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fin.national-debt-sustainability Calculator
Calculates the sustainability condition for public debt from real growth rate, real interest rate, primary surplus, and current debt/GDP. Debt is sustainable when (r − g) × debt/GDP < primary surplus — the austerity debate is whether cutting the surplus raises r − g enough to offset the direct effect.
Inputs
Debt Pct Gdp
Rate of charge flow (A). I = V/R. Above ~100 mA through the body can be lethal. Fuses protect against overcurrent.
R Real Pct
The rate at which interest accrues. Small differences compound dramatically — compare carefully when choosing between lenders.
G Growth Pct
Annual percentage increase. Enter as a percentage. Compound growth is exponential — small differences in rate become enormous over long periods.
Primary Balance Pct
Reference formula or conversion factor shown for context.
Results
change in debt/GDP ratio (ppt)
The proportional relationship between two quantities.
next period debt/GDP (%)
Sample size or count used in the calculation.
stabilizing primary balance/GDP
Sample size or count used in the calculation.
Δd = (r-g)d - pb
Reference formula or conversion factor shown for context.
sustainability condition
Sample size or count used in the calculation.
IMF benchmark
Reference value for comparison — the industry standard, historical average, or target that this result is measured against.