FREE CALCULATORS
Free online calculators with clear results.
Free online calculators for everyday calculations: age, percentages, loans, dates, health metrics and more. Enter your values to get clear results with the formula and steps.
Popular calculators
A selection of frequently used calculators.
Age Calculator
Your exact age in years, months and days — plus totals, birth weekday and a next-birthday countdown.
Date & Time
Dog Age Calculator
Convert dog years to human years with the UCSD epigenetic formula or a size-based breed estimate.
Pets
Date Calculator
Work out the days between two dates, add or subtract days, weeks, months and years, count down to a date, and see the weekday and week number.
Date & Time
Time Calculator
Add up hours and minutes, measure the time between two times including overnight shifts, total a work week with breaks and overtime, and add or subtract time from a clock.
Date & Time
Pregnancy Calculator
Estimate your due date, current week and trimester from the first day of your last period.
Health
BMI Calculator
Body Mass Index with WHO category and healthy weight range for your height.
Health
Percentage Calculator
Three percentage questions in one tool: P% of X, X is what % of Y, X is P% of what.
Math
Tip Calculator
Tip, total and per-person split with quick presets and a visual bill breakdown.
Finance
Compound Interest Calculator
See what compounding itself does to a balance — annual, monthly or daily — and what APY a nominal rate actually pays.
Finance
Loan Calculator
Fixed-rate loan payment, total interest and payoff time — with extra-payment savings.
Finance
Currency Converter
Convert supported world currencies with a free hourly reference feed and resilient daily fallbacks.
Converters
Air Fryer Calculator
Convert conventional oven cooking times and temperatures to air fryer settings.
Kitchen
Browse by category
Browse the calculators by topic.
Math
08Numbers, solved
Percentages, ratios, fractions and statistics with exact arithmetic. Every tool shows its formula so you can check the work yourself.
Date & Time
05Calendar math, solved
Working days, date differences and calendar questions answered the moment you type a date — leap-year accurate.
Finance
20Money math, demystified
Tips, loans, savings and growth projections built on standard formulas. Transparent arithmetic — projections, never financial advice.
Health
09Numbers that care
BMI and pregnancy-cycle estimates based on standard, documented methods — always labelled as estimates, never medical advice.
Pets
04Every age, in human years
Dog and cat age conversion with the actual method stated — UCSD epigenetics for dogs, the accepted veterinary convention for cats.
Converters
10Any unit, any zone, any currency
Convert units, time zones and supported currencies with exact factors, real IANA zones and current reference rates.
Kitchen
05Culinary math, solved
Cups to grams, air fryer conversions, recipe scaling and baking temperatures with tested culinary datasets.
How YouCanCalc works
Formulas you can check
Results show the formula or method used, so you can check the calculation.
Private by default
Calculations run in your browser. Your inputs are not sent to our servers.
Honest estimates
Where a result depends on an assumption or average, the page tells you.