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Tool No. 04

Taper
Calculator

Enter your peak week mileage and race date to get a personalized taper schedule. Reduce volume at the right rate so you arrive at the starting line fresh and sharp instead of flat and under-trained.

Your Race Info
Your highest mileage training week before taper begins
Standard works for most runners. Aggressive if you recover fast; Conservative if you feel flat after big drops.
Advanced runners can handle less taper reduction
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Enter your race info
to generate your taper

Weekly Mileage Schedule
Taper Madness Index™
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Race Week Field Notes
How It Works
Why Tapering
Works

Tapering is the planned reduction of training volume in the weeks before a race. It sounds simple. In practice it's one of the hardest things to execute — because every instinct tells you to keep working, keep earning it, keep proving you're ready. Those instincts are wrong.

The physiology is clear: your fitness is already locked in by the time taper begins. What the taper does is let your body absorb and consolidate weeks of accumulated training stress. Muscle glycogen stores top up. Micro-damage from hard training heals. The neuromuscular system sharpens. You don't get fitter during the taper — you show up to the start line as the fittest version of you that the training built.

This calculator uses standard evidence-based taper lengths — 2 weeks for a half marathon, 3 weeks for a marathon — with progressive volume reductions that maintain some intensity while cutting total mileage. Intensity is kept so your legs remember how to run fast. Volume is cut so they're not tired when they do.

Common Questions

How long should I taper before a half marathon?

Two weeks is the standard recommendation for most half marathon runners. The first taper week drops to roughly 60–70% of your peak volume. Race week drops to around 30–40%, with most of the running done early in the week. By race morning, your legs should feel loaded and restless — not flat.

Why do my legs feel heavy during taper?

This is taper paranoia — and it's almost universal. When you cut mileage, your body starts storing glycogen in your muscles, which can make them feel dense and unresponsive. It passes. Race morning adrenaline combined with full glycogen stores is exactly what you've been building toward. The heaviness is the point.

Should I run at all during race week?

Yes, but keep it short and easy. Two or three runs of 20–30 minutes early in the week, with a few short strides to remind your legs what fast feels like. A complete rest week tends to leave runners feeling stale and anxious. The goal is to stay loose and sharp, not to add any meaningful training stress.

What's the difference between standard and aggressive taper?

An aggressive taper cuts volume faster and deeper — useful for runners who recover quickly or who've been carrying accumulated fatigue from a high training load. A conservative taper reduces volume more gradually, which suits runners who tend to feel flat after sharp mileage drops. When in doubt, standard is right for most people.

Can I taper too much?

Yes, but it's rarer than under-tapering. A taper that's too long or too deep can leave you feeling flat and detrained on race day — especially for shorter races like 5Ks and 10Ks, where a 3-week taper would genuinely hurt performance. The lengths in this calculator are calibrated to avoid that. For half marathons and marathons, the risk of arriving undertapered is significantly higher than the risk of arriving over-rested.
Field Note
The Taper Paranoia Is Real — And Normal - If you've ever hit the taper and become convinced you're losing fitness — welcome to the club.
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