Why Does the Exchange Rate Change Every Day? Understanding the Rupee and the Dollar

You check the rate on Monday and one dollar costs a certain number of rupees. You check again on Thursday and it has moved. Not by much, usually, but it is never quite the same twice. For anyone buying foreign currency for a trip or sending money abroad, this can be unsettling, because the number you planned around keeps shifting. The movement is not random, though. It follows a handful of forces that push on the rupee every single day.

Here is the short version. The exchange rate changes every day because a currency is a price, and like any price it moves with demand and supply. The rupee's value against the dollar depends mostly on how many dollars India needs versus how many are coming in. When India has to buy more dollars, to pay for oil imports for example, or when foreign investors pull money out, the rupee weakens. When dollars flow in, it strengthens. Oil prices, foreign investment, the strength of the US dollar and the Reserve Bank of India all push on that balance daily, which is why the rate you saw yesterday is rarely the rate today.

What an exchange rate actually is

An exchange rate is simply the price of one currency measured in another. When the rate is, say, 95, it means one US dollar costs 95 rupees. Nothing more complicated than that.

Two words come up constantly, and they are worth pinning down. When the rupee weakens, or depreciates, it means you need more rupees to buy one dollar. When it strengthens, or appreciates, you need fewer. A rupee that moves from 95 to 96 against the dollar has weakened, because a dollar now costs more rupees than before.

Like the price of anything, an exchange rate is set by demand and supply. The rupee's daily value is really a question of how much demand there is for dollars in India against how many dollars are available. Everything that follows is just a reason that balance tips one way or the other.

What moves the rupee against the dollar

A handful of forces tip the balance between demand for dollars and the supply coming in, and they are worth knowing by name. The biggest are the price of oil, the flow of foreign investment, the strength of the US dollar itself, and the actions of the Reserve Bank of India. Each one pushes on the same demand-and-supply balance, and the rate you see at any moment is the running result. The sections below take them one at a time.

Oil is the biggest single force

India buys most of its oil from other countries, around 85% of what it uses, and it pays for that oil in US dollars. This makes the rupee unusually sensitive to the price of crude.

When oil gets more expensive, India needs even more dollars to buy the same amount of it. That extra demand for dollars pushes the rupee down. The link is direct and mechanical, and it is often the loudest force in the room.

Early 2026 showed this plainly. Tensions in West Asia sent the price of crude oil from below 70 dollars a barrel to above 110 in a matter of weeks. India's oil companies had to buy billions of dollars every month to pay for imports, and that wave of dollar buying drove the rupee to record lows. Nothing about India's economy had changed overnight. The price of oil had, and the rupee followed.

Foreign investment, interest rates and inflation

Foreign investors put large sums into Indian shares and bonds. When they invest, they bring dollars into India and convert them to rupees, which supports the rupee. When they sell up and take their money home, they buy dollars to leave, which weakens it. These flows can be huge, and they can reverse quickly.

Interest rates sit behind a lot of this movement, because money tends to flow towards wherever it earns more. When interest rates in the US rise relative to India, some investment moves out of India to chase the better return abroad, taking dollars with it and pressuring the rupee. When the gap narrows the other way, the pull eases.

Inflation works on a slower fuse. If prices in India rise faster than prices abroad, the rupee tends to lose value over time, because the same rupee buys less than it used to. This is a gradual drift underneath the daily moves rather than a force you see on any single day. And when global investors turn cautious for any reason, whether a war or a US rate move, they often pull money out of markets like India and move it to the safety of the dollar, which the rupee feels at once.

The strength of the US dollar itself

Sometimes the rupee is not really weakening at all. The dollar is strengthening against everything.

The US dollar has its own value that rises and falls against all currencies together, driven by what is happening in the American economy. When the dollar is strong worldwide, the rupee falls against it even if nothing has changed in India, simply because it takes more of every currency, the rupee included, to buy one dollar. It helps to remember that an exchange rate is a relationship between two currencies, so either side can move it.

What the Reserve Bank of India does

A common belief is that the RBI sets the rupee's value, or defends a particular number. It does neither.

India lets the rupee float, which means the market decides its value day to day. What the RBI does is smooth the ride. When the rupee is falling sharply, it sells dollars from its foreign exchange reserves to add supply and slow the fall. When the rupee is rising fast, it can buy dollars instead. The aim is to prevent violent swings, not to hold the rupee at a fixed level.

