Basis Points (bps)
A basis point is one hundredth of one percent: 1 bp = 0.01%, and 100 bps = 1%. The unit exists to remove ambiguity when discussing small percentage quantities — fees, spreads, slippage, yield changes — where the difference between "half a percent" and "0.05 percent" is enormous and easily garbled in conversation.
How much is 100 basis points in percent?
100 basis points equal exactly 1%. The conversions are mechanical: 1 bp = 0.01%, 10 bps = 0.1%, 50 bps = 0.5%, 250 bps = 2.5%. To go from basis points to a decimal fraction, divide by 10,000 — so 25 bps is 0.0025. The unit avoids the classic ambiguity of percentage talk: "the fee rose by one percent" could mean from 1.0% to 2.0% or from 1.00% to 1.01%; "rose by one basis point" can only mean the latter. Anywhere small differences compound — and in trading costs they always do — that precision matters.
Why do traders measure costs in bps?
Because the quantities that decide whether short-horizon trading is viable are all small percentages of notional: an exchange fee of a few bps per side, a spread of a few bps on a liquid pair or tens of bps on a thin one, slippage that varies with order size. Expressing them in a common unit makes the arithmetic legible: total round-trip cost in bps is the hurdle a trade must clear before a single bp of real profit exists. A move of 30 bps means nothing by itself; against 25 bps of round-trip cost it is almost nothing, against 5 bps of cost it is a real gain.
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