Proportion Calculator

• A ratio & proportion calculator with five modes — basic ratio, multi-value ratio, dimension scaling, percentage, and fraction — covering common aspect-ratio and scaling needs for design, photography, and video
• Results are computed instantly and can be copied in one click; common ratios (16:9, 4:3, 1:1, golden ratio) are one-tap selectable, making it easy to find aspect ratios, scaled sizes, and simplified fractions

1. Open the tool page — no installation needed
2. Pick a mode (basic ratio / multi-value ratio / dimension scaling / percentage / fraction) and set the parameters such as ratio, values, or dimensions
3. Click "Calculate" to see the result, then copy it with one click

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online proportion calculation tool, supports basic proportion calculation, multi-value ratio simplification, proportional scaling of dimensions, percentage calculation, fraction calculation. Suitable for design, photography, video production and other scenarios, helps quickly calculate aspect ratios, scaling ratios, etc.

Open the tool page — no installation needed Pick a mode (basic ratio / multi-value ratio / dimension scaling / percentage / fraction) and set the parameters such as ratio, values, or dimensions Click "Calculate" to see the result, then copy it with one click

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Proportion Calculator is completely free. No download or installation required — it runs right in your browser.