Biology Calculators
Free online biology calculators for pregnancy tracking, metabolism, and more.
Pregnancy Due Date
Calculate estimated due date, gestational age, and milestones.
BMR Calculator
Calculate Basal Metabolic Rate using Mifflin-St Jeor.
Herd Immunity Threshold
Calculate vaccination coverage needed for herd immunity.
Drug Half-Life
Calculate elimination half-life and rate constant.
qPCR ΔΔCt
Relative gene expression using comparative Ct method.
Sensitivity & Specificity
Calculate diagnostic test performance metrics.
Relative Risk & OR
Calculate RR, OR, and attributable risk.
ELISA Titer
Calculate S/CO ratio and estimate antibody titer.
Hemocytometer Count
Cell concentration and viability from hemocytometer.
Seeding Density
Calculate cell suspension volume for plating.
FCR Calculator
Feed conversion ratio for aquaculture.
Water Quality Index
Calculate simplified water quality index.
Degree-Day (GDD)
Growing degree days for plant/insect development.
Incidence & Prevalence
Calculate disease prevalence and incidence rate.
Restriction Digest
Calculate enzyme volume for DNA digest.
Viral Titer (PFU/mL)
Calculate viral titer from plaque assay.
Creatinine Clearance
Cockcroft-Gault equation for renal function.
DO Saturation
Calculate dissolved oxygen saturation.
Pielou's Evenness
Calculate species evenness from Shannon diversity.
Salinity Converter
Convert conductivity to practical salinity.
Body Condition Index
Estimate body condition from weight and length.
Coral Calcification
Calculate coral calcification rate.
Pregnancy Due Date Calculator
Calculate estimated due date and current gestational age
Due Date
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Gestational Age
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Trimester
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Days Until Due
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BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation
BMR (calories/day)
1,686
Sedentary
2,023
Light Exercise
2,319
Moderate Exercise
2,614
2,910
3,205
Save Configuration Snapshot
Save current parameters to your dashboard for instant one-click reloading.
About This Calculator & Guide
About the Biologys — 90+ Free Online Tools Calculator
The Biologys — 90+ Free Online Tools Calculator is a specialized online utility designed to help you free online biology calculators — genetics, ecology, physiology, biochemistry, microbiology, virology, immunology, pharmacology, epidemiology, cell biology, marine biology, and more. It performs calculations in real-time to provide immediate, reliable estimates for study, work, or daily tasks.
How to Use
Simply enter your parameters in the input fields of the calculator widget above. The tool evaluates the inputs instantly and displays the results in real-time. You can modify any value to check alternate scenarios and compare figures dynamically.
Data Privacy & Safety
All calculations are executed locally within your web browser. No inputs are sent to our servers or stored externally, ensuring your personal and financial details remain completely private and secure.
FAQ
Frequently Asked Questions
What does the Biology Calculators — 90+ Free Online Tools do?+
Free online biology calculators — genetics, ecology, physiology, biochemistry, microbiology, virology, immunology, pharmacology, epidemiology, cell biology, marine biology, and more. It is designed for quick everyday use and gives clear results without requiring a sign in.
Is the Biology Calculators — 90+ Free Online Tools free to use?+
Yes. The Biology Calculators — 90+ Free Online Tools is free to use online and works directly in your browser.
Can I use the Biology Calculators — 90+ Free Online Tools on mobile?+
Yes. The calculator layout is responsive, so you can use it on phones, tablets, laptops, and desktop screens.