Compare a commitment plan for spot instances with an on-demand baseline. Model the workload share covered, effective discount, plan term, upfront payment, and recurring fees. The result reports net savings, savings rate, total plan cost, and estimated upfront payback so you can test whether the commitment remains worthwhile under realistic coverage assumptions.
Positive net savings means the modeled plan costs less than remaining fully on demand. Savings rate normalizes that amount, while payback shows how long modeled monthly savings take to recover the upfront payment.
This model assumes the entered workload and effective discount persist for the term. It does not guarantee provider eligibility or future demand.
A $10,000 monthly baseline with 70% coverage, a 35% discount, and a 12-month term produces $29,400.00 in net savings when upfront cost and fees are zero.
Yes. The uncovered share remains at the entered on-demand baseline cost.
It is added once to total plan cost and included in net savings and payback.
Yes. High fees, low coverage, or a weak discount can make the plan cost more than the baseline.
It is the stable share of baseline workload expected to receive the plan discount.
Not necessarily. Use a realistic effective discount after considering eligible usage and contract terms.
| Variable | Meaning |
|---|---|
| Baseline | Cost of staying fully on demand for one month |
| Coverage | Share of baseline workload receiving the discount |
| Discount | Effective reduction on covered usage |
| Plan cost | Uncovered cost plus discounted covered cost, upfront payment, and fees |