Monthly payment, total interest, amortisation schedule, PMI, and extra payments
Personal, auto, and student loans — monthly payment, true APR, and amortisation
Compare multiple loan offers side-by-side — rate, term, and total cost
Investment growth with contributions, inflation adjustment, tax drag, and year-by-year breakdown
401k, IRA, and nest-egg planner with inflation and Social Security
How long to pay off, minimum payment trap, and payoff strategies
Compare payoff strategies across multiple debts
Estimate which bankruptcy chapter may apply and potential debt discharge
ROI, annualised return, and payback period calculator
How much to save monthly to reach any financial target
Track income and expenses to build a monthly budget
Total assets minus liabilities — your complete financial picture
Convert between world currencies with live rates
Units and revenue needed to break even — fixed vs variable costs
Body mass index with health classification, ideal weight, and TDEE
TDEE, BMR, and calorie targets for weight loss, maintenance, and gain
Estimate body fat percentage using Navy method and BMI method
Healthy weight range using Devine, Robinson, Miller, and Hamwi formulas
Calculate due date by LMP, conception date, or ultrasound
Estimate fertile window and ovulation date from cycle length
Understand your blood pressure reading and category
Estimate blood alcohol content based on drinks, weight, and time
Daily water needs based on weight, activity, and climate
Optimal bedtime and wake time based on sleep cycles
Calculate your 1RM from any rep range using 6 proven formulas
Protein, carbs, and fat targets for your goal and body type
Pace, speed, and finish time for any race distance
Calories burned for 55 activities based on your weight and duration
Estimate your aerobic fitness level from exercise data
Target heart rate zones for fat burn, cardio, and peak training
What is X% of Y, percentage change, and percentage difference
Add, subtract, multiply, and divide fractions — with simplification
Area of circles, rectangles, triangles, and irregular shapes
Volume of common 3D shapes with unit conversion
Simplify ratios, solve proportions, and scale ratios
Convert to and from scientific notation with full working
Check if a number is prime and find prime factors
Greatest common factor and least common multiple for any numbers
Solve quadratic equations — real and complex roots with steps
Gross, operating, and net profit margin with markup conversion
Calculate markup percentage, selling price, and profit from cost
Add or remove tax from any amount — multiple tax rates
Build invoices with line items, tax, discounts, and totals
Estimate take-home pay after federal, state, and FICA taxes
Return on investment, annualised ROI, and payback period
Units and revenue needed to break even — fixed vs variable costs
True cost of an employee including taxes, benefits, and overhead
Monthly and annual recurring revenue, churn, and LTV
Calculate tip, split bills, and per-person totals — including tax
Split a bill evenly or by item among any number of people
Exact age in years, months, and days — plus next birthday countdown
Days, weeks, and months between any two dates
Convert times between any two time zones worldwide
Trip fuel cost, miles per gallon, and cost per mile
Monthly electricity cost for any appliance or device
Convert length, weight, temperature, volume, and more
Calculate GPA on 4.0 or 5.0 scale from letter grades and credits
How much paint you need for any room or surface area
Concrete volume needed for slabs, footings, and columns
Voltage, current, resistance, and power — solve for any variable
Mass, volume, and density — all unit combinations
Solve for any variable — mph, km/h, m/s, knots, Mach and more
Radioactive decay and remaining quantity after any period
Convert between wavelength, frequency, and wave speed
CalcHub provides 63 free online calculators built to give you accurate, intelligent results immediately — no sign-up, no ads cluttering the results, no paywalls. Every calculator is designed to be genuinely useful: smart defaults, meaningful output explanations, and clear breakdowns of how the answer was calculated.
Our finance calculators go beyond simple formulas. The mortgage calculator includes property tax, insurance, PMI, and shows your full amortisation schedule. The compound interest calculator adjusts for inflation and tax drag. The loan calculator computes your true APR including fees.
The BMI calculator goes beyond a single number — it shows your ideal weight range, calorie targets for weight change, and uses the scientifically validated Mifflin-St Jeor equation for TDEE. Health calculators include both metric and imperial units.
Need to convert kg to lbs, Celsius to Fahrenheit, or cm to feet and inches? Our unit converters cover weight, temperature, length, volume, and speed — with dedicated longtail pages for the most-searched conversions like 5'10" in cm, 100 kg to lbs, and 350°F to Celsius.
Yes. All 63 calculators are completely free, forever. No account required, no premium tier, no usage limits.
Our calculators use industry-standard financial formulas and validated health equations (Mifflin-St Jeor for BMR, standard amortisation for loans and mortgages). Results are for informational purposes — always verify important financial decisions with a qualified advisor.
We are adding new calculators regularly. All 63 planned calculators are listed on this page — those marked "Soon" will be live within coming weeks.