calculate_percentage_change

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Use this when you have a starting and an ending value and need the percentage increase or decrease, or a symmetric percent difference between two comparable values. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this when you need a percentage of a number (use percentage), an annualised growth rate over several years (use cagr) or an investment return (use roi). What it computes: Computes the relative change from an old value to a new value as a percentage, the signed absolute change, the new/old ratio and the symmetric percent difference. Inputs: old_value (number); new_value (number). Complete JSON argument examples: {"old_value":50,"new_value":65} | {"old_value":80,"new_value":60} Outputs: change_percent [%], absolute_change, direction, ratio, percent_difference [%]. Formula: change_percent = (new_value − old_value) / |old_value| × 100; percent_difference = |new_value − old_value| / ((|new_value| + |old_value|) / 2) × 100 Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/percentage-change with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/math/percentage-change.md