All calculators (210)
Science-backed health, fertility, finance and math calculators with transparent formulas, peer-reviewed references and instant results — free, private, no signup.
Free, science-backed calculators — transparent formulas, cited sources, no tracking of your inputs.
Money & Finance (47)
Loan, savings, investing and planning calculators using standard amortization mathematics, transparent assumptions and cited conventions.
Mortgage
- 🏠 Mortgage Calculator
- 📉 Amortization Calculator
- 🔑 Mortgage Affordability Calculator
- 🔄 Refinance Calculator
- 🏠 USA Mortgage Calculator
- 🏠 UK Mortgage Calculator
- 🏠 South Africa Bond Calculator
- 🏠 Australia Mortgage Calculator
- 🏠 Canada Mortgage Calculator
- 🏠 India Home Loan Calculator
- 🏠 Germany Mortgage Calculator
- 🏠 China Mortgage Calculator
- ⏸️ Interest-Only Mortgage Calculator
- 🎈 Balloon Mortgage Calculator
- 📆 Biweekly Mortgage Calculator
- 📊 ARM Calculator
- 🔽 Mortgage Points Calculator
- 🏗️ Construction Loan Calculator
- 🌉 Bridge Loan Calculator
Health (25)
Body composition, nutrition, pregnancy and heart-health calculators based on WHO, NHS, ACOG and ACSM reference standards.
Fitness (20)
Training calculators for runners, cyclists, swimmers and lifters — validated formulas from sports science literature.
Education & Math (57)
Math and statistics calculators with step-by-step formulas and worked examples for students and professionals.
Statistics
- μ Mean Calculator
- 𝑀 Median Calculator
- σ Standard Deviation Calculator
- 🎲 Probability Calculator
- 🧪 Sample Size Calculator
- 📏 Confidence Interval Calculator
- 𝑍 Z-Score Calculator
- 🔔 Normal Distribution Calculator
- 🎯 Binomial Distribution Calculator
- 🧾 T-Test Calculator
- χ² Chi-Square Test Calculator
- 📉 Correlation Calculator
- 🔄 Bayes' Theorem Calculator
Home Improvement (6)
Project estimation calculators with industry-typical coverage values you can adjust to your materials.
Construction (19)
Material quantity calculators using standard densities and coverage rates, with sensible waste margins.
Automotive (3)
Driving-cost and fitment calculators with metric and imperial unit conversions built in.
Technology (6)
Data, networking and number-system calculators for developers, admins and students.
Engineering (6)
Electrical and mechanical engineering calculators using standard physical constants, cited on every page.
Cooking & Baking (5)
Kitchen conversion calculators built on published ingredient densities and baker's percentages.
Everyday Tools (16)
Quick daily-life calculators: dates, times, travel budgets, tips and currency conversions.