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🧮 Calculators
Percentage, unit conversion, date math, and revenue — all free, all in your browser.
% Percentage
📐 Unit Converter
📅 Date Calc
💰 Revenue
Percentage Calculator
Tip Calculator
Bill amount ($)
Tip %
10%
15%
18%
20%
25%
Discount / Sale Price
Original price ($)
Discount %
% Change
Old value
New value
Unit Converter
Convert
Length
Weight
Temperature
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Date Calculator
Days Between Dates
Start date
End date
Add / Subtract Days
Start date
Days (+ to add, − to subtract)
Revenue Calculator
Product Revenue
Price per unit ($)
Units sold
Refund rate %
MRR Calculator
Monthly price ($)
Subscribers
Monthly churn %
Yearly from Monthly
Monthly revenue ($)
Monthly growth %