You don't need a calculator for every little batch. If you're mixing a single 30ml bottle of 3mg/ml for a friend, you can do that in your head: 30 × 3 = 90mg, so 0.9ml of 100mg/ml base. But when you're mixing multiple batches with different strengths, or when you're scaling up to liters, the calculator saves you time and prevents costly errors.

For most shop owners, the simple version is enough for day-to-day operations. The advanced section is there for those moments when you're doing bulk production or custom orders. And when you're in doubt, just use the tool.