BBT Calculator
Basal Body Temperature - Fertility Tracking
Note: BBT tracking helps identify ovulation patterns and fertile windows.
Take temperature at the same time each morning before any activity for best results.
Temperature Change
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Fertility Status
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Cycle Phase
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Next Steps
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BBT Pattern Interpretation
Normal BBT Range: 97.0-98.6°F (36.1-37.0°C)
Ovulation Temperature Rise: 0.5-1.0°F (0.3-0.6°C)
Luteal Phase: Higher temperatures for 10-16 days
Follicular Phase: Lower, more variable temperatures
Ovulation Temperature Rise: 0.5-1.0°F (0.3-0.6°C)
Luteal Phase: Higher temperatures for 10-16 days
Follicular Phase: Lower, more variable temperatures
Tracking Recommendations
- Take temperature at the same time each morning
- Use a digital basal thermometer for accuracy
- Record temperature before any activity
- Track for at least 3 cycles for patterns
- Note any factors that may affect temperature
- Combine with other fertility signs (cervical mucus, LH tests)
Important: BBT tracking is not a reliable form of contraception.
For family planning, combine with other methods and consult healthcare providers.
Temperature can be affected by illness, stress, travel, and other factors.