Calculators
Free online calculators for finance, health, math, and everyday life. BMI, compound interest, loan payments, retirement planning, scientific calculations, and more — all instant and private.
ToolStand's calculator collection covers finance (compound interest, loans, retirement, savings, DCA), health (BMI, body fat, calorie/TDEE, keto, water intake), math (scientific, function plotter), and everyday needs (tips, age, dates, aspect ratios). All calculators process data client-side — no personal information leaves the browser. Key tools: Compound Interest Calculator with interactive charts, BMI Calculator with weight classification, Retirement Calculator with 4% rule and inflation adjustment.
A Calculator for Every Need
ToolStand offers a comprehensive collection of free calculators covering finance, health, math, and practical everyday needs. Each calculator is designed for a specific purpose — no bloated interfaces, no unnecessary features, just the calculation you need with instant results. All calculators process data client-side, ensuring your personal information never leaves your device.
Finance Calculators
Make informed financial decisions with calculators for compound interest, loan payments, retirement planning, savings projections, investment analysis, and more. See how compound interest grows your money over decades, calculate monthly mortgage payments with full amortization schedules, estimate your retirement fund and sustainable withdrawal rate, and understand the true cost of borrowing. Each calculator includes interactive charts that visualize your financial future.
Health Calculators
Track and understand your health metrics with BMI, body fat percentage, calorie and TDEE, keto macros, water intake, and pace calculators. These tools use established formulas (Mifflin-St Jeor for BMR, US Navy method for body fat) to provide science-backed estimates. No health data is stored or transmitted — everything stays in your browser.
How to Choose the Right Calculator
Finance and Investment
| Goal | Best Tool | Why |
|---|---|---|
| Project lump sum growth | Compound Interest | Fixed rate, interactive balance chart |
| Plan recurring savings | Savings Calculator | Monthly contributions, future value |
| Plan retirement | Retirement Calculator | Age, savings, 4% rule, inflation |
| Analyze a loan | Loan and Mortgage | Amortization schedule, extra payments |
| See inflation impact | Inflation Calculator | Purchasing power over time |
| Track DCA cost basis | DCA Calculator | Weighted average across buys |
| Model dividend growth | Dividend (DRIP) | Reinvested dividends + tax rate |
| Size a trade | Trade Risk Calculator | Position size from stop-loss |
| Split a bill | Tip Calculator | Quick percentage + split |
Health and Fitness
| Goal | Best Tool | Why |
|---|---|---|
| Weight check | BMI Calculator | WHO classification, metric/imperial |
| Body composition | Body Fat Calculator | US Navy formula, gender-specific |
| Daily calories | Calorie and TDEE | Mifflin-St Jeor BMR + activity |
| Keto macros | Keto and Macro | Custom fat/protein/carb ratios |
| Hydration | Water Intake | Weight + activity based |
| Running pace | Pace Calculator | Splits, finish time projection |
Everyday and Math
| Goal | Best Tool | Why |
|---|---|---|
| Scientific math | Scientific Calculator | Trig, log, powers, history |
| Graph functions | Function Plotter | Visualize f(x), zoom, pan |
| Screen DPI | DPI and PPI Calculator | Resolution math for screens/print |
| Exact age | Age Calculator | Years, months, days |
| Days between dates | Date Difference | Calendar date math |
| Image/video ratio | Aspect Ratio | YouTube, Instagram, TikTok presets |
All calculators work independently. Results are mathematical estimates, not financial or medical advice.
All Calculators on ToolStand
- BMI Calculator — Body Mass Index with weight category classification. No health data stored.
- Body Fat Calculator — US Navy body fat percentage formula with gender-specific measurements.
- Calorie & TDEE Calculator — Daily calorie needs and macro targets using Mifflin-St Jeor BMR formula.
- Keto & Macro Calculator — Keto-specific macro targets with BMR, TDEE, and doughnut chart visualization.
- Water Intake Calculator — Daily water needs based on weight, activity, and climate.
- Pace & Running Calculator — Calculate pace, time, or distance with race splits for 5K through marathon.
- Compound Interest Calculator — Visualize compound growth with interactive charts and contribution tracking.
- Loan & Mortgage Calculator — Monthly payments, amortization schedules, and early payoff simulations.
- Retirement Calculator — Estimate retirement fund and income with the 4% rule and inflation adjustment.
- Savings Calculator — Future value of savings with compound growth and Chart.js visualization.
- Inflation Calculator — See how inflation erodes purchasing power over time.
- Dividend Reinvestment Calculator — Calculate returns with dividend reinvestment and tax considerations.
- DCA Calculator — Dollar Cost Averaging with weighted average cost across multiple purchases.
- Trade Risk Calculator — Break-even price with commission. BIST and Binance presets.
- Tip Calculator — Calculate tips and split bills. Works worldwide with any percentage.
- Scientific Calculator — Trigonometry, logarithms, powers, and roots with expression history.
- Function Graph Plotter — Graph mathematical functions interactively with multi-function support.
- DPI & PPI Calculator — Calculate screen pixel density for monitors, phones, and print.
- Age Calculator — Calculate exact age in years, months, and days between dates.
- Date Difference Calculator — Days, weeks, business days between any two dates.
- Aspect Ratio Calculator — Calculate aspect ratios with YouTube, Instagram, and TikTok presets.
Frequently Asked Questions
What's the difference between the Compound Interest and Savings Calculator?
The Compound Interest Calculator models growth with a fixed interest rate. The Savings Calculator adds regular monthly contributions — use Compound Interest for one-time investments, Savings for ongoing contribution goals. Both show interactive Chart.js graphs of your balance over time.
Which calculator should I use for retirement planning?
Start with the Retirement Calculator — it factors in age, savings, contributions, and expected return. Pair with the Inflation Calculator to see purchasing power loss. For dividend investors, the Dividend Reinvestment (DRIP) Calculator models yield compounding. For dollar-cost averaging, the DCA Calculator tracks average cost basis.
How accurate are the BMI and Body Fat calculators?
The BMI Calculator uses the WHO standard formula and official categories (underweight 18.5, normal 18.5-24.9, overweight 25-29.9, obese 30+). The Body Fat Calculator uses the US Navy method — validated for general estimates but not a DEXA replacement. The Calorie and TDEE Calculator uses the Mifflin-St Jeor equation, the most accurate BMR formula per the Academy of Nutrition and Dietetics.
Can the Loan Calculator handle mortgage calculations?
Yes. The Loan and Mortgage Calculator works for any amortized loan — mortgage, auto, personal, or student. It calculates monthly payments using the PMT formula and generates a full amortization schedule. Enable Extra Payment to see how additional payments reduce interest and shorten the term. For restaurant tips, use the Tip Calculator.
How do DCA, Dividend, and Trade Risk calculators differ?
DCA Calculator tracks average cost per share across purchases. Dividend (DRIP) Calculator compounds reinvested dividends with yield and tax rate. Trade Risk Calculator sizes positions based on account balance and stop-loss. Use DCA for cost tracking, DRIP for dividend growth, Trade Risk for position sizing.
Are my calculations private and do they work offline?
Yes. All math — compound interest, BMI, PMT amortization, TDEE — runs in your browser. No data is sent to any server. Health measurements and financial inputs stay on your device. Many calculators work offline after the first visit. BMI, Loan, and Compound Interest support embedding via iframe.