Olutil stands for Online Utilities — a growing suite of privacy-first, browser-native web tools. This sub-site brings you practical pet calculators that run entirely in your browser. Convert dog and cat ages to human years, estimate daily calories and more — all in one place. 100% Local Processing
Convert your dog's age to human years with a size-based veterinary curve.
Convert your cat's age to human years using the common cat-years chart.
Estimate daily calorie needs from weight using RER and MER formulas.
Estimate a cat's daily calorie needs from weight and life stage.
Convert a dog's calorie needs into grams of food per day and per meal.
Turn a cat's calorie needs into grams of food per day and per meal.
Estimate adult weight from current weight and age, plus a feeding range.
Find the minimum crate length, width and height from your dog's adult weight.
Work out how many litter boxes your cats need with the N+1 rule.
Check a dog or cat's body condition from weight, girth and a 1-9 score.
Estimate a dog or cat's typical life expectancy and remaining years.
Estimate yearly food, vet, grooming and insurance costs for a pet.
Generate random dog and cat name ideas by style, gender and starting letter.
See a dog or cat's life stage, human-age reference and care focus.
Estimate theobromine dose and risk from chocolate a pet has eaten.
Check grape or raisin intake against an approximate concern threshold.
Estimate onion, garlic and other allium risk for dogs and cats.
Estimate a dog or cat's due date range and current pregnancy week.
See a reference dog and cat vaccine timeline from your pet's age.
Estimate a common medicine dose from weight and tablet strength.
Estimate daily drinking water for a dog or cat from weight and weather.
Estimate kennel cost from nights, daily rate and add-ons.
Estimate daily walk minutes and step counts by size, age and activity.
Estimate daily interactive play time and sessions by age and lifestyle.
Estimate a dog's due date and follow weekly fetal development.
Estimate a cat's due date and follow weekly fetal development.
Build a 7-10 day plan with daily old and new food ratios.
Estimate monthly and yearly premiums and deductibles by plan.
All tools on this site perform their work locally in your browser. Your data is never sent to any server, so your pet's details stay on your device. Pick a tool, enter the requested values, click the run button and read the result.
Yes. All processing runs locally in your browser. Your data is not uploaded to any server. You can even use these tools while offline once the page is loaded.
No. Every tool works directly in your web browser using JavaScript. No plugins, extensions or software installation required.
No. The calculators provide general estimates only and are not veterinary advice. If your pet is unwell or you have concerns, consult a veterinarian promptly.