i What this calculator does
This calculator works out the percentage gain or loss between any two values, whether for a trade, an investment, or any other financial comparison.
Enter your starting and ending values, and the calculator returns the percentage change and absolute difference, a foundational concept covered in our guide on maximum drawdown.
This calculator is for educational purposes only. Not financial advice.
How to use the Percentage Gain/Loss Calculator
Every field starts with a sensible default, so a result appears before you change anything at all.
- 1. Starting Value
- 2. Ending Value
The result panel reports:
- Starting Value
- Ending Value
Alongside the headline figures, the calculator reports starting value, ending value, percentage change, absolute difference. Those are the numbers that usually explain why the headline result came out where it did.
The method is visible: the steps sit directly below the result.
One caution worth stating. A calculator answers exactly the question you pose to it, and the quality of the answer is set entirely by the inputs. Figures taken from a single period, an optimistic forecast, or a sample too small to be meaningful will produce a precise number that is not a reliable one. Where the result will inform a real decision, run it at several plausible inputs and treat the spread as the answer rather than any single figure.
The same applies to comparisons. A figure is informative against a benchmark, a sector average or the same measure over the company's own history, and much less so on its own. That context is what turns a number into a judgement.
Write down the assumptions with the answer. A result without its inputs is impossible to revisit, and revisiting is usually where the value is.
See also: Average Entry Price Calculator.
Frequently asked questions
What's the difference between percentage gain and percentage points?
Percentage gain measures relative change from the original value, going from R100 to R150 is a 50% gain, percentage points measure absolute difference between two percentages, the distinction matters and is a common source of confusion, especially in financial reporting.
Does this calculator work for both gains and losses?
Yes, if your ending value is higher than your starting value, the result shows as a positive percentage gain, if lower, it shows as a negative percentage loss, the same formula handles both directions automatically.
Why does a 50% loss require more than a 50% gain to recover?
Because percentage changes are relative to a shifting base, losing 50% of R100 leaves R50, but gaining back to R100 from R50 requires a 100% gain, not 50%, this asymmetry is a fundamental, often underappreciated aspect of percentage-based returns.
Can I use this for currency values, not just Rand?
Yes, the calculation is currency-agnostic, simply enter your starting and ending values in whatever currency or units you're working with, the percentage result will be accurate regardless of the specific currency involved.
Is this the same calculation used for investment returns generally?
Yes, this is the standard percentage return formula used broadly across finance, for annualised returns over multiple years accounting for compounding, use our dedicated CAGR Calculator instead.
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