⚖ Ratio & proportion percentage calculators

Written by Rohan Mehta Updated
Editorial details Reviewed by Vikram Sen Verified · Methodology · Accuracy policy

Quick answer

Market share, equity splits, ratio-to-percent, and proportional allocation when parts must sum to a whole.

Share %: (part / whole) × 100 · Ratio a:b as % of whole: (a / (a+b)) × 100 for two-part splits · Weighted split: (weightᵢ / Σweights) × total

Best for: Cap tables, market share slides, survey breakdowns, bill splitting.

Also see: Marketing hub · Conversions · Percentage guide

Express parts of a whole as percents—confirm every part sums to the total you define before sharing cap-table or market-share slides.

Key facts

Part-to-whole Part ÷ total × 100 after parts sum to the defined whole.
Category Business / mathematics
Related concepts Percent of total, ratio normalization, weighted splits.

Definitions

Market share

Firm sales ÷ market sales × 100 for the period and geography you define.

Proportional split

Allocate a total by relative weights that sum to 100% of the allocation basis.

Comparison table

Topic Guidance
Share vs growth Share is part-to-whole; growth is time-series change—use the change cluster for deltas.
Ratio vs fraction Normalize multi-part ratios to a common total before converting to percent.

❓ Frequently Asked Questions

Can parts exceed 100% combined?

Only if your definition allows overlap; otherwise weights should sum to the whole you declare.

Where is cap-table dilution?

Start with equity split; confirm pre/post money definitions with legal counsel.

Glossary references

Pair percent language with conversion pages when you mix fractions, decimals, and ratios.