Niche Calculators
Specialized calculators for roofing, ecommerce sellers and more. Browse our collection of 9 free online calculators — fast, accurate, and ready to use.
Roof Pitch Calculator
Calculate roof pitch, slope angle, and rafter length from rise and run measurements for roofing projects.
CalculateAmazon FBA Calculator
Calculate profit and fees for Amazon FBA sellers – estimate net profit, margin, and ROI on each product.
CalculateEtsy Payment Calculator
Calculate Etsy seller fees and net profit from your product sales – listing fees, transaction fees, and payment processing.
CalculateTwitch Bits to USD Converter
Convert Twitch Bits to US dollars and see how much viewers pay versus what streamers earn.
CalculateYouTube Money Calculator
Estimate YouTube earnings from video views using a customizable CPM and RPM rate.
CalculateTattoo Cost Calculator
Estimate tattoo pricing based on size, detail level, color, and the artist hourly rate.
CalculateDog Age Calculator
Convert dog years to human years using an accurate scientific formula with breed size adjustment.
CalculateCat Age Calculator
Convert your cat age to human years and see its life stage from kitten to senior.
CalculateeBay Fee Calculator
Calculate eBay seller fees and net profit including final value fees and shipping.
CalculateExplore More Calculators
Finance Calculators
Mortgage, loans, interest, savings, and retirement planning tools
Health Calculators
BMI, calorie needs, body fat and other fitness tools
General Calculators
Percentages, discounts, dates, age and everyday math tools
Math Calculators
GPA, fractions, statistics, geometry and more math tools
Construction Calculators
Concrete, lumber, roofing, flooring and other building material tools