Calculators
Add & subtract days
Add or subtract calendar days, weeks, months and years from a date.
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Calculators
Age Calculator
Calculate age in years, months and days, total days and your next birthday.
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Aspect Ratio Calculator
Find exact ratios and proportional dimensions with clear pixel rounding.
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Business Days Calculator
Count working days or add and subtract business days with custom weekdays and holidays.
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Countdown to Date
Watch a live countdown to a date and time, with local, UTC or explicit-offset targets.
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Date Difference Calculator
Count exact calendar days and weeks between two dates, with signed and inclusive options.
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Days Until Calculator
Count calendar days until or since a date, with inclusive counting and weeks plus days.
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Fraction Calculator
Add, subtract, multiply, divide and simplify fractions with exact results and steps.
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Golden Ratio Calculator
Split a length using phi, find matching dimensions and compare rounded pixel layouts.
Open Golden Ratio CalculatorCalculators
Percentage Calculator
Find percentages, compare values, or add and subtract a percentage with the formula explained.
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Random number generator
Generate integers or exact decimals in a range, with optional unique results.
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Ratio Calculator
Simplify ratios, scale equivalent pairs and find a missing value with exact arithmetic.
Open Ratio CalculatorCalculators
Rounding Calculator
Round exact decimals to decimal places, significant figures or an increment, with explicit tie rules.
Open Rounding CalculatorCalculators
Scientific Calculator
Calculate expressions, powers and trigonometry with degrees, radians and local history.
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Weighted Average Calculator
Calculate a weighted mean with totals and each value’s contribution.
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