How the Isopropyl Alcohol Converter Works
The Isopropyl Alcohol Converter divides isopropyl alcohol (IPA) mass by density at its water content. The default 0.786 kg/L fits 99% IPA at 20°C (68°F).
Read the strength
Check the label: 99%, 91% or 70% IPA by volume.
Pick the density
Read the density for that strength from the table.
Enter the mass
Type the IPA weight in kilograms.
Read the liters
Use the volume for wipes, cleaning and dilution.
Isopropyl Alcohol Converter Formula
The IPA formula is V = m ÷ ρ(%). Water raises the density, so 70% rubbing alcohol is about 12% heavier per liter than 99% IPA.
- Cfinal
- Target IPA strength, % v/v
Worked Examples
- 99% IPA: 5 kg ÷ 0.786 = 6.361 L.
- 70% rubbing alcohol: 5 kg ÷ 0.877 = 5.701 L.
- Dilution: 1 L of 99% IPA makes 99 ÷ 70 = 1.414 L of about 70% IPA.
Isopropyl Alcohol Converter Conversion Table
99% isopropyl alcohol weighs 0.786 kg/L, while 70% IPA weighs about 0.877 kg/L at 20°C. The table lists 5 common strengths.
| Strength (% v/v) | Density (kg/L) | Liters per 1 kg | 1 US qt (kg) | 16 fl oz bottle (g) |
|---|---|---|---|---|
| 99.9% (electronics grade) | 0.786 | 1.272 | 0.744 | 372 |
| 99% | 0.787 | 1.271 | 0.745 | 372 |
| 91% | 0.818 | 1.222 | 0.774 | 387 |
| 70% (rubbing alcohol) | 0.877 | 1.140 | 0.830 | 415 |
| 50% | 0.930 | 1.075 | 0.880 | 440 |
What is an Isopropyl Alcohol Converter?
An Isopropyl Alcohol Converter is a calculator that converts IPA weight into volume using density at the alcohol strength.
Isopropyl alcohol (2-propanol, C₃H₈O) cleans electronics, disinfects skin and dissolves flux. 99% IPA dries fast without residue on circuit boards.
70% IPA kills microbes better than 99% IPA. The water slows evaporation and helps the alcohol denature proteins inside the cell.
What are the Uses of an Isopropyl Alcohol Converter?
There are 4 main uses of an Isopropyl Alcohol Converter.
Electronics cleaning
Repair shops convert drum weights into bottle fills.
Healthcare disinfection
Clinics dilute 99% IPA to 70% by volume.
3D printing
Resin printer users convert IPA wash tank fills.
Lab inventory
Labs convert IPA stock weights into liters.