Guinea Pig Pregnancy Calculator - Cavy Due Date | LazyTools

Guinea Pig Pregnancy Calculator

Calculate your guinea pig's due date instantly — enter the mating date and get the pup arrival date, current gestation stage and full 68-day cavy pregnancy timeline, including essential vitamin C care notes.

68-day avg gestation Cavy due date Vitamin C guide Pup development stages

Guinea Pig Gestation Calculator Tool

Enter breeding date

Date of mating / breeding (required)

Gestation adjustment (days)

Reset

Normal gestation range: 59–72 days.
Average: 68 days.
Short-haired breeds (American) typically deliver at 63–68 days. Long-haired breeds (Peruvian) may go up to 70–72 days. Younger sows may deliver slightly earlier.

Enter the mating date and click Calculate

Expected farrowing date

Days elapsed

Days remaining

Gestation length

Used for this calculation

Expected litter

2–4 pups average (range 1–8)

Typical for guinea pig

Pregnancy progress

Gestational stage

Fertilisation & Early Development

Days 0–14

Eggs fertilised; cell division begins. No visible signs.

Embryonic Stage

Days 15–35

Organs begin forming. Sow may show slight increase in appetite.

Fetal Development

Days 36–50

Pups clearly visible through abdominal wall on palpation.

Rapid Growth

Days 51–60

Pups gain most birth weight. Abdomen very distended.

Pre-Birth

Days 61–68

Pubic symphysis separation visible (3–4 weeks post-mating in young sows). Pups fully formed.

Looking for another animal gestation calculator?

LazyTools has free gestation calculators for 10 animals. Try the Rabbit Gestation Calculator next.

Rabbit Gestation Calculator →

⭐ User Ratings

Rate this tool

4.8

Based on 94 ratings

Was this guinea pig gestation calculator helpful?

Thank you for rating this guinea pig gestation calculator!

Features

Why use this free guinea pig gestation calculator?

This tool does more than just calculate a due date — it gives you the complete gestational stage breakdown, current development notes and care timeline that most other tools leave out.

📅

Accurate due date calculation

Enter the mating date and get the expected farrowing date based on the 68-day average gestation, with early and late estimate options.

📈

Gestational stage with progress bar

See exactly which of the 5 gestational stages your animal is currently in, with a visual progress bar showing how far through the pregnancy you are.

🔍

Days elapsed and remaining

Know exactly how many days have passed since mating and how many days remain until the expected farrowing date.

🪨

Breed adjustment option

Choose early (59 days), average (68 days) or late (72 days) gestation to account for breed variation and individual differences.

📋

Signs and symptoms guide

Full checklist of pregnancy signs and pre-farrowing indicators so you know what to watch for at every stage.

🔒

100% free and browser-based

No registration, no app download, no personal data collected. Works on desktop, tablet and mobile. Results instantly in your browser.

How to use

How to calculate your guinea pig's due date

Enter the mating or breeding date

Select the date the mating took place using the date picker. If mating occurred over multiple days, use the first confirmed mating date for the earliest estimate or the last date for the latest.

Select the gestation adjustment

Choose from average (68 days), early estimate (59 days), or late estimate (72 days) to account for breed or individual variation. The average is the best starting point.

Click Calculate Due Date

The calculator instantly shows the expected farrowing date, days elapsed, days remaining, pregnancy progress bar and the current gestational stage with development notes.

Monitor the pregnancy signs

Use the signs and symptoms section below to know what to watch for as the pregnancy progresses and begin your pre-farrowing preparations in the final stage.

Reference

Guinea Pig gestation timeline — stage by stage

Period	Stage	Key events & signs
Week 1 (Days 1–7)	Fertilisation	Cell division begins
Week 2 (Days 8–14)	Implantation	Embryo attaches to uterine wall
Week 3 (Days 15–21)	Organ formation begins	Appetite may increase
Week 4 (Days 22–28)	Major organ development	50mg Vit C daily
Week 5 (Days 29–35)	Fetal stage	Pups detectable by palpation
Week 6 (Days 36–42)	Rapid growth	Abdomen visibly distended
Week 7 (Days 43–49)	Final development	Increase to 100mg Vit C
Week 8 (Days 50–56)	Pup movement visible	Restrict high surfaces
Week 9–10 (Days 57–72)	Birth window	Monitor closely; 68-day average

Signs of farrowing approaching:

Noticeable weight gain from week 4
Enlarged, distended abdomen
Pup movement visible through abdominal wall
Increased water and food consumption
Reduced activity and less grooming
Pubic symphysis gap visible in young sows

Pre-farrowing care checklist:

Vitamin C is critical: 50mg/day (increase to 100mg last 2 weeks)
Separate from boar immediately after mating
Fresh vegetables high in vitamin C daily (capsicum, parsley)
Vet check mid-pregnancy
Avoid ramps and high surfaces from week 5
Quiet nesting area with soft bedding

vs the competition

How this guinea pig gestation calculator compares

Most free guinea pig pregnancy calculators show only a due date. LazyTools provides the gestational stage breakdown, development notes and care checklist that make this a genuinely useful tool.

