Local browser tool

Calculators

Tip, loan, BMI, ratio, dates & more.

A set of everyday calculators in one place — percentage, tip and bill split, loan & mortgage, compound interest, BMI, daily calories, aspect ratio, date math, and exact age in years, months and days. Pick a calculator. Everything runs in your browser; nothing is uploaded.

Open the tool Browse all tools

Processes your input on your device without uploading it. Libraries or models may need downloading. No site account is required.

At a glance

Processing: Local browser tool
Cost and account: Free; no site account needed.
Version: v1.3.0
Last updated: October 16, 2026

Included tools

Each task has its own guide, and opens as its own page.

Percentage

X% of Y, X is what % of Y, and percent change.
Open the tool
Tip

Tip and split a bill across any number of people.
Open the tool
Loan & Mortgage

Monthly payment, total interest, and total cost.
Open the tool
Compound Interest

See savings grow from deposits and compounding.
Open the tool
BMI

Body Mass Index with the WHO category scale.
Open the tool
Calorie

Daily calorie needs (BMR & TDEE), loss/gain.
Open the tool
Aspect Ratio

Resize by a locked ratio; simplify any size.
Open the tool
Date & Age

Duration between dates, and exact age.
Open the tool
Age

Exact age, days lived and the next birthday.
Open the tool

Calculators

At a glance

Included tools

Percentage

Tip

Loan & Mortgage

Compound Interest

BMI

Calorie

Aspect Ratio

Date & Age

Age