Why quotes need a buffer
Most projects take longer than the first estimate because of revisions, delays in feedback and small extra requests. If you quote exactly hours times rate, any overrun comes out of your own pay. A scope buffer adds a percentage of time to the price to cover that. The calculator shows the effect: if you quote the lean price and the work runs over by your buffer percentage, your effective hourly rate falls.
Three price tiers
The lean price is hours times rate plus direct expenses. It works for small, well-defined jobs. The standard price adds the buffer to the hours and is a safe default. The premium price lifts the standard price by a percentage. It suits rush work, higher-risk projects, or a package with extras such as more revisions or priority support.
Offering tiers can help clients choose, and it often shifts the conversation from your hourly rate to the outcome they want.
Protecting yourself
Put scope, number of revisions, timeline and payment terms in writing. A 50% deposit before work starts is common. Direct expenses such as stock assets, plugins or subcontractors should be passed through at cost or with a handling fee, and they are included in the totals here.
Protect yourself from scope creep
Scope creep is the quiet extra work that turns a profitable project into an unprofitable one. Define deliverables and the number of revision rounds in writing, and state an hourly or per-change price for anything beyond that. When a request falls outside scope, send a short quote before you start.
If you price per project, track your hours anyway. Comparing actual hours with your estimate is the best way to price the next project better.