The Hong Kong Dollar Peg: What 7.75 and 7.85 Mean

An American buyer needs Hong Kong dollars in six weeks. Someone says the peg makes timing irrelevant. The buyer sees quotes near 7.75 one month and near 7.85 another. For an invoice in millions of Hong Kong dollars that narrow interval still changes the required US cash.

Start with HKMA convertibility undertaking and customer bank quote. Look for whether a bank or a retail customer can use the facility. The calculation you want is the US dollar cost of an HKD obligation. A common reason for a discrepancy is fees and an executable customer spread at the edge of the band. The first worked figures below are illustrative. The historical section identifies the actual observations used and lets you change one assumption at a time.

Follow the balance sheet at each edge

At the strong side banks deliver USD to obtain Hong Kong dollars under the undertaking. The banking system’s Aggregate Balance expands through the operation. At the weak side banks obtain USD and deliver Hong Kong dollars, contracting that balance. Changes in local liquidity can affect HKD interest rates and the relative incentive to hold either currency. Adjustment need not take the form of a large spot price movement.

A USD/HKD quote of 7.8420 means the Hong Kong dollar is weaker against USD than at 7.7610. A fixed HKD 775,000 bill would require about USD 100,000 at 7.75 and USD 98,726.11 at 7.85, ignoring costs. For a US seller receiving HKD, the direction of the budget impact reverses. Write buyer or seller on the worksheet before interpreting an approach to either edge.

What a band does to a trading chart

Many observations near a boundary produce compressed-looking candles. A narrow vertical axis can enlarge small changes until they resemble a large open-market move. Check the actual distance in HKD and compare it with both sides of a customer quote. An apparent edge near the undertaking can be smaller than the spread or funding cost available to a retail account.

A currency board mechanism does not grant a retail trader unlimited access at either official endpoint. Funding rates, bid/ask quotes, settlement dates and intermediary eligibility matter. Do not price a guaranteed reversal into an account budget. A household paying tuition has a concrete currency need; a leveraged bet on a policy regime is a different decision with its own failure conditions.

When liquidity squeezes Hong Kong interbank rates

Imagine a bank needs HKD funding as the currency trades near the weak boundary. When eligible banks use the weak-side undertaking, the Authority buys HKD and sells USD. Fewer settlement balances can make HKD liquidity more valuable, all else equal. The conventional narrative is an adjustment through money-market rates. It does not establish that one specific HIBOR tenor must move on the next tick.

At the strong side the Authority sells HKD for USD to banks under the undertaking. The Aggregate Balance can expand. Across either operation it matters which side is providing the domestic currency. Use a two-column ledger headed HKD and USD from the Authority’s perspective. Write the bank’s ledger on a separate line with opposite signs. Switching perspectives halfway through a sentence is a common cause of backward explanations of the peg.

How to check the figures yourself

Write HKD per USD across the top of the sheet. A move toward 7.85 means Hong Kong dollars have weakened against USD in this notation. The HKMA buys HKD at the weak-side undertaking from eligible banks. All else equal the Aggregate Balance contracts, which can influence local interest rates.

For a US household paying tuition in Hong Kong, the institution’s transfer deadline, receiving bank fee and account currency can matter more than small interbank moves. Do not assume the wrong deadline is protected by the currency board. A bank’s retail all-in conversion can fall outside the wholesale undertaking levels.

Historical cases and a reproducible dollar comparison

To see what changes the dollar decision, take one clearly defined exposure: HKD 78,400 tuition payment. The historical column follows USD/HKD, using daily Federal Reserve exchange-rate observations distributed through FRED as DEXHKUS. The exercise uses 96 complete or selected calendar months from 2017-01 through 2024-12. The fixed research window runs from January 2017 through December 2024. Rates are publicly observed. Retail fees, contract terms and decision rules in the examples are assumptions.

Assume an executable rate granting the customer 99.7% of the market reference and a separate $18 transfer fee. Divide 78,400 by the resulting HKD per dollar rate, then add the fee. HKMA undertaking access is not assumed for the customer.

The modeled output is measured in US dollars. Its sign and units are essential when you work backward from a chart. Write the initial reference, the final reference, their dates and the modeled result in separate columns. Calculate with unrounded inputs, then round for display. A dollar-cent display may conceal small changes in the reference, especially where the model floors an outcome at zero. A tight range in the reference can make a fixed service fee comparatively important. A change in the bank’s quote spread at a holiday is a different experiment from moving the wholesale reference.

