Advantage Calculator (Real-Time)

Peer mentor organizations frequently struggle to articulate the economic and social return on investment of their programs to funders, government partners, and prospective members. The Advantage Calculator gives individual volunteers a personalized answer to this question, but also aggregates upward: when thousands of peer mentors each see their individual impact, the platform owner can compile a credible, data-backed value story for Bufdir, grant applications, and sales prospects. For the sales website and demo booking flow, a simplified version of the calculator (pre-populated with sector averages) can function as a lead-generation tool, letting prospective organizations estimate the value their volunteer base would generate before committing to the platform. The real-time update behavior creates an engaging, discovery-oriented UX that encourages volunteers to log more activities - directly improving data completeness.

The Real-Time Impact Calculation Service runs on the backend, receiving an activity summary payload and returning a structured impact object containing metric values and the formulas used to compute them. Calculation models (hourly value rates, cost-per-professional-hour benchmarks, social value multipliers) are stored as organization-level configuration, allowing each tenant to use sector-appropriate figures without code changes. The Flutter Advantage Calculator Screen calls the service on mount and debounces re-calls when the user adjusts input sliders, using Riverpod's AsyncNotifier for state management. All numeric animations use Flutter's AnimatedSwitcher and Tween interpolation to give the impression of real-time updating without excessive API calls. The calculation logic is pure and side-effect-free, making it straightforward to unit test with snapshot assertions. The feature must degrade gracefully when the device is offline - the last computed result is cached locally and displayed with a staleness indicator rather than showing an error state.