# Free Online Calculators

The formulas you can't keep in your head.

URL: https://shortformkit.com/calculators/
Updated: 2026-10-13

- [BMI Calculator](https://shortformkit.com/bmi-calculator/)
Your body mass index in two seconds, with the WHO ranges.
- [Body Fat Calculator](https://shortformkit.com/body-fat-calculator/)
Estimate body fat with just a tape measure.
- [Calorie Calculator](https://shortformkit.com/calorie-calculator/)
How many calories you burn in a day, and how many to eat to lose weight.
- [Water Intake Calculator](https://shortformkit.com/water-intake-calculator/)
A daily water target that fits your body weight and training.
- [Ideal Weight Calculator](https://shortformkit.com/ideal-weight-calculator/)
A target weight for your height, two ways.
- [Pace Calculator](https://shortformkit.com/pace-calculator/)
Turn any finish time into pace and speed.
- [Race Time Predictor](https://shortformkit.com/race-time-predictor/)
From your last race to your next goal.
- [VO2max Calculator](https://shortformkit.com/vo2max-calculator/)
Estimate your aerobic fitness two ways.
- [Heart Rate Zone Calculator](https://shortformkit.com/heart-rate-zone-calculator/)
Know which pulse is easy, tempo or hard for you.
- [Calories Burned Calculator](https://shortformkit.com/calories-burned-calculator/)
Roughly how much energy a workout costs.
- [Compound Interest Calculator](https://shortformkit.com/compound-interest-calculator/)
Watch interest earn interest.
- [Loan Calculator](https://shortformkit.com/loan-calculator/)
What a loan really costs per month and in total.
- [Percentage Calculator](https://shortformkit.com/percentage-calculator/)
Every common percentage question in one place.
- [Discount Calculator](https://shortformkit.com/discount-calculator/)
What you actually pay in a sale.
- [VAT Calculator](https://shortformkit.com/vat-calculator/)
Net, tax and gross in one step.
- [Tip Calculator](https://shortformkit.com/tip-calculator/)
Tip and split the bill in seconds.
- [Inflation Calculator](https://shortformkit.com/inflation-calculator/)
How inflation eats into money over the years.
- [Hourly to Salary Calculator](https://shortformkit.com/hourly-to-salary-calculator/)
From hourly rate to yearly income.
- [Age Calculator](https://shortformkit.com/age-calculator/)
Your exact age, down to the day.
- [Days Between Dates](https://shortformkit.com/days-between-dates/)
How many days until, or since, a date.
- [Fuel Consumption Calculator](https://shortformkit.com/fuel-consumption-calculator/)
What your car really uses.

Source: Shortform Kit (https://shortformkit.com/calculators/). Free, no login.