Free Finance Calculators
Free online finance calculators: meeting cost, freelancer hourly rate, loan payoff with extra payments, FIRE retirement number, and US CPI inflation. No account needed.
Five free financial calculators covering the numbers people reach for most often — the real cost of meetings, a sustainable freelancer rate, loan payoff schedules, the FIRE retirement number, and US dollar inflation using CPI data. Every tool runs in your browser with no account required.
Whether you want to know how much a recurring meeting costs your company, how many years until you can retire early, or what $10,000 in 1990 is worth today, these calculators give you a precise answer without any sign up.
About each calculator
Meeting cost calculator
The meeting cost calculator turns an abstract block in the calendar into a real dollar figure. Enter the number of attendees and an average annual salary, and the counter starts when you click start — showing exactly what that time costs as it elapses. The calculation uses a simple hourly rate model: annual salary divided by 2,080 working hours, multiplied by attendees and elapsed time. You can pause and reset at any point.
This tool is most useful for raising awareness about meeting culture in an organisation. A 45-minute standup with 12 engineers at $120,000 per year costs over $400 each time it runs. A weekly sync at that cost adds up to more than $20,000 a year. Seeing the number tick up in real time makes the cost concrete in a way that a spreadsheet estimate does not.
Freelancer hourly rate calculator
The freelancer rate calculator works backwards from what you need to earn. Enter your target annual income, annual business expenses, billable hours per week, and effective tax rate — the calculator outputs the minimum hourly rate you must charge to cover everything and still take home your target. It accounts for the reality that freelancers rarely bill 40 hours per week: some hours go to admin, sales, invoicing, and downtime between contracts.
Many freelancers underprice because they compare their hourly rate to a salaried colleague's wage and forget that they pay all their own taxes, health insurance, equipment, software, and retirement contributions. A freelancer earning $80/hour may take home less than an employee at $55/hour once all costs are included. This calculator makes that comparison explicit so you can set a rate that actually works.
Loan payoff calculator with extra payments
The loan payoff calculator shows your standard amortisation schedule and then recalculates it with any extra monthly payment you choose. It displays the new payoff date, the total interest saved, and the number of months cut from the loan term. It works for any fixed-rate loan — mortgage, car loan, student loan, or personal loan. You can try different extra payment amounts and immediately see how each one changes the outcome.
The mathematics of extra payments is non-intuitive: an extra $200 per month on a 30-year mortgage at 7% does not reduce the term by a neat fraction — it can cut 5 or more years off the loan and save tens of thousands in interest, because each early payment reduces the principal on which future interest is charged.
FIRE number calculator
The FIRE number calculator estimates how much you need to save before you can retire, based on your expected annual spending and a chosen safe withdrawal rate. The standard approach uses the 4% rule derived from the Trinity Study: a portfolio invested in a mix of stocks and bonds has historically sustained a 4% annual withdrawal indefinitely. Your FIRE number is therefore 25 times your annual expenses.
The 4% rule is a rule of thumb, not a guarantee. Some FIRE practitioners use a 3% or 3.5% withdrawal rate for early retirement, which raises the target to 33x or 28x expenses respectively. The calculator lets you adjust the withdrawal rate so you can compare targets under different assumptions.
US CPI inflation calculator
The inflation calculator converts a dollar amount from one year to its equivalent in another year using the US Bureau of Labor Statistics Consumer Price Index (CPI). Enter a dollar amount, a starting year, and an ending year — the calculator returns the equivalent value adjusted for cumulative inflation or deflation.
CPI measures price changes across a fixed basket of consumer goods and services, making it the standard reference for measuring purchasing power changes over time. Common uses include understanding how much salaries have changed in real terms, comparing historical prices to today, and calculating real returns on investments.
Which calculator to use
For most financial questions, pick the tool that matches what you already know. Wondering whether a meeting is worth everyone's time? Use the meeting cost calculator and start the timer. Setting a freelance rate? Enter your expenses and income target in the freelancer rate calculator. Trying to pay off debt faster? The loan payoff calculator shows exactly how much interest extra payments will save.
For longer-term questions, the FIRE number and inflation calculators work well together. Use the FIRE calculator to set a savings target based on today's spending, then use the inflation calculator to understand how much that spending might rise in real terms by the time you retire.
How to use these calculators well
Every finance calculator depends on assumptions. A meeting cost estimate depends on average salary and whether benefits or overhead are included. A freelancer rate depends on realistic billable hours, taxes, and downtime. A loan payoff projection assumes a fixed rate and that extra payments are actually applied to principal. A FIRE estimate depends heavily on future spending and a withdrawal rate that may or may not fit your retirement horizon.
