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From Fellrnr.com, Running tips
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Most [[Heart Rate Monitor]]s will display your %HRR if you input your HR<sub>max</sub> and HR<sub>rest</sub>.
=%HRR, %[[VO2max|V̇O2max]], and [[VO2max|V̇O2max]] Reserve=
Just as %HRR is the percentage of the difference between resting and max heart rate, so [[VO2max|V̇O<sub>2</sub>max]] Reserve is the difference between resting V̇O<sub>2</sub> and [[VO2max|V̇O2max]]. If you need to convert %HRR to %[[VO2max|V̇O<sub>2</sub>max]], there's some correlation (r=0.78<ref name="Solheim-"/>), and you can use this formula to get a rough estimate<ref name="SwainLeutholtz1997"/>:
%[[VO2max|V̇O<sub>2</sub>max]] = %HRR x 1.12 – 12
So, if you're at 60% of HRR, that's (60 x 1.12) – 12 = 55% [[VO2max|V̇O<sub>2</sub>max]].