Fractional CTO vs Full-Time CTO
Cost Calculator
The headline salary is only part of what a full-time CTO costs. Add equity, overhead, and recruiting and the real number climbs fast. Plug in your assumptions to see how a fractional engagement compares over the same period.
Full-time CTO
Fractional CTO
Estimated savings with fractional
$215,000
About 69% less than a full-time hire over 12 months.
Cost over 12 months
Estimates only, for planning purposes. Real costs vary by market, seniority, equity terms, and engagement scope. Equity is priced as the grant value spread over a standard four-year vest.
Not sure whether fractional or full-time is right for your stage?
Why the full-time number is bigger than it looks
Founders tend to compare a CTO's salary to a fractional monthly rate and stop there. But a full-time executive hire carries costs the retainer never does: employer taxes and benefits, equipment and software, and a meaningful equity grant that dilutes everyone. On top of that sits the one-time cost of finding the right person, recruiter fees alone often run a fifth of the salary.
A fractional CTO delivers the same senior decision-making: architecture, roadmap, hiring, vendor oversight, without any of that fixed structure. The trade-off is time: you get leadership and direction, not a full-time builder. For most seed to Series A startups, that is exactly the trade worth making until the work genuinely justifies a permanent hire.
When does fractional make sense — and when does it not?
Fractional CTO engagements work best when the company needs senior technical judgment — architecture decisions, hiring criteria, technical due diligence, vendor selection — but not a full-time builder in the seat. That describes most pre-Series B startups: the engineering team can execute, but there is no one senior enough to set direction confidently, evaluate tradeoffs, or hold the team to production-grade standards.
Fractional does not work well when the real bottleneck is capacity rather than direction. If you have no engineers and just need someone to write code, that is a contractor or agency engagement, not a CTO role. Similarly, if your engineering org has scaled past 20 people, the coordination overhead of a part-time CTO usually creates more problems than it solves. The calculator above helps you see the cost gap at your stage — but the right decision also depends on where the actual constraint is.
The most common trigger for a fractional CTO engagement is a technical co-founder gap: a non-technical founder with a working product who needs senior technical leadership without burning runway on a permanent exec hire before Series A. In that scenario, a fractional arrangement buys six to twelve months of real architectural discipline and hiring credibility — at roughly a fifth of the cost shown on the left side of this calculator.
Frequently asked questions
How much does a full-time CTO actually cost?
Far more than the headline salary. A senior CTO base of $180K–$260K (or £150K–£220K) typically carries another 25–35% in benefits, payroll tax, and overhead, plus an equity grant worth a meaningful share of the company and one-time recruiting fees of 20–25% of salary. Fully loaded, a full-time CTO often costs $300K+ in the first year.
How much does a fractional CTO cost?
Fractional CTO engagements usually run $4,000–$12,000 per month depending on scope, seniority, and time commitment. There is no equity grant, no recruiting fee, and no benefits or overhead, you pay only for the engagement.
When is a fractional CTO the better choice?
At seed to Series A, when you need senior technical leadership: architecture, roadmap, hiring, vendor oversight, but not a full-time executive salary. A fractional CTO gives you the decision-making capability without committing a third of your round to one hire before product-market fit.
How is the equity cost calculated?
The calculator prices the equity grant as its current value (equity percentage × company valuation) spread over a standard four-year vesting schedule, then pro-rates it to your engagement window. It is an estimate: actual equity cost depends on dilution, future valuation, and exit outcomes.
Is this calculator accurate for my market?
It gives a realistic planning estimate, but real costs vary by location, seniority, equity terms, and scope. Adjust the inputs to match offers in your market, the defaults reflect typical US and European startup ranges.
Not sure which model fits your stage?
Book a free call. Tell me where your product and team are, and I'll give you a straight answer on whether a fractional CTO makes sense.