Health Calculators
BMI, calories, pregnancy and more
BMI Calculator
Calculate Body Mass Index for adults. Metric and imperial units.
Pregnancy Due Date
Estimated due date, trimester tracker and pregnancy milestones.
Calorie Calculator
Daily calorie needs based on age, weight, height and activity level.
Steps to Miles
Convert step count to miles or kilometres based on your stride length.
Miles to Steps
Convert a distance in miles or km to an approximate step count.
Finance Calculators
Savings, interest, mortgages, debt and investing
Compound Interest
See how your savings grow over time with compound interest and a growth chart.
Mortgage Calculator
Monthly payment, total interest, and full amortization schedule for any home loan.
ROI Calculator
Return on investment, annualized ROI, after-tax return, and investment comparison.
Inflation Calculator
Calculate purchasing power loss and the real cost of inflation over any period.
Savings Goal
How much to save monthly to reach your financial target, with optional interest.
Debt Payoff
Time and total cost to pay off any loan or credit card debt.
Hourly to Salary
Convert hourly wage to annual, monthly, or weekly salary — and back.
Cooking Calculators
Recipe scaling, conversions and temperatures
Recipe Scaler
Scale any recipe up or down to any number of servings instantly.
Cups to Grams
Convert cups to grams for 50+ common cooking ingredients.
Grams to Cups
Convert grams to cups for baking and cooking ingredients.
Oven Temperature
Convert oven temperatures between Celsius, Fahrenheit and Gas Mark.
Cooking Converter
Convert between all cooking volume units — ml, cups, tablespoons, teaspoons.
Daily Calculators
Age, tips, percentages and dates
Age Calculator
Exact age in years, months, weeks and days from your date of birth.
Tip Calculator
Calculate tip amount and split the bill between any number of people.
Percentage Calculator
Find percentages, percentage change, and what percent one number is of another.
Days Between Dates
Count the number of days, weeks, or months between any two dates.
Unit Converters
Length, weight, temperature and more
Unit Converter
All-in-one converter for length, weight, temperature, volume, speed and area.
Length Converter
Convert between metres, feet, inches, miles, kilometres and more.
Weight Converter
Convert between kilograms, pounds, ounces, stones and tonnes.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin instantly.
Why Calculoos?
Built for everyone — not just for experts. Clean results, no clutter, no sign-up required.
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Instant results
Results update as you type. No page reloads, no waiting.
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3 languages
English, Chinese and Spanish. Metric and imperial units automatically adjusted.
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Clear explanations
Every calculator explains what the result means and how the formula works.