Convert Files. Crunch Business Numbers. All Free.
Free online calculators, business tools, AI economy analyzers, and file converters. Everything runs in your browser — no uploads, no accounts.
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Popular Tools
The most-used tools across music, payroll, tax, and AI.
MIDI to MusicXML Converter
Convert .mid and .midi files into editable MusicXML sheet music for MuseScore, Finale, Sibelius, Dorico, and other score editors. Detects tempo, measures, notes, and chords in your browser.
Paycheck Calculator
Estimate take-home pay after federal taxes, state taxes, and payroll deductions for hourly or salary income.
US Self-Employment Tax Calculator
Calculate your US self-employment tax (Social Security + Medicare) based on your net earnings, including the 92.35% taxable base and deductible half.
AI vs Human Cost Calculator
Compare the cost of completing a task with AI tools versus hiring a human. Includes API costs, time savings, and ROI.
Categories
Pick a category to find the tool you need.
Tax Calculators
Income tax, self-employment tax, sales tax, and more for individuals and businesses.
33 toolsPayroll Calculators
Paycheck estimators, employer cost calculators, and overtime tools.
24 toolsPricing Calculators
Markup, margin, hourly rate, and project pricing tools.
13 toolsBusiness Planning
Break-even analysis, startup cost estimators, and ROI calculators.
23 toolsFreelancer Tools
Rate calculators, invoice generators, and time tracking tools for freelancers.
9 toolsE-Commerce Calculators
FBA fees, shipping cost, profit margin, and dropshipping calculators.
10 toolsReal Estate Calculators
Mortgage, rental yield, property tax, and closing cost calculators.
10 toolsAI Economy Tools
AI cost calculators, ROI tools, and job impact analyzers.
22 toolsTopic Hubs
Curated multi-step tool paths for complete workflows.
Music Notation and Choir Hub
Convert MIDI, MusicXML, and ABC notation, create printable score previews and practice audio, and check choir ranges when needed.
Tax and Payroll Optimization Hub
Paycheck, withholding, tax planning, and reimbursement workflows for recurring money operations.
Business and AI Economics Hub
Cost, ROI, and automation decision workflows for AI adoption and growth planning.
Conversion and Data Pipelines Hub
High-demand document, media, and data conversion flows for repeat utility usage.
Newest Tools
Recently published tools.
AI Photo to 3D Model Generator
Transform any photo into an interactive 3D model using AI depth estimation — runs entirely in your browser. Export as STL for 3D printing, OBJ for Blender, or GLB for the web.
DNA/RNA Base Pair Converter
Convert DNA sequences to complementary DNA, mRNA, tRNA anticodons, and amino acid chains. See codon-by-codon breakdown with GC content and base composition.
Punnett Square Generator
Generate Punnett squares for monohybrid and dihybrid crosses. See genotype and phenotype ratios with a visual grid and probability bars.
Hardy-Weinberg Equilibrium Calculator
Calculate allele and genotype frequencies using the Hardy-Weinberg equation. Supports allele frequencies, phenotype counts, and genotype counts with chi-square equilibrium testing.
Browse by Country
Tax, payroll, and business tools tailored to your country.