The fundraising thermometer is one of the great pieces of folk information design: a century of church roofs and charity drives compressed into a tube of rising red ink. It survives because it answers the three questions that keep a long goal alive — how full? how fast? how far to the top? — in a single glance, no reading required. This page borrows the instrument for personal goals, hand-drawn in the house ink.

One number, rising

Give the tube its top — the goal, a target, and what it's counted in: 2,000 pages. 500 kilometers. The €1,800 trip. From there the tracker is deliberately tiny: whenever progress happens, log the amount, and the ink climbs with a springy jump. At 25, 50, 75, and 100 percent, a handwritten note appears at the tick — a quarter in. halfway! the home stretch. the top.

The design has one strong opinion: measuring is its own intervention. In Harkin and colleagues' meta-analysis of 138 experiments, prompting people to monitor their progress reliably improved goal attainment — and the effect strengthened when progress was physically recorded rather than mentally noted, and when it was made visible. A thermometer is the strongest form of that: recorded, visible, and cumulative, so no single bad week can erase what the level already shows.

There's a second, quieter mechanism in the quarter marks. Goals sag in the middle — the start has novelty and the end has urgency, but the long midsection has neither. Sub-goals cut the midsection into shorter races: Locke and Latham's goal-setting work established how much specific, proximate targets outperform distant vague ones, and each tick on the tube is exactly that — a near, specific target that arrives every quarter instead of once at the end.

A ledger, not just a level

Every log lands in the ledger beside the tube — dated, amendable, removable with an arm-and-confirm tap. That matters for two reasons. Practically, numbers get mistyped and runs get double-counted; a tracker you can't correct becomes a tracker you quietly abandon. Psychologically, the ledger is the receipt trail behind the level: on the discouraged days, seven small entries reading +40, +75, +120 argue better than any pep talk that the ink got there honestly.

The right tube for the right goal

A thermometer measures accumulation, and only accumulation. If the goal is a sequence of different steps — first the draft, then the edit, then the send — that's a route, and the Goal Planner with its milestone flags is the honest shape for it. If the goal is really a daily behavior — read every night, run three times a week — consistency is the number that matters, and the Daily Habit Tracker counts it properly. And if you're not sure the goal is worded well enough to measure at all, the SMART Goals Worksheet is the sharpening stone.

Two minutes to set the top. A few seconds per log. The middle of the goal, finally visible.