Calculators
20 Free Online Calculators for Math, Finance and Health
Published June 7, 2026 · 5 min read
Free online calculators save time on tasks you'd otherwise need a spreadsheet or a formula reference for. Whether you're working out a mortgage, checking your BMI, planning savings, or splitting a restaurant bill, the right calculator gives you an instant answer with no sign-up and no app to download.
Below are 20 free calculators on Nutilz, grouped by use case, with a note on what each one does and when you'd reach for it.
Finance Calculators
Loan & EMI Calculator — Enter the principal, interest rate and loan term to get your monthly EMI, total interest paid and a full amortization table. Useful for mortgages, car loans and personal loans.
Compound Interest Calculator — Shows how an investment grows over time with compound interest and optional monthly contributions. Adjust frequency (daily, monthly, annually) to compare savings accounts and investment accounts.
Savings Goal Calculator — Enter your target amount, current savings and interest rate to find either how long it will take or what monthly deposit is needed to hit your goal.
Discount Calculator — Works in both directions: enter original price and discount percentage to get the sale price, or enter two prices to find the discount percentage.
VAT Calculator — Add or remove VAT, GST or sales tax from any price for any tax rate. Supports both tax-inclusive and tax-exclusive calculations.
Tip Calculator — Calculate the tip on a bill and split the total between any number of people.
Health Calculators
BMI Calculator — Calculate Body Mass Index using height and weight (metric or imperial) and see which health category the result falls into.
Age Calculator — Find your exact age in years, months, days and hours. Also shows total days lived, total hours and days until the next birthday.
Math & Conversion Calculators
Percentage Calculator — Covers all percentage problems: what is X% of Y, what percentage is X of Y, and percentage increase/decrease.
Statistics Calculator — Paste a dataset to get mean, median, mode, range, variance and standard deviation instantly.
Unit Converter — Convert between units of length, weight, temperature, area and speed. Covers both metric and imperial systems.
File Size Converter — Convert between bytes, KB, MB, GB and TB in both decimal (base 10) and binary (base 2) units.
Aspect Ratio Calculator — Enter two dimensions to find the aspect ratio, or enter a ratio and one dimension to calculate the other. Useful for video, image and screen work.
Random Number Generator — Generate one or many random integers or decimals in any range, with an option to prevent duplicates.
Roman Numerals Converter — Convert any Arabic number to Roman numerals and back, with a step-by-step breakdown of the conversion.
Number to Words Converter — Convert any number to English words in plain, ordinal or currency format. Useful for writing checks or legal documents.
Date & Time Calculators
Date Calculator — Find the number of days between two dates, or add/subtract days, weeks, months and years from a date.
Timezone Converter — Convert a specific time between any two time zones and see the current time in cities worldwide.
Education Calculators
GPA Calculator — Enter course grades and credit hours to calculate your weighted GPA on a 4.0 scale.
Fuel Cost Calculator — Calculate the fuel cost of a road trip in MPG or L/100km, with an option to split costs between passengers.
All in One Place
All 20 calculators are free, run entirely in the browser and require no sign-up. Visit the Calculators hub to browse the full list, or use the search bar on the Nutilz homepage to find any tool instantly.