Biology
Dog Pregnancy Calculator
Track a dog (bitch)'s pregnancy: enter the days since the first successful mating to see how far along she is, how many days remain, and the expected whelping window.
Your inputs
Change any value to update the result instantly.
Days until expected whelping
31 days
Pregnancy completed
50.8 %
Days elapsed
32 days
Stage
Second third of pregnancy
Normal range for this species
58–72 days (typical average 63)
Earliest expected day
58 days
Latest expected day
72 days
From breeding at an unknown stage of the cycle gestation runs 58–72 days; from the day of ovulation it narrows to 62–64 days, which is why ovulation timing gives a far tighter date. Educational estimate only — confirm pregnancy and timing with a veterinarian; this tool is not veterinary advice.
What this calculator does
Estimates the whelping window for a dog from days since mating using published canine gestation lengths.
What your result means
Days remaining to the expected whelping date; breeding-date estimates are inherently wide because sperm survive for days in the tract.
Formula and working
days remaining = gestation length − days elapsed; progress = days elapsed ÷ gestation length × 100
- 1
Collect the inputs
Days since the first successful mating = 32 days; Gestation length used = 63 days
- 2
Apply the formula
days remaining = gestation length − days elapsed; progress = days elapsed ÷ gestation length × 100
- 3
Result
Days until expected whelping = 31 days
Frequently asked questions
Symbols and assumptions
- L
- Gestation length in days
- d
- Days elapsed since breeding
- • 58–72 days from breeding at an unknown cycle stage; 62–64 days from ovulation.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Breeding dates correlate poorly with whelping dates — ovulation timing by progesterone or LH testing is far more accurate. Not veterinary advice.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
Tell us if a formula, unit, explanation, or result needs attention. Your message will include this calculator’s name and page.
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