Safety validated. clinically reviewed.

Clinical calculators that save you time.

CRI dosing, sodium correction, potassium, phosphorus, nutrition & more. Free to start, Pro for the full toolkit. No subscriptions.

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Dose validated

CRI Calculator Norepinephrine 1 mg/mL

Patient Weight22.0 kg

Dose Rate0.2 mcg/kg/min

Dilution2 mL to 18 mL saline

Infusion Rate

2.64 mL/hr

25+

CRI Drug Profiles

Calculator Modules

16+

Enteral Diet Products

24/7

Emergency Ready

Calculator Modules

Everything you need at the vetside

Eight clinical calculators covering the maths that slows you down. All core tools free — Pro unlocks the specialist modules.

CRI Calculator

25 drugs with product concentrations, dilution guides, dose range sliders, and printable syringe labels. Select a drug, enter weight, choose dilution — get instant min/max infusion rates in mL/hr.

6 drugs free

Sodium Correction

5-step Adrogue-Madias workflow. Compares four fluid options, calculates safe correction rate with overcorrection warnings.

Pro

Phosphorous Infusion

5-step calculator with product dilution, bag size, peripheral vs central line concentration safety check.

Pro

Potassium Supplementation

Sliding scale lookup with KCl dilution, bag size selection, and maximum safe infusion rate check.

Free

Solutions Converter

Dextrose presets and custom C1V1=C2V2 mode with any units. Calculates exact draw-up and diluent volumes.

Free

Parenteral Nutrition

CPN/PPN formulation with configurable stock products, osmolarity validation, and gradual increase infusion schedule.

Pro

Enteral Nutrition

Energy requirement calculator with a database of 16 enteral diet products. Accounts for feeding route, water for blending, slurry moisture, and daily water requirement. Generates a gradual introduction feeding plan.

Free

Safety

Zero-compromise clinical safety

Every calculation runs through validation checks before displaying a result.

Physiological Range Checks

Inputs outside normal ranges, increased gastric capacity and fluid rate limit alerts shown instantly

Real-time Safety Ceilings

Automatic safety limits and administration line warnings for high-alert medications and infusions.

Osmolarity Validation

PN formulations and drugs checked against peripheral and central line concentration limits.

Correction Rate Limits

Automatic warnings of rate limits, integrated sodium correction rate limits, gastric capacity warnings and much more.

> INITIALIZING DOSAGE ENGINE…

> CROSS-REFERENCING CANINE DATABASE

VALIDATING DOSE ████████████████ 100%

> DRUG: Fentanyl

> DOSE: 5.0 mcg/kg/hr

> TOTAL VOLUME: 2.2 mL/hr

STATUS: SAFE FOR ADMINISTRATION

> MAX RATE CHECK: PASSED

> CEILING CHECK: PASSED

Dose validated

CRI Calculator Fentanyl

Patient Weight22.0 kg

Dose Rate5.0 mcg/kg/hr

Dilution250 mcg / 50 mL

Infusion Rate

2.2 mL/hr

Parenteral Nutrition Pro

Weight15 kg

RouteCentral (CPN)

Protein / Fat / Dex25 / 50 / 25%

Osmolarity1,180 mOsm/L

RER 534 kcal/day

Total Volume 482 mL/day

Infusion Rate 20.1 mL/hr

Below 1400 mOsm/L limit

Gradual plan

Feeding Schedule Recovery Liquid

Day	% RER	mL/meal	Containers	Water
1	25	24.6	1 bottle	661
2	50	49.2	1 bottle	579
3	75	73.8	2 bottles	497
4	100	98.4	2 bottles	416

