Cat Heat Cycle Calculator & Tracker

Female cats (queens) are seasonally polyestrous, meaning they cycle into heat multiple times during breeding season (spring/summer). Heat cycles last 5-7 days and repeat every 2-3 weeks unless the cat mates or is spayed. Our calculator helps track these cycles and predict when your cat will next go into heat.

Heat Cycle Basics

• First heat: 5-9 months of age (can be as early as 4 months)
• Cycle length: Every 14-21 days during breeding season
• Heat duration: 5-7 days (can extend to 10 days if not mated)
• Breeding season: Spring/summer (Feb-Sep in Northern Hemisphere)
• Indoor cats: Can cycle year-round due to artificial lighting

Signs Your Cat is in Heat

• Excessive, loud vocalization (yowling, crying)
• Rolling on floor, rubbing against furniture
• Raised hindquarters with tail to side ("lordosis")
• Increased affection or uncharacteristic aggression
• Trying to escape outdoors
• Spraying/marking territory with urine
• Decreased appetite

Why Spaying is Recommended

Spaying before the first heat provides maximum health benefits: 90% reduction in mammary cancer, zero risk of uterine infections (pyometra), and no heat cycles. Best done at 4-6 months of age.