Know what you'll actually keep.
Fifty-three free calculators that answer one question each, from marketplace fees and mortgage payments to paint cans and calories. No sign-up, no fluff, just the number and how it was worked out.
Reselling
All reselling calculatorseBay fee calculator
Enter what the item sold for and what the buyer paid for shipping to see every eBay fee and what reaches your payout.
Poshmark fee calculator
Enter the sale price to see Poshmark's cut and your earnings, or flip the mode to find the price that nets an exact amount.
Mercari fee calculator
Enter the sale price to see Mercari's selling fee and what you keep, or flip the mode to find the price that nets an exact amount.
Depop fee calculator
Enter the sale price to see Depop's processing fee, any boost fee, and what you keep. US sellers pay no selling fee.
PayPal fee calculator
Enter what the buyer pays to see PayPal's fee and what you actually keep, or flip the mode to find what to charge for an exact payout.
Stripe fee calculator
Enter the amount you're charging to see Stripe's fee and what you keep, or flip the mode to find what to charge for an exact payout.
Etsy fee calculator
Enter the sale price and what the buyer paid for shipping to see all four Etsy fees and what you keep, or flip the mode to find the price that nets an exact amount.
Whatnot fee calculator
Enter what the item sold for in your live and what the buyer paid for shipping to see both Whatnot fees and what you keep, or flip the mode to find the price you need.
StockX fee calculator
Enter the sale price and your Seller Level to see StockX's transaction and processing fees and your payout, or flip the mode to find the price that nets an exact amount.
Facebook Marketplace fee calculator
Enter the item price and what the buyer paid for shipping and tax to see Facebook's selling fee and your payout, or flip the mode to find the price that nets an exact amount.
Square fee calculator
Enter the amount and how the card was taken to see Square's fee and what lands in your balance, or flip the mode to find what to charge for an exact payout.
Venmo and Cash App fee calculator
Enter the payment and which app took it to see the seller fee and what you keep, or flip the mode to find the amount to ask for so an exact figure reaches you.
Shipping cost calculator
Enter the label price and your packaging cost to see the true cost of a shipment and how much of it the buyer's shipping charge covers.
Reseller profit calculator
Enter what it sold for and what it cost you, pick the platform, and see the profit that actually lands in your pocket.
Break-even resale price calculator
Enter what the item cost you and what you want to make, and get the exact list price that clears every fee.
Profit margin calculator
Enter what an item costs and what it sells for to see the profit, margin and markup, or start from the margin or markup you want and get the price.
Money & Home
All money & home calculatorsMortgage calculator
Enter the price, your down payment and the rate to see the full monthly payment and what the loan costs over its life.
Amortization schedule calculator
Enter the loan, rate and term to get the payment and a year-by-year schedule, then add an extra monthly amount to see how much sooner it's gone.
Refinance calculator
Enter your current balance, rate and years left, then the new offer, to see whether refinancing pays and how soon.
Rent vs buy calculator
Enter your rent and the home you'd buy instead, plus how long you'll stay, to see which costs less once every fee, tax and gain is counted.
Home affordability calculator
Enter your income, debts and down payment to see the most a lender would let you spend and the monthly payment at that price.
Loan payoff calculator
Enter what you owe, the rate and what you pay each month to see when it's gone, and add an extra amount to see the months and interest it saves.
APR calculator
Enter the loan, its rate, term and fees to get the APR: the rate you're really paying once the fees are counted.
Compound interest calculator
Enter a starting amount, a rate and a number of years to see what compounding does, and add a monthly contribution for the real savings picture.
Paycheck calculator
Enter your gross pay and how often you're paid to estimate what lands in your account after federal taxes, FICA and pre-tax deductions.
Freelance tax calculator
Enter your expected profit to see self-employment tax, federal income tax, and the amount to set aside each quarter.
Auto loan calculator
Enter the price, what you're putting down, your rate and the term to see the monthly payment, the interest over the loan and the all-in cost.
Credit card payoff calculator
Enter the balance and APR, then either the amount you pay each month or the deadline you want, to see the payoff time, the payment and the interest.
Savings goal calculator
Enter the amount you're aiming for, what you already have, the time you've got and your savings rate to see what to put away each month.
