Ratio, Proportion & Percentage Solver

The solver covers nine workflows: ratio simplification (with equivalent ratio generation), a:b=c:d proportions, part–whole–percent conversions, direct and inverse proportion, ratio splitting with optional integer rounding, percent change and reverse percent, percent comparisons highlighting percentage points versus relative change, and map scale conversions.

Teacher mode keeps the worked steps visible for projection or screenshots, LaTeX export supports formal notes, and the share button copies a URL with all inputs so students can revisit exactly the same example.

Start with the minimum required inputs shown above the calculate button, then keep optional settings at their defaults for a first run. After you get a baseline result, change one parameter at a time so you can see exactly what caused the output to move.

The calculator keeps internal precision and rounds only for display. Small differences can still appear when another tool uses different constants, unit assumptions, or rounding rules. Match the same assumptions before comparing values.

Different tools often choose different conventions, default rates, or date-count methods. Check units, period settings, and any hidden defaults first. If your setup matches and values still differ, use the worked example and steps section to identify the branch where methods diverge.