RSI Risk Calculator

RSI in developers is caused by repetitive finger and wrist motions from prolonged typing — often 6-10 hours per day. Contributing factors include poor desk ergonomics, non-ergonomic keyboards, lack of breaks, sustained mouse use, and awkward wrist angles. The cumulative strain from thousands of daily keystrokes damages tendons, nerves, and surrounding tissue over time.

Research suggests that exceeding 10,000 keystrokes per hour significantly raises RSI risk. A typical developer typing 6-8 hours daily accumulates 30,000-40,000 keystrokes per day, or over 8 million per year. While there is no universal safe threshold, reducing total keystrokes through voice typing, keyboard shortcuts, and regular breaks meaningfully lowers your risk.

Voice typing is one of the most effective ways to reduce RSI risk because it eliminates keystrokes entirely for dictated text. By using voice-to-text for emails, messages, documentation, and code comments, developers can cut their daily keystrokes by 50-60%. This gives overworked tendons and joints time to recover while actually increasing writing speed.

Early RSI signs include tingling or numbness in the fingers (especially at night), aching in the wrists or forearms after typing sessions, stiffness in the hands when waking up, reduced grip strength, and a dull pain that fades during breaks but returns when typing. If you notice any of these, take action early — RSI is much easier to prevent than to treat once it becomes chronic.