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Percentage Calculator
Fast percentage calculations for everyday use.
Open tool →KERVONI TOOL COLLECTION
Business Calculators
Quick browser-based calculators for percentages, discounts, markups, profit and margins.
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Discount & Markup
Calculate discount, markup and final price.
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Profit Margin Calculator
Calculate margin, markup and target selling price.
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Date Difference Calculator
Calculate calendar days, complete weeks and hours between two dates.
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Length, Weight, Temperature & Data Converter
Convert metric and imperial units, temperatures and decimal or binary data sizes.
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Age Calculator
Calculate age in calendar years, months and days on a chosen date.
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VAT Calculator
Add VAT to a net amount or extract VAT from a total with your chosen rate.
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Loan Payment Calculator
Estimate fixed monthly payments, total repayment and interest.
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Tip & Bill Split Calculator
Calculate a tip and split the total equally between people.
Open tool →All listed tools are available without an account. Browser-first tools keep local files on your device unless a feature explicitly says otherwise.