Body & Health Calculators
Track your BMI, BMR, body fat, ideal weight, and other key health metrics with our free calculators.
1 Rep Max Calculator
Estimate your one-rep max from any weight and rep count using five proven formulas
Use calculatorBMI Calculator
Calculate your Body Mass Index
Use calculatorBMR Calculator
Calculate your Basal Metabolic Rate
Use calculatorBody Fat Percentage
Estimate your body fat percentage
Use calculatorConception Date Calculator
Estimate your conception date and fertile window from due date or weeks pregnant
Use calculatorDays Pregnant Calculator
Convert pregnancy weeks to total days pregnant
Use calculatorDue Date Calculator
Estimate your due date and current pregnancy week from LMP or conception
Use calculatorHow Many Weeks Pregnant Am I Calculator
Calculate your current pregnancy week, trimester, month, and due date timeline
Use calculatorIdeal Weight Calculator
Find your ideal weight range
Use calculatorMass-Volume-Concentration Calculator
Solve for any variable in the concentration equation: C = m / V
Use calculatormg/mL Calculator
Calculate mg/mL concentration from mass in mg or mcg and volume in mL
Use calculatormL to Syringe Units Calculator
Convert mL to syringe scale units for U-100, U-40, and U-500 scales
Use calculatorPeptide Concentration Calculator
Calculate solution concentration (mg/mL) from mass and volume
Use calculatorPeptide Dilution Calculator
Calculate dilution using the C1V1 = C2V2 formula
Use calculatorPeptide Reconstitution Calculator
Calculate reconstitution concentration (mg/mL) and draw volume (mL) from vial mass and diluent volume. Shows step-by-step formulas. Math-only tool.
Use calculatorPeptide Unit Converter
Convert between mg, mcg, mL, and syringe units
Use calculatorPregnancy Countdown Calculator
Count down the days remaining until your due date
Use calculatorPregnancy Trimester Calculator
Calculate your current pregnancy trimester from weeks pregnant or due date
Use calculatorPregnancy Weeks to Months Calculator
Convert pregnancy weeks to the approximate month of pregnancy
Use calculatorSerial Dilution Calculator
Calculate concentration at each step of a serial dilution with chart and table
Use calculatorSolution Concentration Calculator
Calculate concentration from mass and solution volume in multiple units
Use calculatorSyringe Units Calculator
Convert concentration and amount to syringe units and mL
Use calculatorTarget Heart Rate
Calculate your target heart rate for exercise
Use calculatorBrowse Other Categories
Age & Time
Calculate your exact age, countdown to birthdays, find birth days, and explore time-based calculations.
Finance
Plan your retirement, calculate mortgage payments, convert salaries, and reach your savings goals faster.
Business
Profit margins, break-even analysis, markup, ROI, LTV, CPA, SaaS MRR, startup runway, and ecommerce profitability calculators.
Measurements & Conversions
Convert between temperature, weight, volume, cooking, and length units instantly.
Lifestyle & Daily Tools
Optimize your sleep, hydration, nutrition, and daily energy expenditure with science-backed calculators.
Home & DIY
Estimate paint, flooring, concrete, and wall coverage for your home improvement projects.
EMS & Medical
IV drip rate, medication dosage, weight-based dose, and pediatric reference calculators for EMT and paramedic exam prep.
YouTube Creator Tools
Revenue, monetization, growth, and workflow calculators for YouTube creators — from RPM estimators to YPP eligibility trackers.
Social Media & Influencer
Earnings estimators, rate calculators, UGC pricing, engagement benchmarks, and influencer ROI tools for creators and brands across TikTok, Instagram, and beyond.
Amazon Seller Tools
Free browser-side utilities for Amazon sellers — listing title cleaner, search term optimizer, bullet point formatter, variation builder, and CSV column mapper.
SEO Tools
Free browser-side SEO and marketing utilities — meta tag previews, schema markup generator, robots.txt builder, UTM link builder, SERP/OG previews, and SMS segment calculator.
File Converter Tools
Free browser-side file converters — convert between JPG, PNG, WebP, AVIF, PDF, and HEIC without uploading. All processing happens locally in your browser for complete privacy.
Facebook & Meta Ads
Free Facebook and Meta Ads calculators — ROAS, break-even ROAS, profit, CPA, CPM, CPC, CTR, and conversion rate tools for advertisers.
Human Resources
Free HR calculators for payroll, PTO accrual, true employee cost, turnover cost, FTE, absenteeism, pay raises, timesheets, and workforce planning.