Across these months the exchange quote rose 54 times, fell 41 times and was unchanged 1 times. The median absolute endpoint change was 0.08%. The 25th and 75th percentiles of signed endpoint returns, using the sorted observation at the floor of the fractional rank on a zero-based scale, were -0.06% and 0.08%. These are descriptive sample figures. A frequency of rising quotes is neither a rate of profitable trades nor the chance of a favorable outcome on a future payment.

The largest rise | 2023-08

Start with the largest signed monthly rise in this sample. At the last observation of 2023-07, the quote was 7.79870. At 2023-08-31 it was 7.84250, a signed change of 0.56%. Applying the exposure rule to the earlier price gives 10,101.21 US dollars. Applying it to the later price gives 10,044.89 US dollars. The resulting difference is -56.31 US dollars. The quote and the modeled amount need not move in the same direction. Read the numerator and denominator of the actual contract before interpreting a rising candle as a higher bill.

For a plausible contemporaneous alternative, use the first observation of the new month, 7.79390 on 2023-08-01, as the budget anchor. The modeled change to the same ending date becomes -62.52 US dollars. You have altered only the starting timestamp. That small adjustment matters when the prior month ended before a weekend or holiday. A report that chooses the better anchor afterward mixes performance evaluation with hindsight. Use the timestamp of the actual invoice, forecast or mandate if one exists.

Separate band arithmetic from customer pricing

For HKD 82,000 due, the two wholesale boundary rates translate into USD 10,580.65 at 7.75 and USD 10,445.86 at 7.85. The dollar cost increases as HKD per dollar decreases. The difference of USD 134.79 gives the budget width between those references. There is no claim that a US customer could transact directly against either convertibility undertaking.

Translate the same payment at the observed 7.84250 and a hypothetical bank rate of 7.81113 after a 0.4% reduction in HKD delivered per dollar. The respective costs are USD 10,455.85 and USD 10,497.84. Compare this execution difference of USD 41.99 with the full band width. A relatively tight institutional exchange-rate band can coexist with a customer spread large enough to matter on this invoice.

The largest decline | 2022-11

The steepest fall among the remaining months went from 7.84980 to 7.80500. The cross rate expressed in reverse would instead move from 0.12739 to 0.12812. Its signed percentage change is 0.57%, whereas the original quote changed by -0.57%. Reversing a percentage sign is only an approximation. Arithmetic returns in reciprocal currencies have different denominators. Use full-precision quotes when translating a dollar budget in either direction.

In the working example the unchanged exposure generated a modeled 10,093.07 US dollars at the end, against an original 10,035.57 US dollars. At the arithmetic midpoint of the two observed rates the modeled result would be 10,064.24 US dollars. By comparison the mean of the two modeled endpoint amounts is 10,064.32 US dollars. A linear conversion can make these coincide; a reciprocal or an option-like floor can separate them. This is a practical unit test for a budget spreadsheet built by averaging rates before conversion.

The quietest finish | 2022-10

A quiet monthly finish concealed a sequence of 20 observations. The first budget mark and last mark differed by only 0.00% in absolute quote terms. Between them, the lowest sampled exchange rate was 7.84930 on 2022-10-27 and the highest was 7.84990 on 2022-10-03. Their ordering is observable at the daily reference frequency. It says nothing about whether a stop or limit was touched first inside an individual trading day.

Including the original budget mark, the lowest and highest modeled amounts were 10,035.44 US dollars and 10,036.21 US dollars. A payment falling due inside this interval would use the terms available on its own date. Picking the cheapest date after seeing the month grants an option the original decision maker may never have had. Ask whether the underlying agreement allowed early settlement, whether the counterparty would accept it, and what financing or fees would accompany changing the date. The end-to-end change alone leaves out all three questions.

The widest daily range | 2019-12

For the widest remaining sample range, compare the recorded low of 7.78500 with the high of 7.82890. That spread is 0.56% of the previous month-end reference. If the exposure were valued separately at those two observations, the modeled amounts would be 10,118.95 US dollars and 10,062.31 US dollars. A full intraday high-low range could be larger than this sampled range. Treat these as independent reference valuations, not executable bid and offer quotes sitting on a dealer screen at the same instant.

Now place an administrative review on the middle observation, 2019-12-16. At 7.79330 the modeled amount was 10,108.19 US dollars. The remaining change to the final observation was 5.05 US dollars. This separates currency exposure before and after the person responsible could act. It is especially useful when a headline about the full month sounds alarming but the invoice was approved or the policy decision released much later. Use an actual approval timestamp for a real case.

