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Norwegian Singles Pace Calculator by Running Explained
Norwegian Singles runs on one number: your sub-threshold pace. This tool estimates your threshold from a recent race or your easy pace, then hands you the exact controlled paces to hit for every interval length, in miles or kilometers. It turns a confusing method into a set of numbers you can actually run.
How to use it?
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Start with what you know. Enter a recent race for the most accurate result, or your current easy pace for a quick estimate.
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Choose your unit. Miles or kilometers, whichever you train in.
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Calculate. You get your threshold pace, target paces by interval distance and duration, and where those paces sit on the intensity scale.
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Run controlled, then check by feel. If you could not run two or three more reps at the end of each one, ease off.
What is sub-threshold pace?
Sub-threshold pace is the controlled effort that sits just below your lactate threshold, the point where your body can still clear lactate about as fast as it produces it. It is the entire engine of Norwegian Singles: spend enough time here and you raise the pace you can hold before fatigue takes over, without the deep fatigue that true threshold running leaves behind. Get this one number right and the method works, which is exactly what the calculator above is for.
For the full picture of how sub-threshold work fits into a training week, read [What is Norwegian Singles Training].
Who is it for?
Any runner curious about Norwegian Singles or sub-threshold training, from first-timers to experienced racers. If you have read about the method and want to run it without guessing at paces, start here. It is a smart estimate, not a lab test, so let effort be the final judge.
The One Rule
Controlled, not hard. Almost everyone who gets this method wrong runs too fast. When in doubt, slow down.
Frequently Asked Questions
What is the Norwegian Singles method?
A high-volume, low-intensity approach built around frequent sub-threshold interval sessions. Instead of the elite "double threshold" days, you run one controlled sub-threshold workout per quality day, usually two or three a week, with everything else kept genuinely easy. The point is to bank a lot of quality work near race intensity without the fatigue true threshold running piles on.
What is sub-threshold pace?
Sub-threshold pace is slightly slower than your lactate threshold, the effort you could hold for about an hour. It sits in a controlled, comfortably hard zone, roughly 2.5 to 3.5 mmol/L of lactate for most runners, where you finish each rep feeling like you could do a few more. Running it too fast is the single most common mistake with this method.
How do I calculate my sub-threshold pace?
The fastest way is to estimate it from a recent race or your easy pace, which is what this calculator does. Enter one number and it returns your target paces for each interval length, in miles or kilometers. A lactate test is the gold standard if you want to be exact, but for most runners a race-based estimate plus honest effort checks gets you there.
How many days a week is Norwegian Singles?
Most runners do two or three sub-threshold sessions per week, with the other days easy and one long run. The quality work should stay around 20 to 25 percent of your weekly volume. More is not better here. The method depends on staying fresh enough to repeat the sessions.
How fast should the intervals be?
Slightly slower than threshold, and the exact pace shifts with interval length. Shorter reps like 400s sit a touch faster, longer reps like 2k or 10-minute efforts a touch slower, but all of them stay controlled. The calculator gives you the specific pace for each.
What workouts does Norwegian Singles use?
Sub-threshold intervals with short recoveries, run as reps rather than one long tempo. Common formats are things like 10 x 1000m, 5 x 6 minutes, or 4 x 2000m, with 60 to 90 seconds of easy jogging between. Total quality time per session usually lands around 20 to 40 minutes.
Is Norwegian Singles good for beginners?
Yes, with one caveat. The structure is simple and the controlled intensity is forgiving, which suits newer runners. The hard part is discipline: keeping easy days truly easy and not racing your sub-threshold sessions. Start at the lower end of reps and let volume grow before pace.
How do I know if I am running too hard?
If you could not comfortably run two or three more reps at the end of a session, you went too fast. Other tells are your heart rate drifting up rep to rep, or your form falling apart late in the workout. When in doubt, slow down.
Norwegian Singles vs Norwegian Doubles, what's the difference?
Doubles is the elite version: two threshold sessions in a single day, morning and evening. Singles adapts that for people with jobs and lives by spreading the work into one session per quality day. Same philosophy of controlled, sub-threshold volume, packaged for a normal schedule.
Do I need lactate testing to do Norwegian Singles?
No. Elite athletes use lactate meters, but recreational runners can run the method well on pace estimates, heart rate, and perceived effort. This calculator gives you pace targets from a race or your easy pace, and the effort check keeps you honest with no equipment.