This is why, even in a difficult stretch like early 2026, the rupee weakened gradually rather than collapsing. The RBI drew on its large reserves to take the sharpest edges off the move. It can soften the pace of a change, but it cannot reverse the underlying forces of demand and supply, and it does not try to.

What can make the rupee stronger

Everything so far explains why the rupee falls, but the same forces work in reverse, and it is worth seeing both directions.

When oil prices ease, India needs fewer dollars to buy the same imports, which takes pressure off the rupee. When foreign investors put money into Indian shares and bonds, they bring dollars in and lift it. And a steady stream of dollars arrives every day from India's software exports and from Indians working abroad sending money home, which quietly supports the rupee in the background. When these inflows outweigh the demand for dollars, the rupee strengthens.

Why the rate you saw yesterday is already gone

Currency markets do not close at the end of the day the way a shop does. They trade continuously, across time zones, somewhere in the world, almost around the clock.

That means all of these forces are being priced in constantly, even while you sleep. By the time you check the rate the next morning, the balance of demand and supply has already shifted, sometimes by a little, occasionally by a lot. The rate is less a fixed number than a live reading that never quite stands still.

How much does the rate actually move

On an ordinary day, the rupee moves only a little against the dollar, often a fraction of a percent, somewhere from a few paise to a few tens of paise. On a small transaction you would barely notice it.

The large moves that make the news, like the slide during the 2026 oil shock, build up over weeks and months rather than landing in a single day. So for most people planning a trip or a fee payment a few weeks out, the day-to-day movement is small enough that it rarely changes the picture much.

Should you buy now or wait

This is the question the moving rate plants in everyone's mind, and the honest answer is that for a near-term need, waiting is rarely worth it. Nobody can reliably predict which way the rate will go next, and over a few weeks the movement is usually small. Waiting exposes you to an adverse move just as easily as a favourable one, so it is closer to a gamble than a saving.

What you can control is more useful than what you cannot. The rate is only locked when your transaction is done, not when you first check it. And many providers quote a rate that already has a markup of 2 to 5% built into it, a cost entirely separate from the market's own movement and one you can avoid.

Matrix Forex quotes the live interbank rate, the real market rate at that moment, with no markup added and a visible timestamp showing when it was last updated. So securing a fair, markup-free rate when you are ready beats trying to time a market that even professionals get wrong.

Frequently asked questions

Why does the rupee keep falling against the dollar

The rupee falls when demand for dollars in India outweighs the supply coming in. The main causes are a high oil import bill, since India buys most of its oil in dollars, foreign investors moving money out, and a globally strong US dollar. When these forces ease, the rupee can recover some ground.

What makes the exchange rate go up and down

An exchange rate is the price of one currency in another, set by demand and supply. For the rupee against the dollar, the key forces are oil prices, foreign investment flows, the strength of the US dollar, interest rate differences, and intervention by the Reserve Bank of India to smooth sharp moves.

Does the RBI control the rupee's value

No. India lets the rupee float, so the market sets its value. The RBI steps in only to smooth large swings, selling dollars from its reserves to slow a sharp fall or buying them to slow a rapid rise. It does not fix the rupee at a set level or defend a particular number.

Why is the exchange rate different every time I check

Currency markets trade around the clock across the world's time zones, so the rate updates constantly as new information is priced in. Even overnight, the forces that move the rupee keep working, so the rate you see in the morning has usually shifted from the day before.

How do oil prices affect the rupee

India imports around 85% of its oil and pays in US dollars, so a rise in crude prices means India needs more dollars to buy the same oil. That extra demand for dollars pushes the rupee down, which is why a spike in oil often weakens the rupee quickly.

Should I buy forex now or wait for a better rate

For a near-term need, waiting is rarely worth it. Day-to-day moves are usually small, nobody can reliably predict the direction, and waiting risks an adverse move as much as a favourable one. Securing a fair rate with no markup when you are ready is more practical than trying to time the market.

The exchange rate moving every day can feel like instability, but it is just a price doing what prices do, responding to a world that never stops changing. You do not need to predict it. Understanding what drives it, and securing a fair rate without a markup when the time comes to buy or send money, is all most people need. Visit matrixforex.in to see the live interbank rate and order forex at the real market rate.