Price change calculator: earlier and closing price
Measure a later quote against an earlier quote for exactly the same contract and outcome.
Enter a scenario
Use one currency and unit throughout. Every field is required; no market or personal financial data is loaded.
Scenario result
Fill in every field and the result appears here as you type. An empty field is missing information, not zero.
Sources and scope
Checked November 5, 2026.
Price change calculator: earlier and closing price uses the formulas shown above and assesses no personal financial circumstances.
Compare an earlier price with the closing price
The price change calculator subtracts the supplied earlier price from the later price, then multiplies that difference by the entered quantity. The two prices must describe the same contract, outcome, currency and quote type. A price for a later edition of an event is a different observation, not its closing value.
Hypothetical example: an earlier price of 0.40, closing price of 0.46 and quantity of ten give a difference of 0.06 per unit and 0.60 across the quantity. The calculation does not establish a sale at 0.46, deduct transaction fees or describe the contract’s final settlement. Keep that distinction beside the result.
Use source timestamps to explain what closing means in the series you supply. A last transaction, bid and ask can differ at the same moment. The model does not show that an earlier decision was correct, reveal the cause of a change or measure the cash actually received from an account.