Fast, private, English-first tools

Everyday calculators that answer in seconds.

Use practical calculators for percentages, discounts, units, BMI, calories, age, dates, loans, mortgages, savings, fractions, cooking, and GPA. Everything runs instantly in your browser.

Start calculating Explore tools

Must-have

Percentage Calculator

Math

15% of 200 is 30.

Formula: percentage value = number x percent / 100

Calculator collection

Useful tools without accounts or external APIs

Pick a calculator, enter the values, and get the answer immediately. The tools are grouped around everyday math, finance, health, dates, school, and kitchen conversions.

Shopping

Discount Calculator

$120 with 25% off is $90.

Search intents: discount calculator, 20 percent off, sale price calculator.

Converters

Unit Converter

Units

10 cm = 3.937 in.

Popular pages later: cm to inches, kg to lbs, Celsius to Fahrenheit.

Health

BMI Calculator

BMI

BMI is 24.7, which is in the normal range.

BMI is a screening measure, not medical advice.

Time

Age Calculator

Date

Age: 36 years, 5 months, 29 days.

Useful long-tail: age calculator, days between dates, date calculator.

Finance

Loan Calculator

APR

Monthly payment: $489.15. Total interest: $4,349.04.

Formula uses a standard fixed-rate amortizing loan payment.

Finance

Mortgage Calculator

Home

Monthly payment: $1,724.07.

Principal and interest estimate only. Taxes, insurance, and local fees are not included.

Savings

Compound Interest

Future value: $52,786.18.

Supports recurring monthly contributions and monthly compounding.

Time

Days Between Dates

Days

There are 30 days between the selected dates.

Useful for project planning, travel countdowns, subscriptions, and deadline checks.

Health

Calorie Calculator

TDEE

BMR: 1,780 calories. Maintenance: 2,759 calories/day.

Uses the Mifflin-St Jeor BMR equation and an activity multiplier.

Math

Fraction Calculator

a/b

1/2 + 1/4 = 3/4.

Adds, subtracts, multiplies, divides, and simplifies fractions.

Everyday

Cooking Converter

Kitchen

2 cups = 473.176 ml.

Kitchen conversions use common US cooking measures.

School

GPA Calculator

4.0

Weighted GPA: 3.72.

Enter grade points on a 0.0 to 4.0 scale and the credit value for each class.