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Half marathon training hub

Half marathon training plans, pacing tools, and guides — structured to reduce overwhelm and keep training simple.

Last updated/Feb 03, 2026, 02:17 PM

half marathon

Get faster without sacrificing durability.

For athletes who want one plan with variations — plus pacing guidance that stays controlled under stress.

Time horizon

Train in ~12–26 weeks (choose the plan that fits your base).

Start with a default plan, then customize only what you need.

Start with a plan

Pick one plan. Variations live inside the page so you can choose without overwhelm.

Then use a tool

No signup required. Get numbers you can act on today.

Finish with a guide

Checklists + decision rules for the parts people mess up.

This week

What changed

Updated: Feb 03, 2026, 02:17 PM

  • Added new training plans with smart variations (so you can pick without overwhelm).
  • Improved tools (pace, fueling, cutoffs) so you get numbers you can use immediately.
  • Expanded adaptation rules so missed sessions don’t turn into panic make-up workouts.
  • Expanded race directories and athlete guides with sources and verification timestamps.
Changed pages: /blog/training/half-marathon/14-week-plan, /blog/tools/running-pace-calculator

Coaching beta

Get a plan that adapts to your life.

Join the 26weeks.ai TestFlight beta for adaptive coaching, recovery-aware adjustments, and race-week reminders.

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FAQs

Do I need long runs for a half marathon?

Yes. Long runs build durability; the exact length depends on your base, but consistency matters more than one giant run.

How much speedwork should I do?

One tempo/threshold session plus one long-run focus per week is plenty. Keep the rest truly easy.

What’s the biggest mistake?

Turning easy days into medium-hard days. That steals recovery from the workouts that matter.

Keep going

14-Week Half Marathon Training Plan

A 14-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

16-Week Half Marathon Training Plan

A 16-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

12-Week Half Marathon Training Plan

A 12-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

18-Week Half Marathon Training Plan

A 18-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

20-Week Half Marathon Training Plan

A 20-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

10-Week Half Marathon Training Plan

A 10-week half marathon training plan with week-by-week structure, workouts, adaptation rules, and a pace calculator. Variations are included on one page.

Running Pace Calculator (with Splits)

Convert distance + time into pace per km/mile and generate a splits table. Useful for planning workouts and race pacing.

Race Time Predictor (Riegel Model)

Estimate equivalent 5K/10K/half marathon/marathon times from one known result using a simple model. Useful for goal-setting and pacing.

How to Pace a Marathon (Rules That Prevent Blow-Ups)

Effort-first marathon pacing rules: how to start, when to settle, how to handle hills/heat, and how to avoid the classic late-race crash.

Taper Week Checklist (Arrive Fresh, Not Flat)

A practical taper checklist: what to reduce, what to keep, and what to rehearse so race week is calm and repeatable.

Sources