Tools & Planning
Practical calculators for percentage math, work and business planning, and everyday decision support.
Percentage & Change
Discount Calculator
Calculate markdowns and sale prices for discounts.
Fraction to Percent Calculator
Convert a fraction to a percentage value.
Margin Calculator
Calculate margin and markup from cost and revenue values.
Margin vs Markup Calculator
Compare margin and markup from selling price and cost.
Markup Calculator
Calculate selling price and margin from cost and markup.
Markup Percentage Calculator
Calculate markup percentage from cost and selling price.
Percent Change Calculator
Calculate percent change from an old value to a new value.
Percent Difference Calculator
Calculate percent difference between two values.
Percent Error Calculator
Calculate percent error between measured and true values.
Percent to Fraction Calculator
Convert percent values into simplified fractions.
Percentage Calculator
Calculate percentages, ratios, and percentage-based values quickly.
Percentage Decrease Calculator
Find percentage decrease between two values.
Percentage Increase Calculator
Find percentage increase between two values.
Percentage of a Number Calculator
Find a percentage value of any number instantly.
Profit Margin Calculator
Calculate profit amount and margin percentage from revenue and cost.
What Percent of X is Y Calculator
Calculate what percentage one value is of another value.
Work & Business Time
Business Days Calculator
Count weekdays between two dates.
Countdown Calculator
Show time remaining until a target date and time.
Days Until Calculator
Calculate number of days from today (or custom start) until a target date.
Hours to Days Calculator
Convert hours to equivalent days and remaining hours.
Hours Worked Calculator
Calculate total hours worked based on start/end times and break length.
Months Between Dates Calculator
Calculate complete and fractional months between two dates.
Time Card Calculator
Calculate total worked time from clock-in and clock-out values.
Time Zone Converter
Convert date and time values across UTC offsets.
Week Number Calculator
Get ISO week numbers for any date.
Work Hours Calculator
Calculate total worked time across days and shifts.
Workdays Between Dates Calculator
Count weekdays between two dates (Monday through Friday).
Cost of Living & Planning
Age in Days Calculator
Calculate exact age in days from date of birth to today.
Age in Months Calculator
Calculate age in complete months between two dates.
Budget Calculator
Plan monthly cash flow with income and expense categories.
Climbing Grade Converter
Convert climbing grades between major scales.
Cost of Living Calculator
Estimate household expenses by category and compare scenarios.
Date Difference Calculator
Calculate difference between dates.
Emergency Fund Calculator
Estimate a target emergency savings balance.
Inflation Adjusted Return Calculator
Convert nominal investment return to real (inflation-adjusted) return.
Sales Tax Calculator
Calculate total with tax and pre-tax amount from sales tax rate.
Terms Calculator
Calculate terms and durations.
Time Calculator
General time calculator.
Time Duration Calculator
Calculate duration between times.
Unit Price Calculator
Calculate price per unit from total price and quantity.