5x1000m w/60s rest, is this a fair indicator for a 5k and 10k or just 5k?

Yes.

Did you wear spikes? What surface did you run these on? Are you training for a road, track, or xc 5k?

19:00ish.

I've done 5*1000m w/90 standing rest on the track and my rep pace was exactly my 5k road pace. The workout was a real ball buster and the race was a lifetime PB.

Close enough. 19-21 depending on how much of a workout warrior you are.

10k is close enough to 5k for these estimates. Same 40-44 min range.

Definitely, you may expect 19:30 or even under.

Yeah, I'd say sub-20 is more than likely.

I usually do 5 x 1k with a 2 minute jog recovery, and I can only just hit 1-2 seconds faster than race pace on a good day.

Find a fast road race and give it a shot. Make sure you do a proper warm-up though; by the looks of those splits you've started that workout cold (or just very conservatively).

Coogan says 6 x 1000 with 2.30 recovery and he knows his stuff

amazing how basically no one read the question in the thread title.

5K - yes, fair indicator, esp off of 60s (next time try 6x)
10K - absolutely not

3km

2x200 + 6x1k w/1min-90 seconds rest + 4x200 with 45 seconds rest is a key workout. Your workout times don't mean anything the actual sessions that you do build fitness and allow you get to the start line ready to run fast!

I agree with others that you are closer 19min than 20min shape for a 5k, given similar conditions and surface.

10k... since you are doing decent mileage, a pace conversion from 5k should be pretty accurate for you.

No spikes, did this on a standard 400m track and am training for a road (flat) 5k.

Thanks a bunch! I also think cooler weather and a taper should get me to 19:20-19:30 vs. 20:00 if that is the case. I was very surprised, was guessing before workout that I'd be doing these around 4:10-4:15...

I do the same workout as you almost every week, only with 2minutes rest instead of 60s. My splits are also usually similar too in that I go out conservatively for the first rep and then the last four are right around target pace maybe a little faster. Anyway, this past weekend I ran 20:33 on a hilly 5k road course which tells me I'm in right around 19:50 shape, meaning you should be closer to 19:30 shape.

This is a textbook Greg McMillan workout, and yes it doubles as a predictor if you're consistent with the repeats. The 3:53 x5 (19:25) would be a fair prediction of your 5K ability.

Don’t get too caught up in “indicator workouts” as gospel. Too many people are led to believe that if they hit X workout that it equates to Y race results. It doesn’t. It’s helpful to see how your fitness is progressing over time, and over time you can compare it to your historical data, but that data is yours and yours alone, we are all an experiment of 1. All that(or any workout) indicates with 100% certainty is that you are capable of that workout. The only way to know for sure, the race will tell you that.

I do 8x1000 with 60 sek rec all out at about my 5k race pace, so a 5x1000 all out is for me slightly faster then my 5k race pace. Maybe with only 30 sek rec it will match my 5k race pace. But We Are built different.