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116+ free calculators

Life is complicated enough

Calculations shouldn't be.

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Most popular calculators

Rent Calculator

Enter your income, debts, and utilities to see how much rent actually fits your budget. open

YouTube Money Calculator

Plug in your views and CPM to see roughly what a channel earns per day, month, and year. open

Sales Tax Calculator

Enter the price and tax rate to get the exact tax amount and final cost, whether or not tax is already included. open

Ovulation Calculator

Enter your cycle length and last period to find your likely fertile window. open

APY Calculator

Enter your deposit, rate, and compounding frequency to see what it actually grows to over time. open

VAT Calculator

Add or remove VAT from any amount — enter the rate and price, get the tax total instantly. open

Car Custom Duty Calculator

Estimate the total import duty, levy, and taxes on a vehicle before committing to import it into Nigeria. open

Interest Rate Calculator

Work out the interest rate on a loan from the amount, term, and monthly payment. open

Herbicide Calculator

Work out how much herbicide your sprayer actually needs, based on tank size and rate. open

Fat Intake Calculator

Enter your weight and activity level to see a reasonable daily fat target. open

Coffee Calculator

Check how much caffeine is safe for your body weight before your next cup. open

Age Calculator

Enter a birthdate to get an exact age in years, months, weeks, days, hours, and seconds. open

New Year Countdown

See exactly how much time is left until midnight on January 1st. open

Percentage Calculator

Work out percentages, increases, and decreases without doing the math by hand. open

Age Difference Calculator

Enter two birthdates to see the exact gap between them, down to the day. open

CD Calculator

Enter your deposit, rate, term, and compounding to see what a CD actually pays out, after tax. open

ROI Calculator

Enter what you put in and what you got back to see your actual return. open

CGPA Calculator

Built for Nigerian students — enter your grades and credit units to track your CGPA properly. open
Illustration of scattered papers and charts representing calculation chaos

One place, not ten tabs

I built Calclulo because I got tired of googling a different calculator every time I needed one — a tip calculator here, a BMI one there, some ad-choked site for loan interest. This puts them all in one place instead.

Every tool shows its formula, not just a number with no explanation behind it. No account required, no paywall on the ones that matter — pick what you need and go.