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Tiny Tools.
Big Answers.

Free calculators and utility tools for math, finance, health, and everyday problem-solving. From churn rate to breast cancer risk to cooking conversions — if there’s a number to compute, we have a tool for it.

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Most Used This Month

Our highest-traffic tools — tested and maintained

AVG
Average Calculator
Mean, median, mode — all in one
DER
Derivative Calculator
Step-by-step derivative solver
BE
Break-Even Analysis
Units & revenue to hit breakeven
BMI
Child BMI Calculator
Age-adjusted BMI percentiles
CR
Churn Rate Calculator
Customer retention metrics
X²
Chi-Square Calculator
Goodness of fit & independence
DS
Debt Snowball Calculator
Payoff plan by smallest balance
FG
Final Exam Grade
What score do you need?
CV
Cooking Converter
Cups, grams, oz — instantly
BCR
Breast Cancer Risk
Gail model risk estimate

Who Uses TinyTool

Practical tools for real work

Students & Researchers

From chi-square tests to derivative solving and final exam grade tracking — get the math right without wrestling with a graphing calculator.

Finance & Business

Calculate breakeven points, model debt payoff schedules, or figure out mortgage interest. Our finance tools are built on standard formulas — no black boxes.

Health & Everyday Life

Track child BMI percentiles, estimate breast cancer risk, or convert cooking measurements. Calculations people actually need in daily life.

Browse by Category

All free, no account required

Math & Science

Math Average Calculator Mean, median, mode Math Derivative Calculator Step-by-step solving Stats Chi-Square Calculator Goodness of fit Math Inverse Trig Calculator arcsin, arccos, arctan Physics Center of Gravity Find the balance point Geometry Cylinder Volume V = πr²h Physics Drag Coefficient Aerodynamic drag Physics Downforce Calculator Aerodynamic downforce

Finance & Business

Business Break-Even Analysis Units to profitability Debt Debt Snowball Payoff by smallest balance SaaS Churn Rate Calculator Customer retention metrics Real Estate Mortgage Interest Interest portion of payment Finance Free Cash Flow (FCF) Operating cash flow minus capex Business Equipment Financing Lease vs buy equipment Finance Bridge Loan Calculator Short-term loan costs Business Budget Variance Actual vs planned budget

Health & Lifestyle

Health Child BMI Calculator Age-adjusted percentiles Health Breast Cancer Risk Gail model risk estimate Health GFR Calculator Glomerular filtration rate Fitness Army Body Fat Body fat % by army method Nutrition Keto Macro Calculator Macros for ketogenic diet Parenting Child Sleep Hours Recommended sleep by age Lifestyle Birthday Countdown Days until your birthday Parenting Baby Growth Calculator Track infant growth percentiles

Conversion & Utility

Cooking Cooking Converter Cups, grams, oz, tsp Cooking Kitchen Measurement Ingredient substitutions Education Final Exam Grade What score do you need? Outdoor Hiking Time Estimator Time based on distance & gain Gardening Greenhouse Area Surface area for ventilation Events Catering Cost Per Head Per-person catering budget Events Champagne Bottle Count How many bottles for guests Beverage Beer ABV Calculator Alcohol by volume

About TinyTool

TinyTool started with a simple frustration: why does finding a reliable, free calculator always involve navigating a maze of ads, paywalls, and broken tools? We decided to build the directory we wished existed — one where every tool actually works, the math is transparent, and you’re never asked to “upgrade to unlock.”

Every tool in our directory is manually reviewed before it’s listed. We check the formulas, test the edge cases, and verify it works without an account. If a tool breaks or goes behind a paywall, we remove it. No exceptions.

From statistical tests for graduate students to measurement conversions for home cooks — if there’s a number to compute, we want it to be free and accessible.

185+
Curated Tools
12
Categories
100%
Free to Use

Frequently Asked Questions

Most calculator directories are automated scrapes — they list tools without checking if they work. TinyTool is manually curated. Every tool is tested before it’s listed, and we remove tools that break or go behind a paywall. We also show the formula behind each calculation so you can verify the math yourself.
No. Every tool on TinyTool works without an account. We don’t collect your email, we don’t ask for a signup, and we don’t track your calculations. What you calculate is your business.
We accept submissions from tool creators and users. To be considered, a tool must meet our inclusion criteria: (1) the core functionality must be free to use, (2) it must work without requiring an account or credit card, (3) the calculations must be based on verifiable, standard formulas, and (4) it cannot be a duplicate of an existing listed tool. Submit your tool via our contact page — we review every submission and typically respond within 5 business days.
We use standard, peer-reviewed formulas for every tool. For medical calculators, we note the specific model used (e.g., the Gail model for breast cancer risk). That said, these tools are for informational purposes — always consult a qualified professional for medical, legal, or financial decisions.
We add new tools on a rolling basis, typically 8–12 per month. We prioritize tools that fill a genuine gap — not variations of what’s already listed. We also conduct a quarterly audit of all listed tools to ensure they’re still functional and free.