Currency Exchange Calculator
Estimate a currency conversion from the exchange rate and fees you enter. No live rates are fetched.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Enter the amount in source-currency units, the quoted target units per source unit, and any provider fees. The model deducts the fixed fee first, applies the percentage fee to the remainder, then converts it. The optional mid-market rate is a comparison reference only. Rates and fee rules vary by provider and date; check the current quote and terms. Costs are estimated in source units, while the amount received is in target units. A negative net cost means the entered rate advantage is estimated to exceed the fees.
Worked example
calculated with the default values below
Amount in source currency 1,000 · Quoted rate (target units per source unit) 0.92 · Reference mid-market rate (optional) 0.94 · Percentage fee on remainder after fixed fee 2.5 % · Fixed fee in source currency 0 Estimated amount received (target units) 897.00 · Effective rate including fees (target/source) 0.897000 · Percentage fee (source units) 25.00 · Rate difference vs reference (source units) 20.74 · Net cost vs reference (source units) 45.74 · Net cost as a percentage of amount 4.57 %
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
Aₙ = max(0, A − min(A,F)); P = Aₙ·p/100; Y = (Aₙ − P)·r; S = (Aₙ − P)·(M − r)/M; T = min(A,F) + P + S
- A
- Amount in source-currency units
- F
- Fixed fee in source-currency units
- p
- Percentage fee (%)
- r
- Quoted target units per source unit
- M
- Optional mid-market reference rate
- P
- Percentage fee (source units)
- Y
- Amount received (target units)
- S
- Rate difference vs reference (source units)
- T
- Net cost vs reference (source units)
Costs are shown in source-currency units. The fixed fee is deducted first; the percentage fee applies to the remainder. The rate difference is converted to source units using the optional mid-market reference; without a reference, only entered fees are counted.
Frequently asked questions
What does net cost versus the reference rate include?
The fixed fee is deducted from the source amount first; the percentage fee applies to what remains. The remaining amount is converted at the quoted rate. If you enter a mid-market reference, the rate difference is converted back to source-currency units and added to the fees. Without that reference, the calculator counts only entered fees. It does not fetch live rates; verify the current provider quote and terms. A negative net cost means the entered rate advantage is estimated to outweigh the fees.