⊞ All Tools
Finance & Health
Calculators
Browse all free tools — filtered to what actually matters. Finance and health calculators that explain results and tell you what to do next.
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Debt & Credit
6 tools❄️Popular
Debt Snowball Calculator
Plan payoff order, find your debt-free date, and calculate interest savings.
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💰Popular
Cashback Calculator
Calculate cash back rewards and compare credit card offer value.
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💳Finance
Credit Card Processing Fee Calculator
Calculate merchant processing fees and net revenue after card costs.
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⚖️Finance
Chapter 13 Payment Calculator
Estimate monthly Chapter 13 repayment plan amounts.
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📋Finance
Chapter 13 Bankruptcy Calculator
Estimate eligibility and plan structure for Chapter 13 reorganization.
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👶Finance
Child Support Calculator
Estimate monthly child support obligations from income and custody data.
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Mortgage & Real Estate
5 tools🏠Popular
Mortgage Payoff Calculator
Find your payoff date and total interest. Test extra payment scenarios.
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📅Popular
Biweekly Mortgage Calculator
See how biweekly payments cut your loan term and total interest paid.
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🏦Finance
HELOC Payment Calculator
Estimate monthly payments during draw and repayment periods.
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🔨Popular
House Flipping Calculator
Estimate profit, ROI, and break-even for a fix-and-flip property.
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🦷Finance
Dental Implant Cost Calculator
Estimate total implant costs including procedure, crown, and financing.
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Savings & Banking
5 tools📈Popular
CD Ladder Calculator
Build a CD ladder and project interest income across staggered maturity dates.
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🏧Finance
Money Market Account Calculator
Estimate interest earned over time with compound growth.
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📊Finance
Blended Interest Rate Calculator
Calculate the weighted average rate across multiple loans or accounts.
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📉Finance
Basis Points Calculator
Convert basis points to percentages and understand rate movements.
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🚗Finance
Car Scrap Value Calculator
Estimate your vehicle's scrap or salvage value before selling.
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Personal Finance
6 tools🏷️Popular
Discount Calculator
Find sale price, amount saved, and original price from any discount.
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Percentage Calculator
Calculate percentage of a number, percent change, increase, or decrease.
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📐Finance
Margin Calculator
Calculate gross profit margin, markup, and net revenue.
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🪙Finance
Cents to Dollars Calculator
Convert any amount in cents to dollars instantly.
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🛡️Finance
Insurance Rate per $1 Calculator
Normalize premium cost per dollar of coverage for easy quote comparison.
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📈Finance
Simple Rate of Return Calculator
Estimate a straightforward return percentage from gain, income, and costs.
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Business Metrics
12 tools🖱️Business
CTR Calculator
Calculate click-through rate from impressions and clicks.
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📈Business
Revenue Growth Rate Calculator
Calculate revenue growth rate between two periods.
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👷Business
Labor Cost Calculator
Estimate total labor cost including wages, benefits, and overhead.
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🏗️Business
Overhead Calculator
Estimate overhead cost rate and allocation across products or services.
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💼Popular
Accounting Rate of Return Calculator
Estimate ARR for capital projects from average profit and average investment.
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💾Business
Cost Savings Calculator
Quantify cost savings from process improvements or vendor changes.
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📒Business
Retained Earnings Calculator
Calculate ending retained earnings from opening balance, net income, and dividends.
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📊Business
EBITDA Calculator
Estimate earnings before interest, taxes, depreciation, and amortization.
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⚙️Business
Productivity per Employee Calculator
Measure revenue or output generated per employee headcount.
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💰Business
Payroll Budget Calculator
Estimate total payroll cost including salaries, taxes, and benefits.
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📦Business
Burden Rate Calculator
Calculate the true cost of an employee including all indirect costs.
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📦Business
Chargeable Weight Calculator
Calculate dimensional vs actual weight for freight billing.
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Body & Weight
3 tools🔥Popular
BMR Calculator
Calculate the calories your body burns at complete rest.
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⚕️Health
Breast Weight Calculator
Estimate breast tissue weight from bra size for medical and surgical planning.
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📏Health
More Body Calculators →
BMI, body fat %, ideal weight, lean body mass, and waist-to-hip ratio.
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Nutrition & Fitness
2 tools + more☕Popular
Caffeine Half-Life Calculator
See how long caffeine stays in your system — helpful for planning sleep.
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🫀Clinical
Cardiac Output Calculator
Calculate cardiac output from stroke volume and heart rate.
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🧍Clinical
Berg Balance Scale Calculator
Score fall risk in elderly or post-stroke patients for clinical rehab.
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🩺Health
All Health Tools →
Calorie deficit, macros, TDEE, water intake, heart rate zones, and more.
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About these tools
GentoolLab focuses on two areas where calculators actually change decisions: personal finance and health. Finance tools cover debt payoff, mortgage planning, savings, and business metrics. Health tools cover body composition, nutrition, fitness, and clinical reference.
Every tool explains what the result means — not just the raw number. All tools are free and require no signup.
Browse by category
Finance Calculators — debt, mortgage, savings, personal finance, and business metrics.
Health Calculators — body, fitness, nutrition, and clinical reference tools.