Calculate equity vesting schedules with cliff period, vesting duration, acceleration triggers, and unvested share forfeiture modeling.
This calculator turns a grant into a dated list of shares: enter total shares, vesting duration, cliff, and vesting frequency, and it returns how many shares vest on each date plus what you hold at any departure month. It also models single- and double-trigger acceleration and the unvested share forfeiture on early exit. The surprise is usually the cliff: with a one-year cliff on a four-year grant, 25% of the shares vest in one lump at month 12 and the rest monthly after, so nothing vests in the first year even though total time to 100% is unchanged.
A concrete input and expected output from the current implementation.
Input
Grant: 1,200 shares. Vesting: 48 months. Cliff: 12 months. Frequency: monthly. Departure month: 20.
Expected output
Cliff event at month 12: 300 shares (25%). Then 25 shares per month. Vested at month 20: 500 shares (41.7%). Forfeited on departure: 700 shares (58.3%).
The cliff tranche is 25% of the grant, matching 12 of 48 months. The remaining 900 shares spread over the 36 post-cliff months at 25 per month, so month 20, eight months after the cliff, holds 300 plus 200 shares, and the unvested 700 are forfeited.
The grant is split into two tranches. The cliff tranche, equal to the cliff fraction of the total (a 12-month cliff on a 48-month grant is 25%), vests as one event on the cliff date. The remainder divides evenly across the months or quarters after the cliff. The vested total on any date is the cliff tranche plus elapsed post-cliff periods times the per-period amount, rounded to whole shares.
Departure is evaluated month by month. Before the cliff date the report is 0% vested and the full grant forfeited; after it, the vested portion is shown as yours and the remainder as forfeited. With double-trigger acceleration enabled, a change of control followed by termination within the stated window converts the unvested shares to vested, and the schedule recomputes forward from the acceleration date.
The vested shares are yours, and the calculator shows the count at your departure month; the unvested shares are forfeited. Two practical caveats: the company often holds a right to repurchase vested shares within a window after you leave, and turning options into shares requires exercising them, which costs cash and starts the tax clock. The schedule is share counts, not what you net.
No. On a standard four-year grant, the cliff month vests the full first-year tranche, 25%, in a single event, and each of the remaining 36 months adds one-thirty-sixth of the rest, so you are still fully vested at month 48. The cliff changes the shape of the schedule, not the total. What it does mean: leaving in month 11 forfeits everything, because no shares vest before the cliff.
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