Developer freelancers almost always estimate based on the happy path. The happy path: everything works first time, the client knows exactly what they want, no third-party APIs behave unexpectedly, and feedback comes back within a day. Real projects do not look like the happy path. A simple adjustment: after estimating the happy path, apply a multiplier. 1.3x for well-defined projects with clear specs. 1.6x for projects with some ambiguity. 2.0x for significant unknowns. 2.5x for legacy codebases or complex integrations. This feels too high the first time you use it. After a few projects, it starts to feel accurate.

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