Percentages & Proportions Overview
Kalc handles intuitive percentage arithmetic through a dedicated Percentage Engine with distinct AST node representations.
For full mathematical definitions, relative changes, proportional markups/discounts, and reverse percentage equations, see the Full Percentages & Proportions Guide.
Quick Reference
| Pattern | Example | Evaluates To |
|---|---|---|
| Standard Percentage | 20% of $150 | $30.00 |
| Additive Percentage | $50 + 10% or 10% on $50 | $55.00 |
| Subtractive Percentage | 40 EUR - 6% or 6% off 40 EUR | 37.60 EUR |
| Proportional Ratio | $50 as a % of $200 | 25% |
| Proportional Addition | $70 as a % on $20 | 250% |
| Proportional Subtraction | $20 as a % off $80 | 75% |
| Relative Change | $50 to $75 as % | 50% |
| Reverse Value (Of) | 5% of what is 6 EUR | 120.00 EUR |
| Reverse Value (On) | 10% on what is $110 | $100.00 |
| Reverse Value (Off) | 20% off what is $80 | $100.00 |
👉 Continue to Full Percentages & Proportions Guide