Absolute Change Calculator |a − b|. a b Absolute change 15 Step-by-step with your numbers: 1. Values used: 2. a = 100 3. b = 85 4. Absolute change = a - b = 100 - 85 = 15 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! |a − b| — the raw difference. FAQ Relative? Divide by |original| for relative change. Related calculators Absolute Value Calculator Find the absolute value (distance from zero). Percentage Change Calculator Find the percent increase or decrease between two values. Relative Change Calculator Relative difference formula.