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Popular calculators
The tools people use most
ROAS Calculator
Calculate your return on ad spend ratio and profitability.
Marketing
Depop Fee Calculator
Calculate Depop seller fees and net earnings.
Fees
Break Even Calculator
Find how many units to sell to cover all your costs.
Marketing
Click Through Rate Calculator
Calculate your CTR and compare it to industry benchmarks.
Marketing
Billable Hours Calculator
Calculate billable hours, effective rate, and utilization.
Freelance
Poshmark Fee Calculator
Calculate Poshmark commission and net earnings.
Fees
Fiverr Fee Calculator
Calculate Fiverr service fees and take-home pay.
Fees
StockX Fee Calculator
Calculate StockX seller fees and net payout.
Fees
Browse by category
9 categories, 64+ tools
Marketing · 14
ROAS, CTR, CPC, break-even, and campaign metrics
Home Costs · 6
Roofing, plumbing, renovation, and HVAC
Marketplace Fees · 9
Depop, Etsy, Mercari, Poshmark, and more
Accounting · 7
Depreciation, P&L, tax, and margins
HR · 6
PTO, salary, overtime, and employee costs
Freelance · 4
Billable hours, rates, and projections
Health · 5
Fasting, BMI, calories, and macros
Real Estate · 6
Commission, yield, and cap rate
Startup · 7
Cap table, dilution, burn rate, and runway
About CalculateMyStuff.com
A free collection of online calculators for business, finance, and everyday decisions. Every calculator runs in your browser, requires no signup, and explains the formula behind the result.
Our marketing calculators cover ROAS, CTR, break-even analysis, and customer acquisition cost. Marketplace fee calculators support Depop, Etsy, Mercari, Poshmark, StockX, Fiverr, StubHub, and Ticketmaster.
Accounting tools include MACRS and straight-line depreciation, P&L statements, and sales tax. Home cost estimators cover roofing, plumbing, renovation, and HVAC projects adjusted by state. We also build tools for HR, health, real estate, freelancers, and startups.