The dilution ratio 1:1000 appears frequently in pesticide labels, concentrated cleaners, and lab formulas. This guide explains what 1:1000 really means and how to calculate the right amount of concentrate and water.
What does 1:1000 dilution mean?
A 1:1000 ratio means mixing 1 part concentrate with 1000 parts water.
Total parts = 1 (concentrate) + 1000 (water) = 1001
Example:
If you’re using 10 mL of concentrate, you’ll need 10,000 mL (10L) of water to maintain a 1:1000 dilution.
How to calculate 1:1000 dilution
If you know the total volume:
Concentrate = Total volume ÷ 1001
Water = Total volume × (1000 ÷ 1001)
If you already have the water:
Concentrate = (Water volume × 1) ÷ 1000
1:1000 Dilution Table
| Total Volume | Concentrate (mL) | Water (mL) |
|---|---|---|
| 1L | 0.999 mL | 999 mL |
| 5L | 4.99 mL | 4995 mL |
| 10L | 9.99 mL | 9990 mL |
| 20L | 19.98 mL | 19980 mL |
Tip: For small concentrate amounts, use syringes or precise measuring tools.
Common use cases
- Pesticide dilution for crops or plants
- Bulk floor or equipment cleaner preparation
- Chemical or lab solutions requiring high dilution
Use an app for fast and accurate results
Manual calculations can be error-prone.
Try the “Dilution Ratio Calculator” app:
- Supports all ratios from 1:2 to 1:1000+
- Just enter your total volume and ratio
- Automatically gives concentrate and water amounts
- Built-in liter ↔ milliliter unit converter
Download here:
Summary
- 1:1000 = 1 part concentrate + 1000 parts water
- Use the formula or the app for accuracy
- Ideal for pesticides, bulk cleaners, lab chemicals