BriefRate field guide / Scope buffer
Scope buffer calculator for freelance projects
A scope buffer is a transparent allowance for reasonable variation inside agreed work. It should protect an informed estimate—not replace a clear scope or make every future request free.
Calculate the base labour
Estimate the agreed work first, then multiply the expected hours by the working rate. Keep expenses outside the buffer calculation unless a specific expense is itself uncertain.
Choose the buffer percentage
Use a smaller percentage for repeated work with reliable inputs and a larger percentage for bounded but meaningful uncertainty. If uncertainty cannot be bounded, reduce it through discovery rather than choosing an extreme percentage.
Apply the formula
Explain what the buffer covers
Document the reason internally: coordination, input quality, technical uncertainty, or reasonable iteration inside the agreed direction. You do not need to disclose your entire internal model, but the estimate should be deliberate.
Keep changes outside the buffer
New deliverables, additional formats, extra stakeholders, new concepts, and changed direction are scope changes. Price and schedule them separately instead of silently consuming the buffer.
Make it repeatable
Put the price and the boundaries in one place.
BriefRate turns the estimate into a clear, copyable scope summary. It is a private offline tool, available once for US$9.
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