How do you calculate solids content?

Divide dry solids mass by total sample mass and express as a percent. A 420 lb dry residue from a 1,000 lb sample is 42% solids.

What does the point gap to target mean?

It is your target percent minus the measured percent. At 42% measured against a 45% target, the gap is 3 points — the batch is 3 points lean and needs concentration or a solids add.

How do I raise solids content by 3 points?

Remove water (evaporation, filtration, or centrifuge) or add dry solids. The right route depends on the product; for coatings you usually let down less solvent, for slurries you dewater further.

What is a good solids content?

It is entirely spec-driven — high-solids coatings may target 60-80%, dewatered sludge cake 20-30%, paper coatings 60-70%. The useful question is the gap to your target, not an absolute number.

Why is my measured solids lower than expected?

Usually incomplete drying, an unrepresentative or settled sample, or added water from dilution or washdown. Re-run the dry-down to constant weight on a well-mixed sample.

Solids content vs total solids — are they the same?

Loosely yes for a single-phase sample, but total solids in wastewater includes both suspended and dissolved solids. This calculator computes the gravimetric mass fraction from the dry mass you supply.

Process Manufacturing calculator

Solids Content Calculator

Solids content is the mass fraction of non-volatile material in a sample, expressed as a percent, and it drives everything from coating film build to slurry pumpability to sludge disposal cost. Coatings chemists, wastewater operators, and paper and slurry engineers use it to confirm a batch is on spec before it moves downstream. It matters because a few points off target changes viscosity, dry-film thickness, dewatering cost, and freight paid to ship water. This calculator returns both the measured percent and the point gap to your target so you know how far to adjust.

What this calculator does

Calculate solids content from dry solids mass, total sample or batch mass, and target solids.
checking solids content against a formulation, COA, or process specification
It divides dry solids mass by total sample or batch mass to get percent solids, then subtracts that from your target to report the point gap.

Formula used

Solids content = dry solids mass ÷ total sample or batch mass
Gap to target = target solids content - solids content

Inputs explained

Dry solids mass:
Total sample or batch mass:
Target solids content:

How to use the result

Use it after a dry-down or gravimetric test to confirm percent solids and see how far a batch sits from spec.
It assumes the dry solids and total masses are measured cleanly; incomplete drying, volatile solids loss, or an unrepresentative sample will bias the result.

Current U.S. benchmarks

The producer price index for industrial chemicals stands at 344.336 (BLS, May 2026), up 16.1% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate solids content? Divide dry solids mass by total sample mass and express as a percent. A 420 lb dry residue from a 1,000 lb sample is 42% solids.
What does the point gap to target mean? It is your target percent minus the measured percent. At 42% measured against a 45% target, the gap is 3 points — the batch is 3 points lean and needs concentration or a solids add.
How do I raise solids content by 3 points? Remove water (evaporation, filtration, or centrifuge) or add dry solids. The right route depends on the product; for coatings you usually let down less solvent, for slurries you dewater further.
What is a good solids content? It is entirely spec-driven — high-solids coatings may target 60-80%, dewatered sludge cake 20-30%, paper coatings 60-70%. The useful question is the gap to your target, not an absolute number.
Why is my measured solids lower than expected? Usually incomplete drying, an unrepresentative or settled sample, or added water from dilution or washdown. Re-run the dry-down to constant weight on a well-mixed sample.

Last reviewed 2026-05-12.