What this calculator does
This calculator converts an amount using an exchange rate you type in yourself, then adds a safety markup on top. Nothing is fetched from the internet — that is deliberate. You control the rate, so the result reflects the rate you can actually get from your bank or card, not an interbank figure nobody trades at.
How to use it
- Enter the amount in the currency you are converting from — usually your supplier's currency.
- Enter the exchange rate you actually receive. Check your bank or payment provider, not a search engine's mid-market rate.
- Enter a safety markup to cover spread and rate movement between now and when you pay.
- Read the converted figure. That is the number to use as your cost when pricing.
- Compare the effective rate shown against the raw rate to see what your buffer really costs.
The formula, explained
The markup is not a fee you pay to anyone. It is a cushion you build into your own cost assumption so that a two percent move in the exchange rate does not silently remove two percent from your margin.
Rates move constantly, and the rate you see quoted is almost never the rate you get. Banks and card networks add a spread of anywhere from half a percent to four percent. Building that in up front is far easier than repricing a catalogue every time a currency wobbles.
A worked example
A supplier invoice is 100 in one currency and today's rate is 278.50. The raw conversion is 27,850.
Add a 3.5% safety markup and the figure becomes 28,824.75, at an effective rate of 288.25. Price your product against that higher number and a modest rate move costs you nothing. If the rate holds, the buffer simply becomes extra margin — which is a far better outcome than discovering your landed cost rose after you set the price.
| Amount | 100.00 |
|---|---|
| Exchange rate | 278.50 |
| Raw conversion | 27,850.00 |
| Safety markup | 3.5% |
| Converted with buffer | 28,824.75 |
What a good result looks like
How large a buffer you need depends on how volatile the pair is and how long your payment cycle runs.
| Range | What it means |
|---|---|
| 1% to 2% | Stable major pairs with immediate payment. |
| 3% to 5% | The common working range, covering typical card and bank spread. |
| 5% to 8% | Volatile currencies or long gaps between pricing and paying. |
| Above 8% | Consider hedging or paying in your own currency instead. |
Common mistakes
- Using the mid-market rate. The rate shown in search results is the interbank rate. Nobody at retail gets it. Always use the rate your provider actually applies.
- Forgetting the card conversion fee. Many cards add one to three percent on foreign transactions on top of an already marked-up rate. Check a real statement rather than assuming.
- Repricing on every small move. Constant price changes confuse customers and break ad campaigns. A sensible buffer removes the need to react to noise.
- Ignoring the direction of risk. If your costs are in a strengthening currency and your revenue in a weakening one, margin erodes quietly. Review the assumption quarterly.
- Applying one rate to a whole year. A rate typed in six months ago is not today's rate. Update the figure whenever you review pricing.
Frequently asked questions
Why does this calculator not fetch live exchange rates?
Because a live rate would be the mid-market rate, which is not the rate you pay. Your bank or card adds a spread, and that spread is the whole point of the exercise. Typing in the rate you actually receive produces a far more useful number, and it keeps the tool working with no internet connection at all.
What markup should I add to an exchange rate?
Three to five percent covers typical bank spread and short-term movement for most currency pairs. If you are dealing with a volatile currency, or there is a long gap between agreeing a price and paying the invoice, push the buffer higher.
Where do I find the rate I actually get?
Look at a recent bank statement or payment provider transaction and divide the amount debited in your currency by the amount in the supplier's currency. That gives you your real, all-in effective rate, spread and fees included.
How do currency swings affect dropshipping margins?
Directly and often invisibly. If you buy in one currency and sell in another, a five percent adverse move takes roughly five percent off your landed cost advantage. On a thirty percent margin, that is a sixth of your profit gone without a single price changing on your site.
Should I price my store in multiple currencies?
Showing local currency generally improves conversion, but do not let automatic conversion set your prices. Set each market's price deliberately, using a buffered cost like the one this calculator produces, so no market ends up unprofitable.
How this fits with your other numbers
Currency risk is invisible until it is expensive. A store buying in one currency and selling in another carries an exposure it never chose, and because the change happens gradually there is rarely a moment that prompts a review. Building a buffer into your cost assumption is the simplest defence available.
Update the rate whenever you revisit pricing, and check your actual effective rate from a real transaction rather than a published one. If the currency pair you deal with is volatile, consider holding a balance in the supplier's currency when the rate is favourable — but treat that as a business decision rather than a trade, and keep the buffer regardless.