Free Online Calculators & Tools โ Discounts, Conversions, Pet Age & More
Nulumia is a free online hub of calculators and helpful tools. Calculate discounts, work with numbers and dates, convert units, or check your pet's age in human years, and more โ all without signing up. Every tool runs instantly in your browser. No tracking, no ads in the results.
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Money calculators
Discount Calculator
Find the final price after one or more percent-off discounts.
Loan Payment Estimator
Estimate monthly payment, total interest and amortization for any loan โ educational only, not a loan offer.
Salary Converter
Convert any salary between annual, monthly, weekly, daily and hourly โ works for any country and currency.
Tip Calculator
Calculate restaurant tips with quick presets (15/18/20/25%) and split the bill across any number of people.
Numbers & dates
Percentage Calculator
Four percent calculations in one tool โ what is X% of Y, X is what % of Y, X is Y% of what, and percent change.
Date Calculators
Add or subtract days, count down to a date, count working days, and find ISO and US week numbers.
Age Calculator
Calculate exact age in years, months, weeks, and days from any date.
Unit conversions
Length
Centimeters, meters, inches, feet, miles and more.
Weight
Kilograms, pounds, ounces, stones and grams.
Temperature
Celsius, Fahrenheit and Kelvin.
Volume
Liters, gallons, milliliters, cups and pints.
Area
Square meters, acres, hectares and square feet.
Speed
Kilometers per hour, miles per hour, knots and meters per second.
Kitchen
Cups, tablespoons, grams, pounds โ for baking and cooking.
Pet age calculators
Dog Age Calculator & Lifespan Hub
Convert your dog's age to human years using the AVMA standard formula. Browse 54 breeds, 20 age guides, breed comparisons, and FAQs.
Cat Age Calculator & Lifespan Hub
Convert your cat's age to human years using AAFP feline life-stage guidelines. Browse 20 breeds, 20 age guides, breed comparisons, and FAQs.
All Pet Calculators
74 breeds + 40 ages + 25 comparisons + FAQs
Why Nulumia
- Instant results โ no page reload, no waiting
- No signup, no email required
- No tracking cookies, no third-party scripts in results
- Open, transparent formulas you can verify
Quick links
Image & PDF Tools
Image & PDF Optimizer
Convert images and compress PDFs in seconds โ JPG to PNG, WebP, and more. Free, no signup, runs in your browser.
Open Optimizer โ