# Bid-to-Cover Ratio

Source: https://www.yieldcurve.pro/learn/bid-to-cover

The **bid-to-cover ratio** is the total dollar amount of bids received at a Treasury auction divided by the dollar amount actually awarded. It is the most commonly cited single metric for auction demand.

A bid-to-cover of 2.5x means that for every $1 of Treasuries sold, $2.50 in bids were submitted. Higher ratios indicate stronger demand. The ratio varies by maturity:

- **Bills** (T-bills, 4-week to 52-week) typically see ratios of 2.5x to 3.5x
- **Notes** (2-year to 10-year) typically range from 2.3x to 2.8x
- **Bonds** (20-year and 30-year) typically range from 2.2x to 2.6x

Context matters more than the absolute number. A bid-to-cover of 2.4x for a 10-year auction is unremarkable; the same ratio for a 2-year auction would be on the weak side. The [auctions tool](https://www.yieldcurve.pro/auctions) on this site normalizes each metric against its own historical distribution to produce letter grades from D- to A.

A declining trend in bid-to-cover ratios over successive auctions can signal waning demand and may precede yield increases. Conversely, consistently strong ratios suggest ample demand, which supports lower yields. Traders watch auction results in real time; a weak auction can trigger an immediate selloff across the curve.

## FAQ

### What is a good bid-to-cover ratio?

There is no single threshold. A 2.4x ratio is unremarkable for a 10-year note auction but would be considered weak for a 4-week bill, where ratios above 3.0x are typical. The most useful read is the deviation from the trailing twelve-month average for that specific tenor, which is what the [auctions tool](https://www.yieldcurve.pro/auctions) on this site reports as a letter grade.

### How does bid-to-cover relate to the auction tail?

They measure different things. Bid-to-cover measures the quantity of demand. The tail measures the price quality of that demand: the difference between the highest accepted yield and the when-issued yield prevailing just before the auction. A strong bid-to-cover with a wide tail signals plenty of bidders but pricing well below market expectations — usually a bearish auction overall.

### Why do indirect bidder shares matter alongside bid-to-cover?

Indirect bidders include foreign central banks and other institutional accounts that bid through primary dealers. A high bid-to-cover driven mostly by primary dealers (who are obligated to participate) can mask weak end-investor demand. Strong indirect participation alongside a healthy bid-to-cover indicates genuine, broad-based interest in the issue.