How the Primer Converter Works
The Primer Converter divides primer mass by primer density. The default 1.28 kg/L fits a high-build sealing primer.
Pick the primer type
Drywall, bonding, oil-based, epoxy, shellac and zinc-rich primers differ in density.
Enter the density
Use the data sheet or the table value; zinc-rich primers exceed the 3.0 slider, so type the value.
Enter the mass
Type the primer weight in kilograms.
Read the liters
Multiply by the spread rate to plan coverage.
Primer Converter Formula
The primer formula is V = m ÷ ρprimer. Practical coverage allows for surface porosity and loss: Practical = Theoretical × (1 − Loss %).
- Loss
- Fraction lost to absorption, overspray and waste (0.2–0.4)
Worked Examples
- Drywall primer: 18 kg ÷ 1.30 = 13.85 L.
- Zinc-rich primer: 10 kg ÷ 2.70 = 3.704 L.
- Coverage on porous block: 10 m²/L × (1 − 0.35) = 6.5 m²/L.
Primer Converter Conversion Table
1 liter of drywall PVA primer weighs about 1.30 kg. The table lists 7 primer types.
| Primer Type | Density (kg/L) | lb per US gal | Liters per 1 kg | 20 kg pail (L) |
|---|---|---|---|---|
| Shellac stain-blocker | 0.950 | 7.93 | 1.053 | 21.05 |
| Bonding primer (acrylic) | 1.250 | 10.43 | 0.800 | 16.00 |
| PVA drywall primer | 1.300 | 10.85 | 0.769 | 15.38 |
| Oil-based primer | 1.350 | 11.27 | 0.741 | 14.81 |
| Epoxy primer | 1.450 | 12.10 | 0.690 | 13.79 |
| Red oxide metal primer | 1.400 | 11.68 | 0.714 | 14.29 |
| Zinc-rich primer | 2.700 | 22.53 | 0.370 | 7.41 |
What is a Primer Converter?
A Primer Converter is a calculator that converts primer weight into volume using the density of the primer type.
Primer prepares a surface for topcoats. Primers seal porous drywall, block stains, bond to glossy surfaces or stop rust on steel.
Zinc-rich primers carry 65–90% zinc dust in the dry film and weigh 2.5–3.0 kg/L. The zinc corrodes in place of the steel, a method called cathodic protection.
What are the Uses of a Primer Converter?
There are 4 main uses of a Primer Converter.
New drywall
Decorators convert pail weights into rooms primed.
Steel protection
Fabricators convert zinc primer kg into coated area.
Spray gun loading
Painters fill pressure pots by weight.
Inventory
Stores teams convert open pail weights into liters left.