Ovulation Calculator – Fertile Days & Next Period
Estimate ovulation day and fertile window from your last period date and cycle length. Educational calendar — not medical advice.
h/tools · Free Tools
Free calculators, converters, PDF, image, video and AI tools that run in your browser.
Ideal Weight Calculator – Healthy Weight by Height
Estimate ideal body weight from height using Devine, Robinson and Miller formulas for adults. Compare with BMI ranges — educational only.
Simple Interest Calculator – Formula & Total Amount
Calculate simple interest and total amount with I = P × r × t. Free simple interest calculator for loans and short-term savings examples.
Running Pace Calculator – Free Pace, Time & Distance
Free running pace calculator: find pace per km or mile, finish time, or distance from any two inputs. Ideal for 5K, 10K, half and marathon…
Break-Even Calculator – Free Units & Sales Target
Free break-even calculator: find how many units or how much revenue you need to cover fixed and variable costs. Clear contribution margin…
UTM Builder – Free Campaign URL & UTM Link Generator
Build clean UTM tracking links for Google Analytics and ads. Add source, medium, campaign, term and content, then copy a ready URL. Free,…
robots.txt Generator – Free robots.txt File Maker
Generate a robots.txt file with allow/disallow rules, crawl-delay notes and sitemap URL. Copy or download. Free SEO helper for any site.
Refinance Calculator – Mortgage Refinance Savings & Break-Even
Free mortgage refinance calculator: compare your current loan with a new rate, estimate the new payment, monthly savings and months to…
Time Calculator – Add & Subtract Hours, Minutes, Seconds
Free time calculator to add or subtract hours, minutes and seconds, or find the duration between two clock times. Great for schedules,…
Rounding Calculator – Round to Nearest Tenth, Whole, Significant Figures
Free rounding calculator: round to the nearest whole number, tenth, hundredth, thousandth or any decimal place, plus significant figures.…
cm to Inches Converter – Centimeters to Inches
Convert centimeters to inches instantly. Free on-device cm to in calculator with a full unit table. Exact factor: 1 in = 2.54 cm.
Inches to cm Converter – Inches to Centimeters
Convert inches to centimeters instantly. Free on-device in to cm calculator. Exact factor: multiply inches by 2.54. inches to cm converter…
kg to lbs Converter – Kilograms to Pounds
Convert kilograms to pounds instantly. Free on-device kg to lbs calculator for weight, luggage and fitness. kg to lbs converter kilograms…
lbs to kg Converter – Pounds to Kilograms
Convert pounds to kilograms instantly. Free on-device lbs to kg calculator for weight and travel. lbs to kg converter pounds to kilograms
Celsius to Fahrenheit Converter (°C to °F)
Convert Celsius to Fahrenheit instantly. Free °C to °F calculator with Kelvin too. Formula: °F = °C × 9/5 + 32. celsius to fahrenheit…
Fahrenheit to Celsius Converter (°F to °C)
Convert Fahrenheit to Celsius instantly. Free °F to °C calculator. Formula: °C = (°F − 32) × 5/9. fahrenheit to celsius converter F to C
km to Miles Converter – Kilometers to Miles
Convert kilometers to miles instantly. Free on-device km to miles calculator for travel and running. km to miles converter kilometers to…
Miles to km Converter – Miles to Kilometers
Convert miles to kilometers instantly. Free on-device miles to km calculator. 1 mile = 1.609344 km. miles to km converter miles to…
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