The busiest path | 2022-12

This month has the greatest remaining sum of absolute observation-to-observation log changes: 1.76 percentage points. Its net endpoint change in ordinary percentage terms was -0.04%. Offsetting moves can make the first number large while leaving the second small. Absolute log movement is a path statistic. It includes both directions and must never be booked as the return someone earned by holding the exposure. Collecting every move would require knowing each reversal and being able to execute it after costs.

The annualized sample standard deviation calculated from the 21 log changes was 1.83%, using 252 observations per trading year. The mean level across this month’s daily exchange marks was 7.78543, whereas its median was 7.78440. Valuing the exposure at those two central rates gives 10,118.40 US dollars and 10,119.73 US dollars. The mean answers a question about evenly weighted observations and the median is the middle observation or average middle pair. Neither is necessarily the benchmark named in a specific agreement.

A month near the middle | 2018-12

Extreme outcomes attract attention. This case was chosen for being close to the median absolute monthly move among the remaining candidates, with an absolute change of 0.08%. Its 18 daily marks give an average modeled value of 10,074.58 US dollars. Valuing the same exposure only at the last mark produces 10,060.26 US dollars. The final observation therefore differs from the typical daily valuation measured by that average by a signed -14.32 US dollars. The difference can go either way; the average has no privileged status for a one-date settlement.

Suppose a report allowed one person to choose a monthly average and another to use the last observation. They could disagree by that amount while applying identical formulas and the same published data. Settle the disagreement by identifying the decision the figure supports. A month of evenly spread expenses calls for transaction weights or a stated approximation. A single invoice calls for its conversion date. A policy announcement needs a timed quote. The right measurement rule follows from the economic event and should be fixed before examining the answer.

Separate band arithmetic from customer pricing

For HKD 730,000 due, the two wholesale boundary rates translate into USD 94,193.55 at 7.75 and USD 92,993.63 at 7.85. The dollar cost increases as HKD per dollar decreases. The difference of USD 1,199.92 gives the budget width between those references. There is no claim that a US customer could transact directly against either convertibility undertaking.

Translate the same payment at the observed 7.83050 and a hypothetical bank rate of 7.79918 after a 0.4% reduction in HKD delivered per dollar. The respective costs are USD 93,225.21 and USD 93,599.61. Compare this execution difference of USD 374.40 with the full band width. A relatively tight institutional exchange-rate band can coexist with a customer spread large enough to matter on this invoice.

A sharp single step | 2018-09

The largest remaining single-step move was from 7.84260 on 2018-09-20 to 7.80800 on 2018-09-21. In ordinary percentage terms that is -0.44%. Against the exposure rule, this step changes the modeled amount by 44.43 US dollars. Because the observations can be separated by nonbusiness days, describe this as an observation-to-observation change. The file cannot reveal which hour accounted for it or whether liquidity was available at either published level.

To check a claim about that step, identify the calendar of releases and local holidays for both currencies, then match each event with its precise published time. Look for an independent price series that actually traded in the proposed interval. A gap between daily reference marks invites a hypothesis; following the sequence of executable quotes is how you could test it. Changing an amount solely because of the two marks is an accounting exercise. Attributing the difference to a particular trader, institution or economic release needs additional evidence.

A split-date budget | 2019-06

Take the average modeled valuation on the first five available dates, 10,048.30 US dollars, and on the last five available dates, 10,086.21 US dollars. Their difference is 37.91 US dollars. This case has the largest remaining absolute gap by that definition. A plan fixed in advance to value half the exposure against each group would give a weighted amount of 10,067.25 US dollars if the exposure and its charges can be divided proportionately. The result is a comparison of timing policies. It does not reveal an optimal execution date.

A fixed charge can break that proportional assumption if two actual transactions each incur the full charge. An indivisible futures contract or option can prevent splitting the quantity at all. An announcement time cannot be averaged across ten dates. Before applying the exercise, identify the specific constraint: fees and an executable customer spread at the edge of the band. Then identify which of the two windows an actual mandate would allow. Where the timing choice is unavailable, read the two amounts as a sensitivity range instead of an executable plan.

Measure the spread against the band in comparable units

Take a quoted customer rate and a simultaneous interbank reference, both in HKD per USD. Divide the customer rate by the reference and subtract one to express the difference in percentage terms. If the bank deducts a flat transfer fee as well, compute the dollar bill separately before turning it back into an all-in rate. A small percentage reported on a wholesale chart cannot be compared directly with a dollar wire charge.

If a US business owes a fixed number of US dollars and the recipient accepts dollars, the payer has a different exposure from a business promising a fixed HKD amount. In the first case the bank may convert on the recipient side at receipt. In the second case the payer must supply enough dollars for the exact HKD delivery. Read which party bears conversion and cut-off risk. The linked exchange rate system affects the wholesale environment for both payments, but it does not choose the transfer currency for either customer.

