いか

いか attaches to a number or quantity to mean that the amount is not higher than that value. It is a concise, slightly formal way to set a maximum limit. It is commonly used in budgets, fees, capacities, and deadlines when giving instructions or conditions. It does not describe degree or comparison beyond a fixed ceiling, unlike ~より (than) or ~くらい (about). Use in written forms, forms, notices, and official-sounding contexts.