Horse Worming Schedule Calculator
Instantly calculate your horse’s next worming due date. Free equine deworming planner based on age, grazing risk and faecal egg count testing.
Calculate Your Next Worming Date
Enter your horse’s last worming date and a few details below to get an instant, recommended next due date based on age, grazing risk and testing approach.
Worming Planner
Enter your horse’s details to see the next due date
The date your horse was last treated or had a clear faecal egg count
Younger and older horses generally need closer monitoring
Shared and high-density grazing increases worm burden risk
FEC-based programmes treat only when egg counts indicate a need
Your Worming Schedule
Based on standard equine parasite control guidance
Standard Worming Interval Guide
Typical recommended intervals by horse category, for quick reference when planning a parasite control programme.
| Horse Category | Recommended Interval | Preferred Method | Notes |
|---|---|---|---|
| Foal (under 6 months) | 6 – 8 weeks | Interval dosing | Targets roundworms; FEC less reliable in young foals |
| Weanling / Yearling | 8 weeks | Interval or FEC | Higher natural worm burden risk |
| Adult, low risk | 10 – 12 weeks | FEC-based | Test and treat only if egg count is high |
| Adult, high risk grazing | 8 – 10 weeks | FEC-based | Shared grazing raises reinfection risk |
| Senior (over 15 years) | 8 – 10 weeks | FEC-based | Weaker immunity warrants closer monitoring |
| All horses (annual) | 1 – 2 times per year | Strategic dose | Targeted tapeworm and encysted redworm treatment |
Horse Worming FAQ
Everything you need to know about planning an effective equine worming schedule.
Most adult horses on a faecal-egg-count-based programme are tested every 8 to 12 weeks, with treatment only given when egg counts are high. Horses on a fixed interval dosing programme are typically wormed every 8 to 13 weeks, depending on the product used and grazing risk.
No, worming needs vary by age, grazing environment and individual risk. Foals, weanlings and senior horses generally need more frequent attention due to weaker immunity, while horses on low-risk, well-managed pasture with small group sizes can often be treated less frequently.
A faecal egg count (FEC) is a laboratory test that measures the number of worm eggs in a horse’s droppings. It helps identify which horses actually need worming, reducing unnecessary treatments and helping to slow the development of wormer resistance.
Most equine vets now recommend a faecal-egg-count-based approach for adult horses, treating only when needed, combined with a strategic tapeworm and encysted small redworm treatment once or twice a year. Fixed interval dosing is simpler but can contribute to wormer resistance if used indiscriminately.