That does not make the tools less useful; it means the best way to use them is comparatively. Try a conservative case, a likely case, and an aggressive case. If the answer stays roughly the same across all three, you probably understand the range well enough to make a decision.
Frequently asked questions
What is the CPI inflation calculator?
The CPI inflation calculator converts a dollar amount from one year to its equivalent in another year using the US Consumer Price Index published by the Bureau of Labor Statistics. Enter a dollar amount, a start year, and an end year — the result shows how much purchasing power has changed over that period. It is the standard tool for comparing prices, wages, or investment returns across different years in real (inflation-adjusted) terms.
How do I use the CPI price calculator to compare past and present prices?
Enter the original dollar amount and the year it came from, then select the year you want to compare to — usually the current year. The calculator applies the cumulative CPI change between those years and returns the equivalent amount. For example, $1,000 in 1990 is equivalent to roughly $2,400 in 2024 using CPI, meaning prices roughly doubled over that period.
What is the FIRE number?
The FIRE number is the total amount of invested assets you need to retire and live off investment returns without working. It is calculated by multiplying your expected annual spending by 25, which is equivalent to a 4% annual withdrawal rate. A person spending $50,000 per year needs a FIRE number of $1.25 million. The 4% figure comes from historical research showing that a diversified portfolio has sustained that withdrawal rate for at least 30 years.
Is the 4% rule safe for early retirement?
The 4% rule was derived from studies of 30-year retirement periods. For early retirement lasting 40 to 50 years, many FIRE practitioners prefer a 3% or 3.5% withdrawal rate, which means saving 33x or 28x annual expenses instead of 25x. The FIRE calculator lets you set any withdrawal rate so you can see how the target changes under more conservative assumptions.
How does the loan payoff calculator work?
Enter your loan balance, interest rate, and monthly payment. The calculator builds a full amortisation schedule showing when the loan is paid off and total interest paid. Then add any extra monthly payment and the schedule recalculates instantly — showing the new payoff date, months saved, and total interest saved. It works for any fixed-rate loan: mortgage, car loan, student loan, or personal loan.
How much interest can extra loan payments save?
The savings depend on the loan size, rate, and how early you start making extra payments. As a rough example, on a $300,000 30-year mortgage at 7%, an extra $300 per month from the start can save over $100,000 in interest and pay the loan off roughly 8 years early. The reason is that each extra payment reduces principal, which lowers the interest charged in every subsequent month.
How do I calculate a freelancer hourly rate?
Enter your target annual take-home income, annual business expenses (software, equipment, insurance, etc.), the number of billable hours you realistically work each week, and your effective tax rate. The calculator divides your total required revenue — income plus expenses plus tax — by annual billable hours to find the minimum rate you must charge. Most freelancers bill fewer than 40 hours per week once admin, sales, and downtime are accounted for.
Why do freelancers need a higher hourly rate than salaried employees?
A salaried employee's cost to the employer includes salary, payroll taxes, benefits, equipment, and overhead — the employee only sees the net salary. A freelancer must charge enough to cover all those same costs themselves: self-employment taxes (both halves of Social Security and Medicare in the US), health insurance, retirement contributions, equipment, software, and paid time off they fund themselves. This is why a freelancer billing $80/hour may take home less than an employee earning $55/hour.
How does the meeting cost calculator work?
Enter the number of attendees and an average annual salary, then click start. The calculator divides the annual salary by 2,080 working hours to get an hourly rate, multiplies by the number of attendees, and increments the total as time passes. It is a rough estimate — it uses a single average salary and does not account for benefits cost — but it makes the financial weight of meeting time concrete and visible in real time.
What does CPI stand for, and what does it measure?
CPI stands for Consumer Price Index. It is a measure of the average change in prices paid by urban consumers for a fixed basket of goods and services, including food, housing, apparel, transportation, medical care, recreation, and education. The US CPI is calculated and published monthly by the Bureau of Labor Statistics. It is the most widely used measure of inflation in the United States.
What is the difference between nominal and real value?
A nominal value is expressed in the dollars of a specific year without adjusting for inflation. A real value is adjusted for inflation so that amounts from different years can be fairly compared. For example, a salary of $50,000 in 2000 and $70,000 in 2024 may represent less purchasing power in 2024 once CPI inflation is applied. The inflation calculator converts between nominal and real values using CPI data.
Do these calculators require an account or sign up?
No. All five calculators run entirely in your browser. No account, no email, no sign up is required. Nothing is sent to a server — your inputs stay on your device.
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