Multiplying PPB by 1,000 gives you PPT, the unit those reports actually use.
Calculator
PPB to PPT Calculator
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PPB is already small, but some analyses — dioxins, PFAS, certain pesticides — live one scale finer. Multiplying PPB by 1,000 gives you PPT, the unit those reports actually use.
How to use this calculator
- Enter the concentration in PPB.
- Multiply by 1,000.
- Read the result in PPT.
- Keep the basis unchanged.
The formula
A billion goes into a trillion one thousand times, so 1 PPB = 1,000 PPT. One multiplication, no assumptions.
What the units mean
PPB (parts per billion) — one part per billion parts. The standard unit for trace contaminants in drinking water and environmental samples.
PPT (parts per trillion) — one part per trillion parts. Used for ultra-trace analysis where PPM values would be unreadably small, such as dioxins, PFAS, or pharmaceutical impurities.
Worked example
A soil sample shows 2.5 PPB of a contaminant. In PPT: 2.5 × 1,000 = 2,500 PPT — directly comparable to the 1,000 PPT screening level.
Quick reference
| PPB | PPT |
|---|---|
| 0.1 | 100 |
| 1 | 1,000 |
| 2.5 | 2,500 |
| 10 | 10,000 |
| 100 | 100,000 |
Multiply by 1,000 — the basis does not change.
Where you will actually use this
Environmental labs and regulatory filings for persistent pollutants routinely report in PPT. This bridges your PPB data to their world.
- PFAS and dioxin reporting
- Pesticide residue analysis
- Regulatory filings
- Comparing lab PPB data with PPT limits
Mistakes that give wrong answers
- Using 1,000,000 instead of 1,000
- Reading "ppt" as parts per thousand in old documents
Key takeaways
- Formula: PPT = PPB × 1,000
- Remember: Multiply by 1,000 — the basis does not change.
- Watch out for: Using 1,000,000 instead of 1,000
- Next step: run your own numbers in the calculator above, then verify with a measurement — calculated values are only as good as the inputs.
Frequently asked questions
How do you convert PPB to PPT?
Multiply PPB by 1,000.
How many PPT are in 1 PPB?
1,000 PPT.
What is 0.5 PPB in PPT?
500 PPT.
Do I need density for this?
No — same-basis scale conversion.