Ratio & Proportion Calculator
Solve for x, simplify, split amounts
Solve a Proportion (leave one box empty)
:=:
Leave exactly one of the four boxes empty. Solved by cross-multiplication.
Simplify a Ratio
:
Split an Amount by Ratio
Common Screen & Photo Ratios
| Ratio | Typical resolutions | Used for |
|---|---|---|
| 16:9 | 1920×1080 · 2560×1440 · 3840×2160(4K) | Monitors · TV · YouTube |
| 4:3 | 1024×768 · 1600×1200 | Older monitors · iPad |
| 3:2 | 3000×2000 · 6000×4000 | Camera photos (FF/APS-C) |
| 21:9 | 2560×1080 · 3440×1440 | Ultrawide |
| 1:1 | 1080×1080 | Instagram square |
| 9:16 | 1080×1920 | Shorts · Reels · Stories |
FAQ
How do I solve for x in a proportion?
Use cross-multiplication: if 2:3 = 4:x then 2x = 12, so x = 6. Leave the unknown box empty above and it solves automatically.
How do I turn a ratio into percentages?
Divide each part by the total of the parts: 3:2 → 3/5 = 60%% and 2/5 = 40%%. The simplifier shows this alongside the reduced ratio.
What resolutions are 16:9?
1280×720 (HD), 1920×1080 (FHD), 2560×1440 (QHD) and 3840×2160 (4K). See the chart below for other aspect ratios.
How do I split $100 in a 3:2 ratio?
Divide by the sum of parts (5) to get a $20 unit, then multiply: $60 and $40. The split tool does this for any ratio.
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