ZeonTools
17+ Free Tools — 100% Browser-Side
Free Online
Calculators
Every calculator runs instantly in your browser. Zero data uploaded, zero server round-trips — just fast, accurate results.
17
Free
Calculators
Calculators
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24
Category
Hubs
Hubs
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Hub Pages
Browse by Category Hub
24 hubs
Hub
Mortgage & Real Estate
14-in-1 mortgage & real estate suite: PITI, Closing Costs, Rental ROI, Fix & Flip, BRRRR, Refinance, HELOC, Affordability, Rent vs Buy, FHA/VA, Stamp Duty (AU) & SBI EMI (IN).
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Business & Commercial
12 free business calculators: gross margin & markup, break-even, business valuation, DSCR, LTV:CAC, salary converter, overtime (US/CA), commercial loan, depreciation, commission & freelancer rate.
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Investment & ROI
10 free investment & ROI calculators: compound interest, IRR, PV/FV, FIRE, Roth vs Traditional IRA, Rule of 72, RMD, pension income, budget planner & SIP.
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Currency & Crypto Calculators
Convert 160+ fiat currencies and 10,000+ crypto assets in real-time. Features 12+ free tools including a live converter, travel budget planner, DeFi impermanent loss, and hidden fee analyzer.
Hub
Auto Loan & Lease
The most advanced auto finance toolkit. Compare lease vs. buy scenarios, calculate monthly payments, generate complete amortization schedules with extra payments, and model vehicle depreciation over time. 100% free and client-side.
Hub
Wealth & Net Worth
The definitive toolkit for wealth building. Track your exact Net Worth, calculate your FIRE (Financial Independence) number, model compound interest, compute bond yields to maturity, and analyze capital gains tax impact. 100% free and private.
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Math & Science
The most complete free math & science toolkit: scientific calculator with all trig/log functions & constants, 4x4 matrix algebra, descriptive & probability statistics, geometry solver for 15+ shapes, scientific notation converter, fraction arithmetic, physics formulas for mechanics/energy/waves, percentage & ratio tools. All client-side — no data leaves your browser.
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Fitness & Health
Free TDEE & Macro Calculator Hub: TDEE, BMR, macro splits (Keto/Low-Carb/Balanced), BMI, body fat % (Navy), 1RM, Karvonen heart rate zones, run pace, sleep cycles.
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Developer & IT
Free dev toolkit: JSON formatter, Base64 encoder/decoder, JWT decoder, password generator (crypto.getRandomValues), UUID v4, MD5/SHA-256/SHA-512 hash generator, IPv4/CIDR subnet calculator, number base converter, regex tester, cron builder.
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Startup & MRR
10 free startup tools: MRR/ARR projections, startup valuation, SAFE dilution, cap table, burn rate & runway, LTV:CAC, cohort churn & NRR, Rule of 40, ESOP pool & VC round dilution. Zero signup.
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DIY & Construction
10 free DIY tools: concrete, lumber, paint, tile, roofing, drywall, framing, deck, fence & mulch calculators. Waste-factor included. No signup.
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Medical & Clinical Calculators
10 free clinical tools: BMI, BMR, eGFR, BSA, QTc, IV drip, MAP, due date, pregnancy weight & BAC. Evidence-based, privacy-first.
Hub
Time & Date Calculators
10 free time & date tools: days between dates, age, add/subtract, countdown, world clock, timezone converter, Unix timestamp, business days, work hours & week number.
Hub
Salary & Tax Calculators
10 free salary & tax tools: take-home pay, income tax brackets, FICA calculator, capital gains tax, 401(k) projector, bonus tax & salary converter with 2026 rates.
Hub
LLM & AI Calculators
10 free AI & LLM tools: VRAM calculator, token cost estimator, quantization comparison, KV cache, GPU batch size, inference latency, RAG cost, embedding cost, fine-tuning compute & AI ROI.
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ESG & Carbon
Carbon tariff, CBAM, net-zero & ESG offsets.
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Solar & Smart Home
Solar ROI, EV charger, heat pump & battery arbitrage.
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Social Media & Creators
Sponsorship ROAS, burnout velocity & creator income.
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Gaming & eSports
eDPI, Genshin pity, PC bottleneck & microtransactions.
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Education & School
GPA, student loans, attendance & academic tools.
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Engineering & Weather
Apparent temp, ideal gas law & engineering tools.
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Industrial Engineering
OEE, hardware BOM, immersion cooling & manufacturing.
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Edge & Spatial Computing
Edge latency, spatial bandwidth, CV inferencing & IoT.
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Chemistry & Science
Molarity, half-life, radioactive decay & lab tools.
All Calculators
All 17 Calculators
Sort by categoryFinancial & Real Estate
17 calculators
Business Valuation Calculator
Selling your business? Calculate your company's true enterprise value using Wall Street-grade EBITDA multiples.
Car Affordability Calculator
Determine exactly how much car you can afford based on your salary, monthly budget, and down payment.
Car Depreciation Calculator
Calculate how much value your new or used car will lose over time and estimate its future resale value.
Car Loan Payment Calculator
Avoid dealership markup surprises. Calculate your true out-the-door auto loan payment including taxes and trade-ins.
EV vs Gas Savings Calculator
Compare the true cost of ownership between Electric Vehicles and Gas Cars, including charging costs, tax credits, and winter range penalties.
Impermanent Loss Calculator
Don't provide liquidity blindly. Simulate price divergences to see how much impermanent loss you will suffer in DeFi AMMs.
Lease vs Buy Car Calculator
Stop guessing. Mathematically prove whether leasing or financing is cheaper for your specific vehicle and driving habits.
Retail Margin & Markup Calculator
Optimize your retail pricing strategy. Calculate the exact difference between Markup percentage and Profit Margin percentage.
Balance Sheet Ratio Calculator
Is your business financially healthy? Calculate key liquidity, solvency, and profitability ratios instantly.
Business Break-Even Calculator
Find out exactly how many products you need to sell to stop losing money and start turning a profit.
Crypto Arbitrage Matrix
Spot a price difference across exchanges? Calculate your exact arbitrage profit after trading and withdrawal fees.
Crypto Exchange Fee Analyzer
Calculate the exact hidden costs of your crypto trades, including bid-ask spreads and tiered Maker/Taker fees.
Crypto Gas Fee Calculator
Never get stuck with insufficient funds. Calculate exact network gas fees in USD before executing your blockchain transactions.
Crypto Profit & Loss Calculator
Find out exactly how much profit you made after hidden exchange fees and spread costs.
Fiat Currency Converter
Get the true mid-market exchange rate without bank markups. Convert any global currency instantly.
Fiat Inflation Calculator
Inflation is a hidden tax. Calculate exactly how much purchasing power your cash savings will lose over time.
Tire Size & Speedometer Calculator
Compare tire sizes and see exactly how changing your tire dimensions will affect your speedometer reading.
