BackAR 
i made a small free tool for people who work with SLOs.
it is an error budget + burn rate calculator. you put in your target uptime and what you really got, and it shows how much downtime budget you have, how much is left, how fast you are using it, and the point it runs out. no signup, nothing to install. try it.
Uptimepage
Error Budget & Burn Rate Calculator | Uptimepage
Turn an SLO target and your measured availability into error budget spent, budget left and burn rate, with a burn-rate reference table. Free, no sign-up.
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