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

Sat, Sep 5, 2026

3. Milestones (25 · 50 · 75 · 100%)

  • 25% checkpoint

    Sat, Jun 13, 2026

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

  • 50% checkpoint

    Sat, Jul 11, 2026

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

  • 75% checkpoint

    Sat, Aug 8, 2026

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

  • Goal reached 🎉

    Sat, Sep 5, 2026

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

4. Weekly tasks (reverse-split)

WeekSpanPhaseCumulativeMajor tasks
W12026-05-16 → 2026-05-22Habit week — 3×5km easy runs6%
  • Base building — 20km/week, easy 5km runs
W22026-05-23 → 2026-05-29Habit week — 3×5km easy runs13%
  • Base building — 20km/week, easy 5km runs
W32026-05-30 → 2026-06-05Habit week — 3×5km easy runs19%
  • Base building — 20km/week, easy 5km runs
W42026-06-06 → 2026-06-12Habit week — 3×5km easy runs25%
  • Base building — 20km/week, easy 5km runs
W52026-06-13 → 2026-06-19Habit week — 3×5km easy runs31%
  • Volume build — 30km/week, long run 10–15km
W62026-06-20 → 2026-06-26Build week — 4 runs, long 12–18km38%
  • Volume build — 30km/week, long run 10–15km
W72026-06-27 → 2026-07-03Build week — 4 runs, long 12–18km44%
  • Volume build — 30km/week, long run 10–15km
W82026-07-04 → 2026-07-10Build week — 4 runs, long 12–18km50%
  • Volume build — 30km/week, long run 10–15km
W92026-07-11 → 2026-07-17Build week — 4 runs, long 12–18km56%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W102026-07-18 → 2026-07-24Build week — 4 runs, long 12–18km63%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W112026-07-25 → 2026-07-31Build week — 4 runs, long 12–18km69%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W122026-08-01 → 2026-08-07Peak week — intervals + 22–28km long run75%
  • Peak mileage — 40–50km/week, long 20–28km + intervals
W132026-08-08 → 2026-08-14Peak week — intervals + 22–28km long run81%
  • Peak + 30km simulation run
W142026-08-15 → 2026-08-21Peak week — intervals + 22–28km long run88%
  • Peak + 30km simulation run
W152026-08-22 → 2026-08-28Taper week — reduce volume, focus on recovery94%
  • Peak + 30km simulation run
  • Taper — cut volume 50%, rest + carb-load
W162026-08-29 → 2026-09-04Taper week — reduce volume, focus on recovery100%
  • Taper — cut volume 50%, rest + carb-load

5. Next 14 days — daily tasks

  • Sat, May 16, 2026 · W1

    Rest or 30min easy jog

  • Sun, May 17, 2026 · W1

    Long run (weekly peak)

  • Mon, May 18, 2026 · W1

    Rest — 20min stretching

  • Tue, May 19, 2026 · W1

    5km easy run (Zone 2)

  • Wed, May 20, 2026 · W1

    Strength training 40min

  • Thu, May 21, 2026 · W1

    Interval / tempo run

  • Fri, May 22, 2026 · W1

    Cross-training (bike/swim)

  • Sat, May 23, 2026 · W2

    Rest or 30min easy jog

  • Sun, May 24, 2026 · W2

    Long run (weekly peak)

  • Mon, May 25, 2026 · W2

    Rest — 20min stretching

  • Tue, May 26, 2026 · W2

    5km easy run (Zone 2)

  • Wed, May 27, 2026 · W2

    Strength training 40min

  • Thu, May 28, 2026 · W2

    Interval / tempo run

  • Fri, May 29, 2026 · W2

    Cross-training (bike/swim)

6. Share · Calendar export

https://dsplit.bal.pe.kr/?goal=Finish+a+42.195km+full+marathon&target=2026-09-05&start=2026-05-16&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.