Gastric capacity warning at Day 3+

Potassium Supplementation Free

Weight8.5 kg

Serum K+2.8 mEq/L

Add to each litre40 mEq/L

Bag Size250 mL

KCl to add 5 mL

Max safe fluid rate 106 mL/hr

Below 0.5 mEq/kg/hr limit

Safe rate

Sodium Correction Pro

Patient Na+128 mEq/L

Target Na+140 mEq/L

Weight22 kg

Selected Fluid0.9% NaCl

Volume Needed 6,557 mL

Infusion Rate 273 mL/hr

Correction Time 24 hrs

Solution Maker Free

Stock Concentration50% Dextrose

Target Concentration5%

Bag Size500 mL

Draw up from stock 50 mL

Add diluent 450 mL

Built by an ECC Specialist

Built with care for for vet professionals

We built VetCalculate because we needed it ourselves. Every algorithm is cross-checked against multiple textbook authorities. We don’t just provide a number — we provide a validated clinical trajectory.

Product-ready calculators with instant calculations as you enter values. You can also modify your own product concentrations or access a searchable global database of diet products and PN components. No brand lock-in. One-time pricing in a market saturated with subscriptions.

Pricing

Choose your plan

Core calculators free forever. Pro unlocks the full drug library, specialist modules & exports.

Free Plan

All essential clinical calculators — get started right away.

$0

forever

Essential CRIs (Fentanyl, Ketamine, Lidocaine, Midazolam, Propofol, Dexmedetomidine)

Potassium Supplementation

Nutrition (RER) Calculator

Solutions Maker & Unit Converter

PDF discharge sheets & CRI label export

Sodium/Phosphorous correction

Parenteral Nutrition

Calculation history

Start free

Pro Plan

Pay once, yours forever. Full drug library, all modules & history.

$79

$49

one-time payment

Everything in Free

All 25+ CRI drugs (vasopressors, opioids, sedatives & more)

Sodium Correction (hypo- and hyper-natremia)

Phosphorus Infusion

Parenteral Nutrition

PDF discharge sheets (all modules)

30-day calculation history

Lifetime updates

Unlock Pro — $49

Secure payments via DodoPayments · One-time payment — no recurring charges

Core calculators always free — we never gate clinical safety

Frequently Asked Questions

Quick answers to common questions about VetCalculate.

Is VetCalculate really free?

Yes. Six CRI drugs, potassium supplementation, the nutrition calculator, solution maker, and unit converter are completely free with no card info required. Pro ($49 one-time) unlocks the full 25-drug CRI library, sodium correction, phosphorus infusion, parenteral nutrition, and 30-day calculation history.

What does Pro include?

Pro unlocks all 25+ CRI drugs (including vasopressors, sedatives, and specialist agents), sodium correction, phosphorus infusion, parenteral nutrition formulation, PDF exports, and 30-day calculation history — all with lifetime updates.

Is this a subscription?

No. VetCalculate Pro is a one-time payment of $49. You pay once and it’s yours forever, including all future updates. No recurring charges, no annual renewal.

Who built this?

VetCalculate was built by Hamsini Yagneswar, a board-certified diplomate in emergency/critica care. With over a decade of experience in emergency and critical care across the US, UK, and India, this was built for clinical practice in a wide range of resource settings and for use by teams under pressure. This tool was built with safety as the highest priority. Every algorithm is cross-checked against multiple textbook authorities and developed in collaboration with nurses and specialists in anesthesia and critical care.

Can my whole practice use it?

The free tier is available to everyone with a login account. If you are sharing an account, make sure you only share your password with people whom you trust. Change your password regularly. Pro is per-account, but team pricing for practices is on our roadmap. Contact us at team@spawtlight.com for multi-seat enquiries.

Can I get customized tools?

Yes absolutely. We’re happy to white-label the platform – you’ll never see our branding. If you’d like pre-configured inputs, favorites, or data-sync with your patient management software, please get in touch with us at team@spawtlight.com.

Start free. Upgrade when you need more.

Handover the maths. Keep clinical control.

Get safe doses in seconds. Double check your calculations in real-time. Print instructions for the team*. Focus on your patient.

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