Keep a 10-Inch Offcut of Base Stock as a Measuring Block, Square, and Notepad

The Problem

Measuring into a corner with a tape means bending the tape into the joint and guessing where the hook actually sits — the classic source of baseboard pieces an eighth short or an eighth proud. And on a trim day, the pencil, the notepad, and the square are never in the same place as your hands.

The Technique

Cut a strip of the base stock you're installing to exactly 10 inches and keep it with you:

1. Corner measuring block. Instead of bending the tape into the corner, stand the block in the corner and measure to its edge. Add the block's 10 inches — a round number picked so the math never trips you — and you have a true inside measurement with no tape-bend guesswork.
2. Square-check reference. Hold the block against a cut end before installing the piece — because it's the same stock, it shows immediately whether the cut will sit square against the adjoining piece.
3. Notepad. Measurements get written right on the block's face. It's always in your hand when you're at the saw, and it doesn't wander off the way paper does.