Percentage & Trace Calculator

1Basic Parameters

Solute Mass g

Solvent Mass g

Solution Mass g

Fill Basics

Enter mass first

→

Or Concentrations

Enter % or ppm

→

Auto Linkage

All fields auto-fill

2Concentrations

Mass % (w/w) %

Parts per million ppm

Parts per billion ppb

v/v w/v g/mL

v/v / w/v / density

Solute Volume mL

Solution Volume mL

Density g/mL

Volume % (v/v) %

Mass/Vol % (w/v) %

Dilution

Dilution Helper

Solve one missing value for same-basis dilution.

C1 x V1 = C2 x V2

Dilution Basis

Enter any 3 values in the same basis.

Stock Conc. (C1)

Stock Vol. (V1) mL / L

Target Conc. (C2)

Final Vol. (V2) mL / L

Enter any 3 values in the same basis.

Calculation Results

Calculation Formulas

Mass % (w/w)

m_solute

m_total

× 100%

Mass/Vol % (w/v)

m_solute (g)

v_total (mL)

× 100%

Density (d): Mass per unit volume (g/mL). m = v x d
ppm (Parts per million): 1 mg of solute per 1 kg (or 1 L) of solution.

Calculation Steps

Enter two linked values
Start with any reliable pair such as solute mass plus solution mass, or wt% plus ppm.
Unlock advanced mode when needed
Open the volume and density panel only when you need v/v, w/v, mL, or g/mL conversions.
Cross-check the auto-filled outputs
Review the linked percentages and trace-unit values to confirm they match your lab assumptions.

Scientific Knowledge Base

Mass vs Volume %

w/w is independent of temperature. w/v and v/v change with temp as volume expands.

ppm

Trace Elements (ppm)

1 ppm = 1 mg/kg. For water (d about 1 g/mL), 1 ppm is approximately 1 mg/L.

Why density matters

Density bridges gravimetric recipes and volumetric preparation, especially when the solution is not water-like.

lab

Common lab use cases

Food, pharma, and environmental workflows often move between percent concentration and ppm or ppb reporting.

Calculation Panel