How to identify a usable USD/HKD setup on a chart

Open a five-minute USD/HKD replay and hide everything to the right of your intended decision. This is a hypothetical long case, constructed to show how fees and an executable customer spread at the edge of the band fits into an execution record. Use New York local time for the chart, retaining the actual offset for the date. For a restricted or offshore currency, this drawing describes a price sequence, not the availability of a US retail contract. An economic reference period, a release time and a bar timestamp belong in separate fields.

In the first diagram the reference low is 7.80745. The candle that trades below it reaches 7.80694 before price returns into the range. To describe that move as a sweep in ICT terminology, mark the existing level first. If the level only becomes obvious after the reversal, save the observation as a retrospective pattern. An increase in volume or a financial headline cannot reveal whose orders traded there.

The displaced leg reaches beyond 7.80871. Read bars five, six and seven as a sequence. A gap between the outer wicks brackets the interval from 7.80832 to 7.80862. It is a chart definition of an imbalance. Price could fill that interval, pass straight through it or never revisit it. Only the first return that satisfies a rule written in advance can provide a candidate entry for this particular exercise.

How to trade the idea on demo and define failure

For the rehearsal, a buy at 7.80846 follows a return into the marked interval. If the order fails to fill, record an unfilled setup and retain the original timestamp. Moving the order toward the next favorable candle after that candle forms changes the test. Keep the macro or account question separate: The independent document check concerns fees and an executable customer spread at the edge of the band. A convincing answer about that issue cannot make a missed entry executable.

The protective exit is 7.80665, beyond the sweep, and the planned target is 7.81226. For this long idea the favorable direction in the pair is higher. A live position can experience partial fills, a spread jump or a gap past the stop. For this drawing only we assume all levels execute exactly as stated. The second chart displays one favorable sequence so that the accounting can be checked. It supplies no evidence about how often such a sequence occurs.

Set an expiry for the entry and cancel the study if the invalidation trades before entry or if the spread makes the gross plan infeasible. If a coarse chart touches stop and target within one bar, lower-frequency OHLC cannot settle the order of events. Use properly timestamped executable quotes if available. Otherwise keep a separate ambiguous sample, and state that rule before counting wins. For this rehearsal the underlying document remains the source for the US dollar cost of an HKD obligation.

Worked example in a US dollar account

Calculate the distance before calculating the money. The entry-to-stop distance is |7.80846 minus 7.80665| = 0.00181, or 18.1 pips. The target distance is |7.81226 minus 7.80846| = 0.00380, or 38.0 pips. Keeping absolute distances here avoids giving a short setup a negative risk amount. The sign of the actual result belongs on the fill record after closing.

At 12,000 base units, the distance to the stop represents 21.72 HKD and the distance to the target represents 45.60 HKD. Convert to a USD result separately at each assumed exit by dividing by 7.80665 or 7.81226 HKD per US dollar. The conversion is slightly different on the two outcomes. Gross reward divided by gross risk is USD 5.84 / USD 2.78 = 2.10. Written as risk:reward this is 1:2.10.

Assume a round-trip cost of USD 1.80 on either completed outcome. We use executable entry and exit prices, so a spread already inside those prices must not be charged again. The simplified net reward is USD 5.84 minus USD 1.80 = USD 4.04. Net planned loss is USD 2.78 plus USD 1.80 = USD 4.58. Net R:R is 1:0.88 because USD 4.04 / USD 4.58 = 0.88. Financing, slippage and tax are excluded from this short rehearsal.

Check the losing branch with the same care as the winning one. If the exit slips by one additional pip against you, the quote-currency impact on this size is 1.20 HKD before any conversion. A plan denominated in dollars should reserve for an adverse fill or skip a setup that cannot fit the intended budget. Keep the original quote and the executed price alongside the size and currency of the exposure.

To annotate the rehearsal, mark the existing swing first, then identify displacement and the interval between the outer candle wicks. For definitions and session context, see the school’s lessons on fair value gaps, order blocks, the London session, market structure shifts, and the Judas swing.

Sources and calculation notes

HKMA explanation of the linked exchange rate. HKMA history of the linked system.

Historical series and original records. DEXHKUS observations and units. The calculations use observations available when checked on November 14, 2026. Subsequent revisions can change retrospective comparisons.

Frequently asked questions

To check an exchange quote from another angle, see inverse currency quotes, broker quote differences, forex chart reading, and the trading journal.