Feature	LazyTools	Guinea Lynx	PetMD	The Spruce Pets
Shows due date	✓	✓	✓	✓
Week-by-week stage breakdown	✓	✗	✗	✗
Vitamin C dosage guide	✓	✗	✗	✗
Pubic symphysis warning	✓	✗	✗	✗
Signs checklist	✓	✗	✗	✗
Pup development notes	✓	✗	✗	✗

Complete guide

Guinea Pig Gestation Period: Complete Guide

How long is a guinea pig pregnant? Complete cavy gestation timeline

See the interactive calculator above for a personalised guinea pig gestation timeline based on your specific breeding date. The information below provides the complete background on guinea pig pregnancy.

Guinea pig pregnancy stages week by week

The critical role of vitamin C in guinea pig pregnancy

Signs of guinea pig pregnancy: what to look for

Guinea pig pups: what to expect at birth

Caring for a pregnant guinea pig: diet, housing and vet care

The pubic symphysis: why first breeding age matters for guinea pigs

The guinea pig gestation period averages 68 days, with a normal range of 59 to 72 days. Use the interactive guinea pig gestation calculator above to calculate the expected farrowing date from any mating date. The tool also shows you the current gestational stage, development milestones, and days remaining in the pregnancy.

Frequently asked questions about guinea pig gestation

How long is a guinea pig pregnant?

Guinea pigs are pregnant for an average of 68 days (about 9-10 weeks), with a range of 59 to 72 days. Larger litters tend to result in shorter gestation.

What is the guinea pig gestation period?

The cavy gestation period averages 59-72 days with the most common duration being 63-68 days. This is longer than most similarly-sized small animals.

What vitamins does a pregnant guinea pig need?

Vitamin C is the most critical supplement for pregnant guinea pigs. They cannot synthesize their own vitamin C and need 50mg per day during pregnancy, increasing to 100mg per day in the final 2 weeks. Provide through fresh vegetables (capsicum, parsley, kale) rather than water supplements.

How many pups does a guinea pig have?

The average guinea pig litter is 2-4 pups, though litters of 1-8 are possible. Importantly, guinea pig pups are born fully furred, with eyes open and able to eat solid food within hours of birth.

When should I separate a pregnant guinea pig from others?

Separate the pregnant sow from any boars (males) immediately after mating to prevent back-to-back pregnancies. She can remain with other sows throughout her pregnancy.

What is a guinea pig pup like at birth?

Guinea pig pups are precocial - they are born fully furred, with eyes and ears open, and all teeth present. They can walk immediately and begin eating solid food within hours, though they also nurse for 3-4 weeks.

Can you feel guinea pig pups moving?

Yes. Guinea pig pups become visible through the mother's abdominal wall from around day 50 onwards, and movement can be felt and sometimes seen from around day 40. This is a normal and reassuring sign.

Is it safe for a guinea pig to be pregnant?

Guinea pigs have a relatively high pregnancy risk, particularly if a sow over 7 months of age has never been bred before. The pubic symphysis can fuse, making natural birth impossible. First breeding should occur before 7 months of age. Pregnant guinea pigs should be monitored closely.

What should I not do with a pregnant guinea pig?

Avoid: handling roughly, high surfaces or ramps after week 5, stress, sudden diet changes, and vitamin C deficiency. Do not use medicated bedding or treatments without vet approval.

🔗 Related calculators

More free animal gestation calculators

Rabbit Gestation Calculator

Fast 31-day rabbit gestation and kindling date.

Cat Pregnancy Calculator

65-day feline gestation and kitten due date.

Dog Pregnancy Calculator

63-day canine whelping date calculator.

Goat Gestation Calculator

150-day goat gestation and kidding date.

Sheep Gestation Calculator

147-day ewe lambing date calculator.

Swine Gestation Calculator

Pig farrowing date with 3-3-3 rule.