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NetTools
Turns an SLA percentage like '99.9%' into a concrete number of minutes you can actually be down.
Going from 99% to 99.9% cuts allowed downtime from about 3.65 days/year to under 9 hours/year — each additional nine of uptime typically requires disproportionately more engineering effort and cost to achieve.
This calculates the theoretical downtime budget an SLA allows — actual incident tracking (counting real outages against that budget) is a separate operational practice, not something this simple calculator does.
Allowed downtime/year (min)
525.96
The classic 'nines' — 99.9% ('three nines') allows about 8.77 hours of downtime per year; 99.99% ('four nines') allows about 52.6 minutes.
What you entered
Allowed downtime fraction
1 − 99.9%= 0.1%Downtime minutes per year
0.1% × 365.25 × 24 × 60= 525.96 min/yrResult
Allowed downtime/year (min): 525.96
A 99.9% SLA allows 525.959999999942 minutes of downtime per year (about 43.829999999995174 minutes/month).