81 free calculators — no sign-up, runs in your browser
Calculate anything. Instantly.
Free online calculators for money, math, health, dates, conversions and more — fast, private and mobile-friendly.
Popular calculators
The tools people reach for most.
Mortgage Calculator
Estimate monthly mortgage payments including principal, interest, taxes and insurance for any home price.
Loan Calculator
Work out the monthly payment, total interest and total repayment for any personal or business loan.
Compound Interest Calculator
Watch money grow with compounding — add regular contributions and choose any compounding frequency.
Credit Card Payoff Calculator
See how long a credit card balance takes to clear at your payment level and what you'll pay in interest.
Tip Calculator
Tip and total per person for any bill — split evenly among any group size.
BMI Calculator
Body Mass Index in metric or imperial units, with WHO category and healthy weight range for your height.
BMR Calculator
Basal Metabolic Rate via the Mifflin-St Jeor equation — the calories your body burns at complete rest.
TDEE Calculator
Total Daily Energy Expenditure: your full-day calorie burn based on BMR and activity level.
Calorie Calculator
Daily calorie targets for losing, maintaining or gaining weight based on your goal pace.
Macro Calculator
Protein, carb and fat gram targets matched to your calories and preferred macro split.
One Rep Max Calculator
Estimate your 1RM from a rep max set, plus percentage-based training loads.
Percentage Calculator
Calculate X% of Y, find what percent one number is of another, and solve percentage increase problems in one place.
Explore by category
Financial
Loans, savings, investing & pay
Math
Percentages, fractions & powers
Health
BMI, calories & body metrics
Fitness
Pace, training & performance
Time & Date
Ages, durations & countdowns
Conversion
Units, currency & measurements
Education
Grades, GPA & study tools
Business
Margins, CAC, LTV & ads
Construction
Concrete, paint, tiles & more
Statistics
Averages & spread
Everyday
Tips, fuel, cooking & life admin
Recently added
View all →Fuel Cost Calculator
Trip fuel cost from distance, efficiency and gas price — for one-way or round trips.
Pace Calculator
Running pace per km or mile from distance and finish time — plus speed in km/h or mph.
Salary to Hourly Calculator
Convert an annual salary into its hourly, weekly and monthly equivalents.
Hourly to Salary Calculator
See the annual, monthly and weekly salary equivalent of your hourly rate.
GPA Calculator
Weighted GPA from letter grades and credit hours on the 4.0 scale.
Grade Calculator
Current class grade from assignment scores and their category weights.
Break-Even Calculator
Units and revenue needed to break even from fixed costs, variable cost and price.
Commission Calculator
Commission earnings from sales amount and rate, including base-plus-commission structures.
Why Ultimate Calculator Hub?
Every calculator on this site runs entirely in your browser — your numbers are never uploaded, stored or shared. Results appear instantly, work offline once loaded, and each tool explains the formula behind the math so you can check every step.
From mortgage payments and compound interest to BMI, macro splits, concrete volumes and unit conversions, our 81 calculators cover finance, health, math, time & date, construction and everyday questions — completely free.