Bearing Grease Calculator
How much grease to add at each relube, based on bearing size, and how heat changes how often.
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Formula: G = 0.005 × D × B (mm → grams), or 0.114 × D × B (inches → ounces). Heat factor: interval halves for about every 15 °C above 70 °C. Rules of thumb only; always follow the bearing and equipment maker.
Which grease? See the electric motor lubrication map →How much grease should I put in a bearing?
A common rule for each relube is G = 0.005 × D × B, where G is grease in grams and D (outside diameter) and B (width) are in millimeters. In inches the result is in ounces: G = 0.114 × D × B.
Why does temperature shorten the relube interval?
Grease oxidizes faster as it gets hotter. A widely used rule of thumb halves the relube interval for about every 15 °C (27 °F) above 70 °C (158 °F).
Can I over-grease a bearing?
Yes. Too much grease churns, heats up and can push past seals. Add grease slowly while the bearing runs, if safe, and stop when you feel resistance or see purge at the relief.
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