Hourly to salary calculator
Enter an hourly rate or a yearly salary, along with the hours and weeks you actually work, to see the same pay every way it's quoted.
401(k) match calculator
Enter your salary, the percentage you contribute and your employer's match formula to see the yearly total, the match, and whether you're capturing all of it.
Everyday
All everyday calculatorsCalculator
Type a calculation or tap it in on the keypad. The answer updates as you go, and = puts it back in the box so you can keep going.
Percentage calculator
Pick the question, enter X and Y, and read the answer with the formula used.
Discount calculator
Enter the original price and the discount to see the sale price and what you save, then stack a second coupon or add tax for the checkout total.
Sales tax calculator
Enter a price and pick a state to see the tax and total, or switch the mode to pull the tax out of a price that already includes it.
Unit converter
Enter a value and pick the units for length, weight, kitchen volumes and temperature, using exact definitions rather than rounded approximations.
Age calculator
Enter a date of birth to get an exact age today, or on any date you choose, down to the day.
Date difference calculator
Enter two dates to get the number of days between them, the same span in weeks, months and years, and how many of those days are weekdays.
Fuel cost calculator
Enter the distance, your car's mpg and the local gas price to see what the drive costs, per mile and per person.
Paint coverage calculator
Enter the total length of the walls and their height to see how many gallons a room takes, with doors, windows and a second coat accounted for.
Concrete volume calculator
Enter the slab or footing size to get the concrete in cubic yards and the number of bags, so you know whether to mix it yourself or order a truck.
Recipe scaling calculator
Enter what the recipe makes and what you need, then an ingredient amount, to get the adjusted quantity in measurements you can actually use.
Tip calculator
Enter the bill, pick a tip percentage and say how many people are paying to see the tip, the total and each person's share.
Unit price calculator
Enter the price and quantity of two options in the same unit to see the price per unit for each, which one is the better deal, and the saving.
Mulch, gravel and soil calculator
Enter the bed's length, width and the depth you want, pick the material, and see the cubic yards, the number of bags, the weight and the cost either way.
Flooring calculator
Enter the room size, a waste allowance and the coverage per box to see the square feet to order, the boxes to buy and the cost.
EV vs gas cost calculator
Enter the miles you drive, the gas car's mpg and local gas price, and the EV's efficiency and your electricity rate, to see the cost per mile for each and the saving.
Health
All health calculatorsBMI calculator
Enter your height and weight to get your BMI, the category it falls in, and the weight range considered healthy for your height.
TDEE calculator
Enter your details and activity level to see how many calories you burn in a day and where to set intake for slow, steady weight change.
Calorie deficit calculator
Enter where you are, where you want to be and the daily deficit you'll run to see the weekly rate, the number of weeks and the date you'd reach the goal.
Macro calculator
Enter your daily calories and pick a split, or set your own percentages, to see how many grams of protein, carbs and fat that comes to each day.
Running pace calculator
Enter how far you ran and how long it took to see your pace per mile and per kilometre, your speed, and the finish times that pace produces at race distances.
Body fat calculator
Enter your height, neck and waist (and hips for women) to estimate body fat percentage with the US Navy formula, and see your fat and lean mass.
Guides
All guideseBay fees explained: what a sale really costs in 2026
The final value fee, the per-order fee, the $7,500 tier, promoted listings and the international fee, worked through on real sales so you can see where the money goes.
Etsy fees explained: listing, transaction, processing and Offsite Ads
Four separate fees add up to more than most sellers expect. What each one is, what it's charged on, and a worked example on a $35 order.
BMI and daily calories: what the numbers mean and where they break down
How BMI and total daily energy expenditure are calculated, what the categories and activity multipliers actually say, and the situations where each number is wrong.
How CalcRabbit works
Every calculator here is built the same way. The page ships with the answer already worked out for a typical case, then recalculates as you type. Money is never a floating-point number, so the cents come out the way a platform bills them. Fee schedules and tax tables carry an effective date and a link to the source, and the same numbers are run through two independent implementations before anything is published.
Underneath each calculator you'll find how to use it, a worked example with real numbers, the formula, the sources, and the questions people actually ask. More about the site, or tell us if a rate has changed.