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Credit Rating Transition Calculator

Work out credit rating transition instantly with clear inputs, formula shown and shareable results.

About Credit Rating Transition Calculator

A transition matrix records how ratings migrate over a year. The ratio of upgrades to downgrades — rating drift — is a forward-looking indicator of portfolio quality that moves well before default rates do.

Formula

Transition rates

Each rate = count of that transition / obligors at start; drift = upgrades / (downgrades + defaults)

Worked example

With the default values below, Credit Rating Transition Calculator returns Downgrade And Default Rate of 18.400%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Obligors At The Startaccepts 1–1,000,000
500
Upgraded During The Yearaccepts 0–1,000,000
45
Downgraded During The Yearaccepts 0–1,000,000
80
Defaulted During The Yearaccepts 0–1,000,000
12

Results

Downgrade And Default Rate
18.400%
Upgrade Rate
9.000%
Share Of Ratings Unchanged
72.600%
Upgrades Per Downgrade
0.489

Step by step

  1. 1Values used
  2. 2Transition rates
  3. 3Downgrade And Default Rate= 18.400
  4. 4Upgrade Rate= 9.000
  5. 5Share Of Ratings Unchanged= 72.600
  6. 6Upgrades Per Downgrade= 0.489

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Figures are estimates based on the inputs given. Bank charges, regulatory minima and market rates change and differ between institutions and jurisdictions. This is not financial advice — confirm with your bank or treasury policy.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Figures are estimates based on the inputs given. Bank charges, regulatory minima and market rates change and differ between institutions and jurisdictions. This is not financial advice — confirm with your bank or treasury policy.

Frequently Asked Questions

Why watch drift rather than defaults?

Because downgrades lead defaults by several quarters, so drift gives earlier warning.

What does high stability imply?

Either a genuinely stable book or infrequent review. Check the review cadence before drawing comfort from it.

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