Solve proportions a/b = c/d for the fourth term — recipes, maps, dosages scale correctly. Double a 4-serving recipe to 10 without breaking ratios — free, runs locally.
Content reviewed October 2026 · About Toolzum
Compute semester GPA from course grades and credit hours with credit-weighted math on the standard 4.0 scale — quick academic snapshot. See what straight B's earn — free, local, no signup.
Convert a single course percentage into its letter grade on the built-in plus/minus scale — see that an 85 earns a B instantly. Free, local, no signup.
Add, subtract, multiply, and divide fractions with simplification and decimal equivalents. Split 3/4 of a bill three ways without decimal drift — free, runs locally.
Format TSX React components with type-aware indentation — TypeScript types plus JSX markup, both handled correctly without breaking either side.
Compute next semantic versions from change types — breaking bumps major automatically. Tag v2.4.1 correctly after that breaking fix — local logic, free, no signup.
Set servings over ingredients with the unknown last: A=4, B=500g flour, C=10 gives D = (500 × 10) ÷ 4 = 1250g. The tool cross-multiplies for the fourth term — scaling that never breaks the taste balance.
For a/b = c/d, a×d equals b×c — the tool solves that equation for the fourth term D only. Rearrange by hand first if a different term is the unknown.
Yes — 30% is the ratio 30/100. Put the unknown last: A=100, B=450, C=30 gives D = (450 × 30) ÷ 100 = 135.
No — solving runs locally in your browser. Numbers never leave your device.