The weight capacity of oak shelves depends on the thickness and number of brackets used. Here's a simple guide:
For 15-32 mm thick shelves:
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2 brackets (up to 60 cm long): Holds about 9-13 kg.
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3 brackets (60-120 cm long): Holds about 22-27 kg.
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4 brackets (over 120 cm long): Holds up to 34 kg.
For thicker shelves (44 mm or more): Hold up to 45 kg with strong brackets.
For heavier items, use more brackets or stronger anchors and always fix to a solid wall or timber studs.