Exchange rate buffer calculator
Interactive engineering and procurement calculator. Instant client-side computation with no sign-up.
Order & FX exposure
Suggested buffer
Suggested buffer amount
Value × volatility × √(days ÷ 30)
As a share of the order
Buffer ÷ order value
Your current buffer amount
Value × your buffer %
Shortfall / headroom
Suggested − current (negative = headroom)
Your buffer already covers (or exceeds) the suggested worst case.
About the model
FX moves roughly with the square root of time, so a 3 % monthly volatility becomes about 3 % × √(30 ÷ 30) = 3 % for a one-month payment window. The buffer is a budget guard, not a hedge: for large orders consider a forward contract, a currency hedge or paying in a stable settlement currency. Historical volatility does not guarantee future moves.
Planning an import? The landed cost calculator rolls freight, duty and tax into the final unit price.