ISO 27001 Cost Calculator
Adjust the inputs below — results update in real time.
Optional. Persons doing work under the ISMS — drives the certification audit duration.
Optional — sharpens estimate confidence.
Select the frameworks you already operate — overlapping controls reduce the modelled effort.
Model Reference Comparison
Adjusted for your profile: Technology, Medium (51–250).
What is the model reference?
A representative comparison generated with the same ISMSCalculator engine and predefined organisation assumptions. It is not observed market data.
Looking for an ISO 27001 cost benchmark? ISMSCalculator currently provides a representative model reference rather than observed market benchmark data.
Your modelled effort is above the model reference compared with a representative Technology organisation of this size, generated with the same cost model.
Technology model reference
Technology model reference
certification audit
surveillance + upkeep
The model reference is adjusted to your scope. The factors above show how your configuration compares with a representative implementation — modelled impact, not measured market data.
Qualitative practitioner guidance for this sector — not measured statistics.
Medium (51–250) · Technology
Calculated Sep 11, 2026 · ISO_COST_ENGINE_2.0
Estimated Cost Range
Your biggest cost drivers
Modelled impact versus a neutral reference scenario — modelled effect, not measured causality.
- Current ISMS maturityadds ~12 modelled days+€10,800
- IT estate sizeadds ~6 modelled days+€5,400
- Sector complexityadds ~4 modelled days+€3,600
4 of 10 important planning inputs are organisation-specific. 7 material assumptions still use model defaults.
Confidence improves when you provide: Effective personnel · Number of locations · Infrastructure model · Existing control reuse · Delivery model · Target certification timing
Model-confidence indicator, not a statistical confidence interval. The planning range widens when more inputs are assumptions.
Implementation Roadmap
9-month visual timeline (33 weeks total)
Drag the handle at the right edge of any phase bar to adjust its duration.
3-Year Planning Outlook
Year 1 implementation and certification, plus two years of modelled ISMS operation.
- Internal implementation labour47d
- €28,200
- External consulting47d
- €56,400
- Initial certification audit10.4d
- €13,520
- Training
- €8,000
- Tooling / GRC software
- €20,000
- Ongoing internal ISMS operation23.5d
- €14,100
- Surveillance planning allowance3.4d
- €4,420
- Tooling / GRC software
- €20,000
- Awareness / training refresh
- €3,200
- Optional external support
- €0
- Ongoing internal ISMS operation23.5d
- €14,100
- Surveillance planning allowance3.4d
- €4,420
- Tooling / GRC software
- €20,000
- Awareness / training refresh
- €3,200
- Optional external support
- €0
Recurring planning assumptions
Editable planning defaults. Each one is an ISMSCalculator default assumption — transparent and overridable, never an empirical industry average.
Not included in this 3-year planning outlook. Recertification normally falls at the end of a certification cycle, outside this horizon.
The surveillance allowance is modelled as a share of the modelled initial audit duration. It is a default assumption, not an ISO-required or ISO-calculated figure; the precise basis in ISO/IEC 27006-1 still requires methodology verification.
A planning outlook over three years, not a representation of the formal certification cycle. Recurring values are ISMSCalculator default assumptions, not industry averages.
Outlook model ISO_TCO_MODEL_1.0 · Engine version ISO_COST_ENGINE_2.0