Six free calculators, each answering one question a painting business has to get right to make money. No account, no card, and every one of them uses the same production-rate model that prices jobs in Surfacely.
The estimate walkthrough is a link you text a client. They walk their own place on their phone, inside and out, with photos and rough sizes, and it comes back to you ready to price.
Most painting estimates are built from a price per square metre carried in someone's head. These tools work the way a costed estimate does: measure the surface, apply a production rate for how fast that surface is painted, add prep as its own rate, then apply a margin to the cost.
That is why a narrow trim profile and a broad wall of the same area do not cost the same, and why prep on a weathered exterior is charged as hours rather than as a percentage uplift.