Ore Grade Calculator

Compare valuable material mass in grams with total ore mass in tonnes.

Important: This calculator is an educational estimate only. It is not mining, reserve reporting, economics, drilling, oilfield, refinery, gas handling, ventilation, confined-space, pipeline, pressure, excavation, trench, underground, construction, professional engineering, legal, regulatory, operational, emergency, or safety advice.

About the Ore Grade Calculator

This calculator expresses an entered valuable-material mass as a fraction of an entered total ore mass.

How to use it

Enter valuable material mass in grams.
Enter total ore mass in tonnes.
Calculate percentage and grams per tonne.

Formula

Grade percent = valuable grams ÷ total ore grams × 100. Grade g/t = valuable grams ÷ total tonnes.

Example

5 g in 2 tonnes gives 2.5 g/t and 0.00025%.

Notes

This arithmetic does not determine sampling quality, mineral resources, reserves, economics or recoverability and is not professional reporting advice.