Free Online Calculators
The largest section on the site, and the one people return to. Financial calculators here show the working rather than a single number: the mortgage calculator gives a full amortisation schedule so you can see how little of an early payment touches the principal, the debt payoff calculator compares avalanche and snowball side by side with the actual interest cost of choosing the psychologically easier one, and the rent-versus-buy calculator accounts for maintenance, opportunity cost, and transaction fees rather than just comparing rent to a mortgage payment. Alongside those sit the everyday ones — percentage, tip, age, date difference, BMI, GPA — that you need once and want answered without a page of ads first.
All 25 Calculators
Personal Loan Calculator
Calculate personal loan payments, interest, and credit score impacts.
Age Calculator
Calculate exact age in years, months, days, hours, minutes. Birthday countdown and age-difference mode.
Unit Converter
Convert length, weight, temperature, area, volume, speed, time, and data units with every result shown at once.
Percentage Calculator
Find X% of Y, percentage change, increase, decrease, and reverse percentage — with formulas shown.
Random Number Generator
Generate cryptographically secure random numbers, roll dice, flip coins.
BMI Calculator
Calculate BMI in metric (kg/cm) or imperial (lb/ft). Visual category scale, healthy range by age.
Tip Calculator
Calculate tips and split bills instantly. Choose tip percentage, divide among friends, see per-person totals with round up option.
Salary Calculator
Convert salary between hourly, weekly, biweekly, monthly & annual. Estimate take-home pay after taxes.
GPA Calculator
Calculate semester and cumulative GPA on a 4.0 scale.
Discount Calculator
Calculate sale prices, savings, and double discounts instantly.
Date Calculator
Calculate days between dates or add/subtract days from any date.
Compound Interest Calculator
Project savings growth with daily, monthly, or yearly compounding and recurring contributions. Visual chart.
Loan Calculator
Calculate monthly payments, see full amortization, and model extra payments. Export CSV / PDF / Excel.
Debt Payoff Calculator
Compare Snowball vs. Avalanche strategies to find the fastest, cheapest way to pay off your debts.
Mortgage Calculator
Calculate monthly mortgage payments with principal, interest, taxes, PMI, insurance & HOA. Free amortization schedule and loan comparison.
ROI Calculator
Calculate return on investment instantly. Compare investments, see annualized returns, analyze marketing ROI.
Profit Margin Calculator
Calculate profit margin, markup %, and net profit instantly. Convert margin to markup, find break-even revenue.
VAT Calculator
Add or remove VAT from any price. Pre-loaded rates for 40+ countries including UK, EU. Reverse VAT calculation.
Home Affordability Calculator
Calculate how much home you can afford based on income, debts, and the 28/36 rule. See monthly payment breakdown with taxes, insurance, and PMI.
Mortgage Refinance Calculator
Compare current vs. new mortgage, calculate break-even point, monthly savings, and lifetime cost impact of refinancing.
Auto Loan Calculator
Calculate your car payment with credit score-based rates, trade-in, down payment, and sales tax. New and used car support.
Retirement Savings Calculator
Project your retirement savings with compound growth, Social Security, inflation adjustment, and the 4% safe withdrawal rule.
Rent vs. Buy Calculator
Compare the true cost of renting vs. buying a home over time, including equity, taxes, PMI, maintenance, and investment opportunity cost.
Savings Goal Calculator
Find exactly how much to save daily, weekly, or monthly to reach any financial goal with compound interest and inflation adjustment.
Mortgage Payoff Calculator
See how much interest you save and years you cut by paying extra on your mortgage. Compare strategies: extra monthly, bi-weekly, or lump sum.
Why use these calculators
Schedules, not just totals
Loan and mortgage calculators produce a month-by-month amortisation table showing the principal and interest split, so an extra payment’s real effect is visible rather than asserted.
Honest comparisons
Rent-versus-buy, refinance, and debt-payoff calculators include the costs people leave out — closing fees, maintenance, opportunity cost on a down payment — because those are usually what decides the answer.
Your figures stay yours
Salary, debt, and savings numbers are calculated in the page and never sent anywhere. Nothing is stored, so there is no profile being built from what you typed into a mortgage form.
Frequently asked questions
Are these calculators accurate enough to make decisions on?
They use standard financial formulas — the amortisation formula for loans, compound interest for savings — and are accurate for the inputs you give. What they cannot know is your lender’s specific fees, insurance, or local tax treatment. Treat the output as a solid estimate for comparing options, and confirm exact figures with the lender before signing.
Is what I type into a salary or debt calculator recorded?
No. All arithmetic runs in your browser and nothing is transmitted or saved. Reload the page and every field is empty again. There is no account, no cookie storing your income, and no lead form disguised as a results page.
What is the difference between the avalanche and snowball methods?
Avalanche pays the highest interest rate first and always costs less overall. Snowball pays the smallest balance first, which clears individual debts sooner and keeps motivation up. The debt payoff calculator runs both on your actual balances and shows the difference in total interest, so you can decide whether the motivational advantage is worth the cost.