Fast, Free Industrial Measurement Calculators

Every result updates as you type — concentration & dilution, tank gauging, roll and reel, all free and instant.

Popular calculators

Calculate the dilution needed to hit a target concentration using C₁V₁ = C₂V₂.

Stock conc, target conc → diluent volume

Calculate liquid volume in cylindrical, rectangular, or capped tanks from dimensions and fill height.

Tank shape, dimensions → volume, fill %

Convert outer diameter, core diameter, and thickness into unwound length and turn count.

OD, ID, thickness → length, turns

Solution dilution, serial dilution series, and density-to-concentration lookups for NaOH, HCl, sulfuric acid, and bleach.

The dilution needed to hit a target concentration using C₁V₁ = C₂V₂.

Stock conc & volume → diluent volume

Sodium hydroxide solution strength (%w/w) from specific gravity, or the reverse.

Specific gravity or %NaOH → the other

How much bleach and water to mix for a target available-chlorine (ppm) solution.

Bleach %, target ppm → bleach & water amounts

On-site tank volume from a dimension or dip reading — including horizontal tanks with rounded heads, where fill % isn't a straight line.

Liquid volume of cylindrical, rectangular, or capped tanks from dimensions and fill height.

Shape, dimensions, fill height → volume, fill %

Solve for a cylinder's volume, radius, or height from any two known dimensions.

Any 2 of radius/height/volume → the third

Wound-roll geometry for paper, film, foil, textile, and wire — find remaining length or predict a finished roll's outer diameter.

Unwound length, turn count, and surface area from outer diameter, core diameter, and thickness.

OD, ID, thickness → length, turns, area

The outer diameter a roll will reach after winding a known length onto a core.

Core, thickness, length → outer diameter

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Every formula is derived from first principles and cross-checked against standard references — see the Sources note on each page.