Calculators
Fast, transparent calculators for common percentage, discount and date questions.
3 tools available
Synthixx Calculators covers everyday numerical questions without collecting an account or sending your values to a server. Percentage Calculator handles a percentage of a number, what percentage one number is of another, and percentage change. Discount Calculator shows both the saving and sale price. Days Between Dates Calculator counts calendar days between two selected dates.
Each result shows the input relationship it used, so you can check the answer rather than treating the page as a black box. These tools are intended for quick estimates and planning; they are not financial, tax, payroll, legal-deadline or medical advice. Use the original source or a qualified professional where an official calculation matters.
Discount Calculator
Work out a sale price and savings from a percentage discount.
Open ToolDays Between Dates Calculator
Find calendar days and weeks between two selected dates.
Open ToolCalculators FAQ
Do the calculators use my data?
No. The calculations run in your browser tab. The values you enter are not sent to Synthixx servers.
Are calculator results exact?
They apply the stated mathematical formula to the values you enter. Rounding is only used for display, but specialised rules for tax, finance, payroll or legal dates can differ.
How does the date calculator count days?
It compares UTC calendar dates, so daylight-saving changes do not alter the result. Choose the inclusive option if both selected dates should be counted.