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Some Calcs.com calculators and features are only available on specific plans. If a calculator tab or input is grayed out or shows a lock or upgrade prompt mid-workflow, the most likely reason is that the feature lives on a higher plan than the one you’re currently on. For example, the concrete beam design tab is part of our Pro plan, so it won’t be accessible on a lower plan.

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What you see when a feature is plan-gated

When you open a calculator or tab that isn’t included in your current plan, Calcs.com doesn’t silently fail: you’ll see an upgrade prompt or a locked-tab indicator that names the plan required to unlock it. Inputs in a gated tab are typically disabled, and any linked outputs flowing into that tab won’t compute until the plan is upgraded. If you’ve opened a project shared with you that uses calculators outside your plan, those calculators will still display their existing inputs and results in read-only form, but you won’t be able to edit them or run new analyses against them until you upgrade.