Reverse Goal Splitter

🎯 Final goal + date → auto reverse-split into weekly & daily tasks

5 presets (marathon · book · exam · diet · coding) + 25/50/75% milestones + ICS calendar · Google Calendar · shareable URL.

1. Goal type preset

Full-marathon prep with 3–5 runs per week and progressive distance.

2. Goal + dates

Total span

112 days

Weeks

16 weeks

Elapsed

0%

D-day

Sun, Nov 1, 2026

3. Milestones (25 · 50 · 75 · 100%)

  • 25% checkpoint

    Sun, Aug 9, 2026

    Base building — 20km/week, easy 5km runs

  • 50% checkpoint

    Sun, Sep 6, 2026

    Volume build — 30km/week, long run 10–15km

  • 75% checkpoint

    Sun, Oct 4, 2026

    Peak mileage — 40–50km/week, long 20–28km + intervals

  • Goal reached 🎉

    Sun, Nov 1, 2026

    Taper — cut volume 50%, rest + carb-load

4. Weekly tasks (reverse-split)

WeekSpanPhaseCumulativeMajor tasks
W12026-07-12 → 2026-07-18Habit week — 3×5km easy runs6%
  • Base building — 20km/week, easy 5km runs
W22026-07-19 → 2026-07-25Habit week — 3×5km easy runs13%
  • Base building — 20km/week, easy 5km runs
W32026-07-26 → 2026-08-01Habit week — 3×5km easy runs19%
  • Base building — 20km/week, easy 5km runs
W42026-08-02 → 2026-08-08Habit week — 3×5km easy runs25%
  • Base building — 20km/week, easy 5km runs
W52026-08-09 → 2026-08-15Habit week — 3×5km easy runs31%
  • Volume build — 30km/week, long run 10–15km
W62026-08-16 → 2026-08-22Build week — 4 runs, long 12–18km38%
  • Volume build — 30km/week, long run 10–15km
W72026-08-23 → 2026-08-29Build week — 4 runs, long 12–18km44%
  • Volume build — 30km/week, long run 10–15km
W82026-08-30 → 2026-09-05Build week — 4 runs, long 12–18km50%
  • Volume build — 30km/week, long run 10–15km
W92026-09-06 → 2026-09-12Build week — 4 runs, long 12–18km56%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W102026-09-13 → 2026-09-19Build week — 4 runs, long 12–18km63%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W112026-09-20 → 2026-09-26Build week — 4 runs, long 12–18km69%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W122026-09-27 → 2026-10-03Peak week — intervals + 22–28km long run75%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W132026-10-04 → 2026-10-10Peak week — intervals + 22–28km long run81%
  • Peak + 30km simulation run
W142026-10-11 → 2026-10-17Peak week — intervals + 22–28km long run88%
  • Peak + 30km simulation run
W152026-10-18 → 2026-10-24Taper week — reduce volume, focus on recovery94%
  • Peak + 30km simulation run
  • Taper — cut volume 50%, rest + carb-load
W162026-10-25 → 2026-10-31Taper week — reduce volume, focus on recovery100%
  • Taper — cut volume 50%, rest + carb-load

5. Next 14 days — daily tasks

  • Sun, Jul 12, 2026 · W1

    Long run (weekly peak)

  • Mon, Jul 13, 2026 · W1

    Rest — 20min stretching

  • Tue, Jul 14, 2026 · W1

    5km easy run (Zone 2)

  • Wed, Jul 15, 2026 · W1

    Strength training 40min

  • Thu, Jul 16, 2026 · W1

    Interval / tempo run

  • Fri, Jul 17, 2026 · W1

    Cross-training (bike/swim)

  • Sat, Jul 18, 2026 · W1

    Rest or 30min easy jog

  • Sun, Jul 19, 2026 · W2

    Long run (weekly peak)

  • Mon, Jul 20, 2026 · W2

    Rest — 20min stretching

  • Tue, Jul 21, 2026 · W2

    5km easy run (Zone 2)

  • Wed, Jul 22, 2026 · W2

    Strength training 40min

  • Thu, Jul 23, 2026 · W2

    Interval / tempo run

  • Fri, Jul 24, 2026 · W2

    Cross-training (bike/swim)

  • Sat, Jul 25, 2026 · W2

    Rest or 30min easy jog

6. Share · Calendar export

https://dsplit.bal.pe.kr/?goal=Finish+a+42.195km+full+marathon&target=2026-11-01&start=2026-07-12&preset=marathon

When is it useful?

Ramp marathon mileage week-by-week with 100 days to go

Reverse-split daily word counts until book submission

Schedule textbook passes, past papers, and mocks by exam date

Read the guide or browse the FAQ.