Free tools for bulk materials and rail

Calculators and generators we built for the people who measure piles and move railcars. Free, no signup, and everything runs in your browser.

An amber caliper measuring a conical stockpile overlaid with a glowing measurement mesh, beside a stack of shipping documents and a rail hopper car. Free measurement tools for bulk materials

Stockpile Volume Calculator

Volume, tonnage, and truckloads for conical piles, windrows, and bunkers, with material density built in.

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Grain Bin Volume Calculator

Capacity of a round grain bin or silo in bushels, tons, and cubic feet, for level, peaked, and hopper-bottom fills.

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Cubic Yards ↔ Tons Converter

Convert volume to weight (and back) for 18 bulk materials, plus a full density and angle-of-repose chart.

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Gravel & Material Calculator

How much gravel, stone, sand, or soil an area needs, in cubic yards, tons, and dollars.

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Bill of Lading Generator

Create and print a clean straight BOL in your browser. Nothing uploaded, nothing stored.

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Rail Demurrage Calculator

Estimate demurrage exposure per car, per event, and per year from days held, free time, and tariff rate.

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GSD Calculator

Ground sample distance for drone mapping flights: camera, altitude, cm/px, and image footprint.

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Bulk Density Chart

Loose densities and angles of repose for 18 materials, in lb/yd³, tons/yd³, and kg/m³.

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Rebulk Blueprint

Model your shed or yard in 3D and see how many sensors full coverage takes: placements, coverage percentage, and a printable plan.

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These tools estimate. Rebulk measures.

When the numbers feed a balance sheet, estimates stop being enough. Rebulk measures actual inventory with phone scans, drone capture, and fixed sensors, all in one system.

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