Interpret surface swab results, estimate the likely cause of contamination, and calculate how much money was likely spent on the methamphetamine that produced it — based on published New Zealand research and current street pricing by region.
NOTE: If your results show a ‘Theoretical Maximum’ or ‘Potential Maximum’, this figure does not represent the methamphetamine level in any individual sample. It is the combined total across all samples analysed. This value indicates the theoretical maximum concentration that would occur if all detected methamphetamine were present in a single sample.
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SMOKED DOSES
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Values entered:
Individual Sample Meth Level: – µg/100cm²
Sample Area: – cm²
Room Floor Area: – m²
Region: –
Decision standard: –
Estimated spend on methamphetamine
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| Unit purchase size | Price per unit | Units needed | Total spend |
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Street prices: NZ Drug Trends Survey 2025, Massey University SHORE & Whāriki Research Centre (Wilkins et al., January 2026). Prices are indicative only.
This calculator is an indicative guide based on published New Zealand research. Results represent the estimated floor area surface load only and should not be used as a substitute for professional assessment. The standard selected above determines whether you are using the conservative NZS 8510:2017 framework (1.5 µg/100cm² action threshold and 0.5 µg/100cm² post-remediation clearance level) or the Residential Tenancies (Managing Methamphetamine Contamination) Regulations 2026 (15 µg/100cm² maximum acceptable level and 30 µg/100cm² maximum inhabitable level). Calculation is based on a smoking bioavailability factor derived from published research. Street prices sourced from the NZ Drug Trends Survey 2025 (Wilkins et al., Massey University; January 2026). Spend estimates are indicative only and prices vary greatly and change over time.