Cat colony calculator: projection with and without TNR

How it works

The calculator projects how many cats there will be at the end of each year in two scenarios: with the sterilization effort you choose and without TNR. For the TNR scenario it gives a central estimate and a likely range. It also calculates the recommended effort to reach 80% per colony, when all colonies reach it in the typical case, the births avoided and, if you enter the costs per female and per male, the spending.

It is a projection, not a prediction: it shows what can be expected from the data entered, not what will happen. It is not an official plan and does not replace the judgement of the program’s technical and veterinary team.

The model is based on published studies of colonies managed with TNR. The sources are cited by name in the PDF report; the model’s parameters are not published.

The people who care for the colonies

These projections, including the “without TNR” one, assume that the people who care for the colonies keep doing so: feeding, veterinary care and adoptions. The population is maintained largely thanks to their work; without it, the situation would be different and is not reflected here.

Who it is for

• Local governments: to size a municipal TNR program and its budget. See Meow Metrics for local governments.
• Associations: to plan sterilization campaigns with the local government. See Meow Metrics for associations.
• Colony caregivers: to understand what effort their colony needs. See the free account.

Free spreadsheet to keep your colony census

A free spreadsheet without macros to record colonies, cats and interventions. The summary is calculated automatically: per colony, cats alive, sterilized and percentage, with a traffic light when 80% is reached; and for the municipality, totals, colonies at 80%, spending per year and average cost per female and per male. It includes an example. It does not make projections: it only counts what you record.

Email*

Municipality*

Job title*

Organization*

Country*

Choose a countryAndorraArgentinaAustriaBelgiumCanadaChileColombiaCosta RicaDominican RepublicEcuadorFranceGermanyGreeceIrelandItalyLuxembourgMexicoMoroccoNetherlandsPeruPortugalSpainSwitzerlandUnited KingdomUnited StatesUruguayOther country

I agree that Animalia Consulting SL B22619787 stores and processes my personal data to give me access to the free colony spreadsheet and to record my request.

I agree to receive other communications from Animalia Consulting SL B22619787 about MeowMetrics, including an invitation to a demo. I can unsubscribe at any time.

Controller: Animalia Consulting S.L. (B22619787), Paseo de la Castellana, 194, Bajo B, 28046 Madrid (Spain). Contact: info@zoo-metrics.com.

Purposes:
(1) To give you access to the spreadsheet and record your request, together with your organisation, in our customer relationship management system (CRM).
(2) To understand which types of organisations use the tool, for internal statistics.
(3) Only if you tick the second box, to send you communications about MeowMetrics, including an invitation to a demo.

Legal basis:
- (1) and (2): your consent (Art. 6(1)(a) GDPR).
- (3): your consent (Art. 6(1)(a) GDPR and Art. 21 of the Spanish Information Society Services Act, LSSI).

You may withdraw your consent at any time without affecting prior processing.

Required data: email, municipality, job title, organisation and country. Without them we cannot give you access to the spreadsheet.

Recipients: we do not share your data with third parties unless required by law. Our service providers (processors) are:

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• Cloudflare (Turnstile anti-bot check);
• Hostinger (hosting).

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Download the spreadsheet

Frequently asked questions

Does the calculator predict how many cats there will be?

No. It is a projection: it shows what can be expected from the data you enter, with a likely range and a central estimate. It is not a prediction or an official plan.

What does the projection assume about the people who care for the colonies?

That they keep doing so. The projections, including the “without TNR” one, assume that the current care of the colonies continues. Without that work, the situation would be different and is not reflected in the calculator.

What does reaching 80% per colony mean?

It is the calculator’s reference goal: at least 80% of the cats in each colony sterilized. The recommended effort is the one needed to reach it within the years chosen; “light” and “moderate” are part of that effort.

Do I have to sign up or give my details?

No. Calculating is free and needs no sign-up. For the PDF you can leave your details if you would like us to contact you for a demo, or download it without giving any details.

What is sent when I press “Calculate”?

Only the colony data you enter: number of cats and colonies, percentages, effort, years and, if you add them, the costs. We do not ask for any personal data to calculate. To prevent abuse, the calculator uses Cloudflare Turnstile, an anti-robot service that loads when you start using it. For security, the server keeps an access log for up to 30 days with the IP address, the date and the path of the request, without the calculation figures.

Terms of use

This calculator provides a projection, not a prediction: it shows what can be expected from the figures entered, with a likely range and a central estimate, not what will happen. The result depends on the quality of those figures and on general assumptions that may not match the situation of each colony or municipality, so its accuracy is not guaranteed.

The projections, including the “without TNR” one, assume that the people who care for the colonies keep doing so. The population is largely sustained by their work: without it, the situation would be different and is not reflected here.

The result is for guidance only. It is not an official plan and does not replace the judgement of the programme’s technical and veterinary team or professional advice. Animalia Consulting S.L. accepts no liability for decisions based solely on it.

Intellectual property. The calculation method, the model and its parameters, the tool and the design of the PDF report belong to Animalia Consulting S.L. You may not:

• systematically or automatically extract results;
• reverse-engineer it;
• use the calculator to rebuild or reproduce the model.

You may share the PDF unchanged, citing the source (“MeowMetrics”), to report on the management of your colonies.

More information

• Guide: how to set up a municipal TNR program
• Spending checklist for a quality TNR program
• How to get the cat colony grant
• Scientific catalogue on cat colonies
• How the Meow Metrics app works
• Free colony tracking spreadsheet for community cats