Instruments
Every number I bring to a decision, worked out in the open.
The calculators and the workspace I use in real decisions: sizing an opportunity, planning a study, defending a budget. Each one shows its formula and what it cannot tell you.
- Funnel impact A year of revenue per point, step by step. Open the calculator
- A/B test planner Sample size, runtime, and whether to read it yet. Open the calculator
- Design system ROI A payback month and the figure the case rests on. Open the calculator
- Survey sample size What your result can and cannot tell apart. Open the calculator
- UX metric scorer The interval around the score, and what it rules out. Open the calculator
- Usability test planner What share of problems your sample will find. Open the calculator
- Research ROI The risk cut a study has to deliver to pay. Open the calculator
- Prioritization scorer The order to build in, and what yours costs. Open the calculator