A cleaner way to plan an intraday round trip
01
Start with the market
The preset changes the currency and gives you a rule reminder. It does not lock any fee field.
02
Add every execution
Record each partial buy and sell with its own price and quantity. The tool calculates quantity-weighted averages automatically.
03
Read the full-day result
Matched quantities show the trading result; every cash flow is then rolled into the ending position's diluted cost.
One calculation model, different market constraints
The arithmetic of a matched buy and sell is universal, but settlement, same-day resale, taxes, lot sizes, and account restrictions are not. Use the market notes as prompts and confirm the details with your broker.
| Market | Currency | Editable sample fees | Trading note |
|---|---|---|---|
| CNMainland China A-shares | CNY | Buy 0.02% · Sell 0.07% · 5 fixed | A-shares generally use T+1 turnover: shares bought today cannot normally be sold today. A round trip can use previously available holdings. |
| HKHong Kong stocks | HKD | Buy 0.1127% · Sell 0.1127% · 0 fixed | Same-day buy and sell is generally possible; exchange settlement is normally T+2. Short sales require eligible securities and proper arrangements. |
| USU.S. stocks | USD | Buy 0% · Sell 0.00206% · 0 fixed | Standard settlement is T+1. Day-trading, settled-cash, and margin restrictions depend on the account and broker. |
| JPJapanese stocks | JPY | Buy 0% · Sell 0% · 0 fixed | Regular equities normally settle T+2. Lot sizes, broker fees, and same-day account handling should be checked before trading. |
| KRSouth Korean stocks | KRW | Buy 0% · Sell 0.15% · 0 fixed | Ordinary stock settlement is generally T+2. Sell-side taxes and broker commissions can vary by product and venue. |
| UKU.K. stocks | GBP | Buy 0.5% · Sell 0% · 0 fixed | Eligible U.K. share purchases can attract 0.5% SDRT. Exempt securities and upcoming tax-system changes can alter the charge. |
What the calculator includes
For each execution, the tool applies the relevant percentage rate and one fixed order charge. It then sums all buy outflows and sell inflows, and calculates weighted buy and sell prices by quantity.
Diluted position cost equals starting book cost plus all buy outflows minus all sell inflows, divided by the ending quantity. This is a planning convention; your broker's displayed tax lot or accounting cost may use a different method.
Day trade calculator FAQ
Can I enter multiple buys and sells from the same day?
Yes. Add every partial execution as a separate row. The tool calculates weighted buy and sell prices, paired quantity, estimated fees, net cash flow, ending quantity, and diluted position cost.
Are the preset fees exact?
No. They are practical starting points based on common statutory charges or example broker costs. Rounding, minimum commissions, exchange fees, account tiers, FX conversion, and exemptions can change the final amount.
Does settlement time determine whether I can day trade?
Not by itself. Exchange turnover rules, settled-cash rules, margin permissions, short-selling rules, and broker controls can all matter. A-shares generally cannot be resold on the purchase day, while other markets may allow a same-day round trip subject to account rules.
Why can average cost fall after a profitable trade?
With the same quantity held before and after the round trip, the net cash profit reduces the position's planning cost basis. A loss increases it. This does not replace your broker's tax-lot records.